Journal of Rare Earths最新文献

{"title":"Influence of minor cerium addition on microstructure and fluidity of as-cast Al-Cu-Mn-Mg alloy","authors":"Yishan Wang ,&nbsp;Yu Bai ,&nbsp;Kaixi Jiang ,&nbsp;Wenxue Fan ,&nbsp;Puxuan Wang ,&nbsp;Hai Hao","doi":"10.1016/j.jre.2024.04.020","DOIUrl":"10.1016/j.jre.2024.04.020","url":null,"abstract":"<div><div>Al-Cu-Mn alloys are widely used to produce automobile components like cylinder heads and engine blocks because of their capability to retain excellent thermal and mechanical characteristics at high temperatures. However, the Al-Cu-Mn-based alloys demonstrate restricted fluidity, leading to casting defects such as shrinkage and incomplete filling. This research investigated the microstructure and fluidity of Al-4.7Cu-1.0Mn-0.5Mg (wt%) alloy with minor cerium (Ce) addition. The as-cast alloys predominantly comprise <em>α</em>-Al matrix, accompanied by the presence of Al₂Cu, Al₆Mn, and Al₈Cu₄Ce phases. The influence of adding Ce on the fluidity of the Al-4.7Cu-1.0Mn-0.5Mg alloy was investigated using a tri-spiral fluidity test mold in this research. The findings suggest that the addition of Ce within the range of 0.1 wt% to 0.5 wt% in the Al-4.7Cu-1.0Mn-0.5Mg alloy results in an enhancement in fluidity. Specifically, the alloy containing 0.4 wt% Ce exhibits a significant increase in fluidity distance, from 349.7 to 485.7 mm. This improvement can be attributed to the reduction in viscosity, the refinement of secondary dendrite arm spacing, and the modification of secondary phase particles. However, a higher concentration of Ce leads to a decrease in fluidity length, potentially due to the formation of Al₈Cu₄Ce.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 2","pages":"Pages 377-383"},"PeriodicalIF":5.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140796437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alumina supported platinum-ceria catalyst for reverse water gas shift reaction","authors":"Na Jiang,&nbsp;Weiwei Wang,&nbsp;Haoxin Liu,&nbsp;Meiyao Wu,&nbsp;Chunjiang Jia","doi":"10.1016/j.jre.2024.02.015","DOIUrl":"10.1016/j.jre.2024.02.015","url":null,"abstract":"<div><div>The activation of CO₂ molecules is a fundamental step for their effective utilization. Constructing high-density oxygen vacancies on the surface of reducible oxides is pivotal for the activation of CO₂. In this work, we prepared a series of 0.5Pt<em>x</em>Ce/Al₂O₃ (<em>x</em>=1, 5, 10, or 20) catalysts with varying Ce loading and 0.5 wt% of Pt for the reverse water gas shift (RWGS) reaction. The size of CeO₂ particle increases with Ce loading. Remarkably, the 0.5Pt5Ce/Al₂O₃ catalyst with an average CeO₂ particle size of 5.5 nm exhibits a very high CO₂ conversion rate (116.4×10⁻⁵ mol_CO2/(g_cat·s)) and CO selectivity (96.1%) at 600 °C. Our experimental findings reveal that the small-size CeO₂ in 0.5Pt5Ce/Al₂O₃ possesses a greater capacity to generate reactive oxygen vacancies, promoting the adsorption and activation of CO₂. In addition, the oxygen vacancies are cyclically generated and consumed during the reaction, which contributes to the elevated catalytic performance of the catalyst. This work provides a general strategy to construct rich oxygen vacancies on CeO₂ for designing high-performance catalysts in C₁ chemistry.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 2","pages":"Pages 284-294"},"PeriodicalIF":5.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140046232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive recovery of rare earth elements and gypsum from phosphogypsum: A wastewater free process combining gravity separation and hydrometallurgy","authors":"Jialin Qing ,&nbsp;Dapeng Zhao ,&nbsp;Li Zeng ,&nbsp;Guiqing Zhang ,&nbsp;Liang Zhou ,&nbsp;Jiawei Du ,&nbsp;Qinggang Li ,&nbsp;Zuoying Cao ,&nbsp;Shengxi Wu","doi":"10.1016/j.jre.2024.01.013","DOIUrl":"10.1016/j.jre.2024.01.013","url":null,"abstract":"<div><div>Comprehensive utilization of phosphogypsum (PG) has attracted much attention, especially for the recovery of rare earth elements (REEs) and gypsum due to the issues of stockpile, environmental pollution, and waste of associated resources. Traditional utilization methods suffered the issues of low REEs leaching efficiency, huge amount of CaSO₄ saturated wastewater and high recovery cost. To solve these issues, this study investigated the occurrence of REEs in PG and the leaching of REEs. The results show that REEs in PG are in the forms of (1) REEs mineral inclusions, (2) REEs isomorphous substitution of Ca²⁺ in gypsum lattice, (3) dispersed soluble REEs salts. Acid leaching results demonstrate that (1) the dissolution of gypsum matrix is the control factor of REEs leaching; (2) H₂SO₄ is a promising leachant considering the recycle of leachate; (3) the gypsum matrix suffers a recrystallization during the acid leaching and releases the soluble REEs from PG to aqueous solution. For the recovery of the undissolved REEs mineral inclusions, wet sieving concentrated 37.1 wt% of the REEs in a 10.7 wt% mass, increasing REEs content from 309 to 1071 ppm. Finally, a green process combining gravity separation and hydrometallurgy is proposed. This process owns the merits of wastewater free, considerable REEs recovery (about 10% increase compared with traditional processes), excellent gypsum purification (&gt;95 wt% CaSO₄·2H₂O, with &lt;0.06 wt% of soluble P₂O₅ and &lt;0.015 wt% of soluble F) and reagent saving (about 2/3 less reagent consumption than non-cyclical leaching).</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 2","pages":"Pages 362-370"},"PeriodicalIF":5.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139667562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"La3+ substitution-adjusted magnetic and optical properties with enhanced photocatalytic activity and stability of copper zinc nickel ferrites for wastewater treatment applications","authors":"N.S. Al-Bassami","doi":"10.1016/j.jre.2024.03.007","DOIUrl":"10.1016/j.jre.2024.03.007","url":null,"abstract":"<div><div>Copper-zinc-nickel (Cu–Zn–Ni) ferrite nanoparticles are used for wastewater treatment technology. However, low degradation efficiency and stability are two main issues that make them unsuitable for actual production needs. In this paper, the citrate-nitrate auto-combustion method was applied for the formation of Cu_0.5Zn_0.25Ni_0.25La_<em>x</em>Fe_{2–<em>x</em>}O₄; (0≤<em>x</em>≤0.1; step 0.02) (CZNL) nanoferrites. Although the substitution process entails the replacement of a small ion with a larger one, the lattice constant and crystallite size does not exhibit a consistent incremental pattern. This behavior is justified and discussed. The size of all the CZNL ferrite nanoparticles is in the range of 8–12 nm, and the lattice constant is in the range of 8.6230 to 8.4865 nm. The morphological analysis conducted using field emission-scanning electron microscopy (FE-SEM) reveals that the CZNL exhibits agglomerated spherical morphology. The energy dispersive X-ray spectrameter (EDAX) analysis was employed to confirm the elemental composition of CZNL nanoferrites. Since the process entails the substitution of Fe³⁺ magnetic ions with non-magnetic ions La³⁺, the magnetic parameters of CZNL nanoferrites show a general decreasing trend as predicted. At 20 K, saturation magnetization <em>M</em>_s shows an overall drop in its values from 59.302 emu/g at <em>x</em> = 0.0–41.295 emu/g at <em>x</em> = 0.1, the smallest value of 37.87 emu/g is recorded at <em>x</em> = 0.06. the highest coercivity (<em>H</em>_c = 125.9 Oe) and remanence (<em>M</em>_r = 13.32 emu/g) are recorded for <em>x</em> = 0.08 and <em>x</em> = 0.04 nanoferrite, respectvely. The band gap of all the CZNL nanoferrites was determined using the Kubelka–Munk function and Tauc plot for direct permitted transitions. La doping modifies the band gap (within 1.86–1.75 eV), increases light absorption, induces efficient e/h separation and charge migration to Cu_0.5Zn_0.25Ni_0.25La_<em>x</em>Fe_{2–<em>x</em>}O₄ surfaces. The nanoferrite Cu_0.5Zn_0.25Ni_0.25La_0.06Fe_1.94O₄ achieves a degradation efficiency of 97.3% for methylene blue (MB) dye removal after just 60 min. After five recycling processes, the nanocatalyst Cu_0.5Zn_0.25Ni_0.25La_0.06Fe_1.94O₄ is degraded by 95.83%, resulting in a negligible 1.51% decrease in photocatalytic activity efficiency. The new Cu_0.5Zn_0.25Ni_0.25La_0.06Fe_1.94O₄ has exceptional photocatalytic activity and remarkable stability, making it a promising candidate for applications in wastewater treatment.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 2","pages":"Pages 319-328"},"PeriodicalIF":5.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140125030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ synthesizing nanoscale (Zr,Ti)B2 at intergranular regions of NdCeFeB magnets with enhanced corrosion resistance","authors":"Xuegeng Wang ,&nbsp;Bo Song ,&nbsp;Xiaolian Liu ,&nbsp;Shutai Zhou ,&nbsp;Song Fu ,&nbsp;Kai Xu ,&nbsp;Xinxin Li ,&nbsp;Junjie Ni","doi":"10.1016/j.jre.2025.01.016","DOIUrl":"10.1016/j.jre.2025.01.016","url":null,"abstract":"<div><div>An idea hits us that <em>in-situ</em> synthesizing ceramic phase at intergranular regions of RE-Fe-B alloys should be beneficial to the performance of the materials against corrosion, and in this work a new nanoscale (Zr,Ti)B₂ with space and point groups of <em>P</em>6<em>/mmm</em> and <em>Fmmm</em>, respectively, was successfully synthesized in NdCeFeB sintered magnets. The hcp-structured (Zr,Ti)B₂ phases are present in a stripe-like shape. Some of (Zr,Ti)B₂ are developed at interfaces, and the others exist inside grain boundary phase. They co-exist with REFe₂ and RE-rich phases at intergranular regions. When proximity to RE₂Fe₁₄B grains, their orientation relationships obey <span><math><msub><mrow><mo>[</mo><mn>001</mn><mo>]</mo></mrow><mrow><msub><mi>Nd</mi><mn>2</mn></msub><msub><mi>Fe</mi><mn>14</mn></msub><mi>B</mi></mrow></msub><mo>∥</mo><msub><mrow><mo>[</mo><mn>1</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>0</mn><mo>]</mo></mrow><mrow><msub><mrow><mo>(</mo><mi>Zr</mi><mo>,</mo><mi>Ti</mi><mo>)</mo><mi>B</mi></mrow><mn>2</mn></msub></mrow></msub></math></span>. The formation of (Zr,Ti)B₂ generates significant local compressive stress, being 8.48 GPa, and plenty of reliefs are developed inside the RE₂Fe₁₄B grains. The <em>in-situ</em> formed (Zr,Ti)B₂ modifies the magnet microstructure, lessens the favorable sites for absorption reaction, narrows reaction channels, and reduces the potential difference between intergranular phase and main phase. Such favorable factors greatly enhance the corrosion resistance with an <em>i</em>_corr decrement by 70% in comparison to the unmodified magnet. These new discoveries are thought to be able to provide an insight into the method of potentially improving properties of magnets.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 5","pages":"Pages 989-996"},"PeriodicalIF":5.2,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CeO2@MnO2 with strong Ce-Mn interaction activating PDS to promote in situ degradation of adsorbed tetracycline","authors":"Jinhui Zhang ,&nbsp;Jiawei Sun ,&nbsp;Xinfeng Zhu ,&nbsp;Jingquan Liu ,&nbsp;Linlin Chang ,&nbsp;Guofeng Li ,&nbsp;Rongfu Peng ,&nbsp;Junning Wang ,&nbsp;Libin Jiang ,&nbsp;Kai Wang ,&nbsp;Shiqiang Yin ,&nbsp;Xueping Liu ,&nbsp;Chaohai Wang","doi":"10.1016/j.jre.2025.01.006","DOIUrl":"10.1016/j.jre.2025.01.006","url":null,"abstract":"<div><div>A series of CeO₂@MnO₂ composites was prepared by deposition–precipitation methods. These materials were used to activate sodium persulfate (PDS) for the oxidation of tetracycline. It is found that the composites, especially the CeO₂@MnO₂-1:4 composites, exhibit better tetracycline removal rates than the pure components. X-ray diffraction (XRD), Raman and scanning electron microscopy (SEM) analyses all indicate that the composite has been successfully prepared with high purity and high crystalline. The XPS analysis shows that the strong interaction between the components promotes the electron transfer. Additionally, the kinetic rate constants of CeO₂@MnO₂-1:4 after 60 min are 3.8 and 12.7 times higher than pure CeO₂ and MnO₂, respectively. CeO₂@MnO₂-1:4 composite also exhibits excellent catalytic activity for individual and hybrid pollutants. The effects of wastewater matrix, pH, circulation and ion strength on the degradation of tetracycline were investigated. It is found that CeO₂@MnO₂-1:4 composite has good practical application prospects. CeO₂@MnO₂ composites with synergistic adsorption catalysis can activate PDS and peroxymonosulfate (PMS) for efficient organic catalytic oxidation. This paper provides the theoretical basis and data support for the practical application of the CeO₂@MnO₂ composite materials.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 3","pages":"Pages 490-499"},"PeriodicalIF":5.2,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Persistent scintillators for X-ray repetitive imaging with stable energy traps","authors":"Yuan Wang ,&nbsp;Peng Zhang ,&nbsp;Xu Tian ,&nbsp;Daiyuan Liu ,&nbsp;Jian Zhang ,&nbsp;Zhichao Liu ,&nbsp;Xiuxia Yang ,&nbsp;Jie Yu ,&nbsp;Jianxiong Shao ,&nbsp;Xuhui Xu","doi":"10.1016/j.jre.2025.01.002","DOIUrl":"10.1016/j.jre.2025.01.002","url":null,"abstract":"<div><div>Scintillator is a key material for the development of X-ray detectors, which has a promising application in medical imaging, security inspection and industrial non-injury detection. The majority of scintillators currently used in imaging are real-time imaging scintillators, which can cause ionization radiation damage to biological subjects or detection equipment during the imaging process and require complex, highly sensitive detection systems. Therefore, exploring stable, environmentally friendly scintillator materials that can achieve delayed imaging is of significance in the field of imaging. Herein, we developed an X-ray time-lapse imaging scintillator, Sr₂Al₆O₁₁:Dy³⁺ phosphor, which generates stable traps by X-ray irradiation, thus endowing it with excellent persistent luminescence and information storage properties (&gt;42 d). Moreover, traps constructed by X-ray can be repeatedly refilled (&gt;40 times) under UV light and carriers are released in the form of mechanical or thermal excitation when refilling is complete. By constructing the traps in the phosphor during X-ray excitation and using it for repetitive imaging, the detection limit is 74.78 nGy/s, and the spatial imaging resolution is as high as 16 lp/mm. This discovery provides a new idea for the development of time-delayed X-ray scintillator.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 6","pages":"Pages 1161-1168"},"PeriodicalIF":5.2,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bluish-green emission of novel BaAl2Ge2O8:Eu2+ phosphors under near-ultraviolet excitation","authors":"Sk. Khaja Hussain ,&nbsp;Jae Su Yu","doi":"10.1016/j.jre.2023.11.016","DOIUrl":"10.1016/j.jre.2023.11.016","url":null,"abstract":"<div><div>A new class of phosphor samples, denoted as Ba_{1–<em>x</em>}Al₂Ge₂O₈:<em>x</em>Eu²⁺ (BAGO:<em>x</em>Eu²⁺) was synthesized using a Pechini-type sol–gel technique and subsequent thermal reduction in CO atmosphere. The morphology and structural characteristics of both the BAGO host lattice and the Eu²⁺ ions activated BAGO phosphors were investigated through field-emission scanning electron microscopy and X-ray diffractometry analyses, respectively. The BAGO host lattice has micro-sized particles and the Rietveld refinement reveals the presence of a monoclinic crystal phase, characterized by the space group <em>I</em>2/<em>c</em> (No. 15). Introducing Eu²⁺ ions into Ba²⁺ sites under CO condition reduces the particle size, switching from microscale to nanoscale. Within the near-ultraviolet spectrum (353 nm), the BAGO:<em>x</em>Eu²⁺ phosphors exhibit a broadband bluish-green photoluminescence (PL) emission characterized by a peak band at 492 nm. This phenomenon is attributed to the 4f⁶5d¹ → 4f⁷ electronic transition. The BAGO:0.02Eu²⁺ phosphor shows the strongest bluish-green PL emission, and a comprehensive description of the concentration quenching mechanism between Eu²⁺ ions is revealed. Additionally, the thermal stability of the optimized BAGO:0.02Eu²⁺ phosphor was investigated, and its activation energy was estimated. Therefore, the synthesized bluish-green BAGO:0.02Eu²⁺ phosphor holds the promise of being a novel and potential candidate for utilization in white light-emitting diode applications.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 30-38"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138540099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rare earth elements: Sector allocations and supply chain considerations","authors":"Mpila Makiesse Nkiawete,&nbsp;Randy Lee Vander Wal","doi":"10.1016/j.jre.2024.01.020","DOIUrl":"10.1016/j.jre.2024.01.020","url":null,"abstract":"<div><div>This article addresses the question of how the global and U.S. market sector allocations for rare earth elements compare. Accordingly, this article reports rare earth oxide (REO) market sector allocations, resolved by elemental profile for 2020 and reciprocally REO consumption resolved by end market use. Differences are calculated relative to 2008 and presented as percentages and as absolute tonnage. These differences encompass both changes in relative sector demand and growth rate. Historical trends, global and U.S. for REO usage by sector are calculated for the period of 2018–2022. End market sector demands, as percentages are presented, referenced to United States Geological Survey (USGS) values from 2008. Attention is given to permanent magnets and associated elements given the growing renewable generation and vehicle electrification. The criticality of Nd and Dy are considered given that they are the foundation of NdFeB permanent magnets, prominent in electric vehicle traction motors and direct drive wind turbine generators. Economic activity associated with REE market sectors is presented. Notably usage does not reflect economic value. A prime example are catalysts versus magnets. Last, vast reserves of light and heavy REEs exist in coal and coal-byproducts with potential high impact upon critical REEs and associated economics.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 1-8"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139690161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mössbauer, optical and structural properties of Fe3+ ion in borate glass","authors":"Essam A. Elkelany ,&nbsp;Hesham Y. Amin ,&nbsp;A. Samir ,&nbsp;M.M. EL-Hady ,&nbsp;H.H. El-Bahnasawy ,&nbsp;Moukhtar A. Hassan","doi":"10.1016/j.jre.2024.02.021","DOIUrl":"10.1016/j.jre.2024.02.021","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Lanthanum-bearing iron lithium borate glass is a quaternary system for oxide glasses and was prepared via the melt-quenching method. The present article correlates the structure, optical, ligand field and Mössbauer data on iron lithium borate glass containing &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mtext&gt;La&lt;/mtext&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. The density was measured, while the molar volume was calculated. Other physical parameters are well-described. With increasing the &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mtext&gt;La&lt;/mtext&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; content within the glass network, infrared spectra analysis reveals structural modifications such as the increase in &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mtext&gt;BO&lt;/mtext&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; units and the decline in both &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mtext&gt;BO&lt;/mtext&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; units and NBO bonds content. Furthermore, optical absorption spectra were measured. The absorption spectra disclose a plethora of electronic transitions that are related to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mtext&gt;Fe&lt;/mtext&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; in tetrahedral and octahedral sites, however, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mtext&gt;Fe&lt;/mtext&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; phase is not observed in optical spectra, but it has a clear signature in Mössbauer spectra. Besides, the glass absorption edges undergo a clear blue shift, reflecting an increased band gap energy (1.96–2.28 eV). The decline in NBO bonds justifies this trend. Bewitchingly, the values of crystal field splitting are increased, while the values of Racah parameters are decreased. This trend is justified by the decline in NBO bonds and increases electron localization around Fe cations. Mössbauer spectra confirm the existence of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mtext&gt;Fe&lt;/mtext&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; in tetrahedral and octahedral sites, while &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mtext&gt;Fe&lt;/mtext&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; exists in only a tetrahedral state. With increasing &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mtext&gt;La&lt;/mtext&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;msub&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; content, the isomer shift of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mtext&gt;Fe&lt;/mtext&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; in tetrahedral sites changes to be 0.312–0.329 mm/s, while the isomer shift of octahedral &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mtext&gt;Fe&lt;/mtext&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; is 0.424–0.456 mm/s. These findings coincide with optical data. While the isomer shift of tetrahedral &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mtext&gt;Fe&lt;/mtext&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; is 0.902–0.911 mm/s. Our results of structural, optical and ligand field associated with Mössbauer spectra open more vistas toward the utility of these samples in the optics rea","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 162-170"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}