Materials Letters最新文献_第2页

Investigation of microstructural and mechanical properties on a pure niobium fabricated by selective laser melting for defect-free process based on the energy density

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-29 DOI: 10.1016/j.matlet.2025.138487

Seung Jun Han , Jeong Heon Ha , Won Rae Kim , Hyung Giun Kim , In Yong Moon

{"title":"Investigation of microstructural and mechanical properties on a pure niobium fabricated by selective laser melting for defect-free process based on the energy density","authors":"Seung Jun Han , Jeong Heon Ha , Won Rae Kim , Hyung Giun Kim , In Yong Moon","doi":"10.1016/j.matlet.2025.138487","DOIUrl":"10.1016/j.matlet.2025.138487","url":null,"abstract":"<div><div>This study characterized various defects, such as lack-of-fusion and balling defects, in a pure- Nb sample fabricated using selective laser melting. The process conditions were derived from thermodynamic energy–density function (power: 120–470 W, scan speed: 531–2,080 mm/s). The study proposed the optimal range of process parameters that achieved high density and prevented defects, such as lack-of-fusion, in SLM-processed pure Nb. The range of process parameters corresponding to defect-free, high-density samples was identified (power: 330–470 W, scan speed: 841–1,151 mm/s). Subsequently, the microstructural and mechanical-property variations within this range were investigated. Furthermore, hot isostatic pressing post-treatment was conducted to enhance density by reducing porosity defects, preventing the deformation induced by residual stress of the additive manufactured parts. This study highlights the potential of SLM for fabricating high-density pure-Nb components and suggests its potential applications in various fields.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"391 ","pages":"Article 138487"},"PeriodicalIF":2.7,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Effect of piezoelectric field on the photocatalysis of layered BiOI microspheres under ultrasonication-induced deformation

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138474

Chenxia Jia , Wen Guo , Yili Chen , Peng Li , Yongming Fu , Jie Ma

引用次数: 0

Combined structural refinement using x-ray and neutron diffraction and magnetic properties of double perovskites La2-xErxNiMnO6

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138481

M. Harsita , Ugendar Kodam , S.K. Mishra , T. Durga Rao , Smita Borole , S. Rayaprol , P.S.R. Krishna , Bhumireddi Sattibabu

{"title":"Combined structural refinement using x-ray and neutron diffraction and magnetic properties of double perovskites La2-xErxNiMnO6","authors":"M. Harsita , Ugendar Kodam , S.K. Mishra , T. Durga Rao , Smita Borole , S. Rayaprol , P.S.R. Krishna , Bhumireddi Sattibabu","doi":"10.1016/j.matlet.2025.138481","DOIUrl":"10.1016/j.matlet.2025.138481","url":null,"abstract":"<div><div>Double perovskite La<sub>2-x</sub>Er<sub>x</sub>NiMnO<sub>6</sub> (x = 0.00, 0.05, 0.10, 0.15) was synthesized via the solid-state reaction method. The impact of Er<sup>3+</sup> substitution at the La site on structural and magnetic properties was systematically studied. Rietveld refinement of combined X-ray and neutron diffraction data confirmed a monoclinic (P2<sub>1</sub>/n) and rhombohedral (R-3) phase for La<sub>2</sub>NiMnO<sub>6</sub>, while Er doping stabilized the monoclinic phase. The average grain size increased with Er concentration. FTIR and Raman spectra verified characteristic double perovskite bands. The Curie temperature (T<sub>c1</sub>) decreased from 250 K (x = 0.00) to 224 K (x = 0.15), attributed to reduced Ni–O–Mn bond angles and increased Mn/Ni–O bond lengths. The x = 0.05 composition exhibited higher magnetocrystalline anisotropy (7.5 × 10<sup>7</sup> erg/cm<sup>3</sup>) due to La<sup>3+</sup> substitution by Er<sup>3+</sup>.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"391 ","pages":"Article 138481"},"PeriodicalIF":2.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced strain with excellent thermal stability in two-step sintered Gd-doped PMN-PZT for piezoactuator applications

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138477

Anagha Baby, Nimisha Sunny, P. Reema, V. Priyadharshini, S. Susanth, E.K. Sunny, P.J. Jumana, T. Karthik

{"title":"Enhanced strain with excellent thermal stability in two-step sintered Gd-doped PMN-PZT for piezoactuator applications","authors":"Anagha Baby, Nimisha Sunny, P. Reema, V. Priyadharshini, S. Susanth, E.K. Sunny, P.J. Jumana, T. Karthik","doi":"10.1016/j.matlet.2025.138477","DOIUrl":"10.1016/j.matlet.2025.138477","url":null,"abstract":"<div><div>The present study emphasizes the impact of 1.5 mol% Gd-doping in PMN-PZT ceramics on the structure, microstructure, domain dynamics, strain response and its thermal stability developed through two step sintering (TSS) technique. Gd-doped PMN-PZT displayed high density with ∼ 50 % reduction in grain size from 6.48 µm to 3.2 µm and increase in tetragonal phase fraction from 41.08 % to 59.45 %. Further large signal piezoelectric coefficient (d<sub>33</sub>*) increased to 40.4 % i.e., from 457 pm/V to 641 pm/V. Rayleigh and dynamic scaling analysis revealed that Gd-doping increases the reversible domain wall motion thereby leading to improved d<sub>33</sub>* values. Interestingly, temperature dependent unipolar S-E curves measured till 200 °C displayed a strain variation of only 4.7 % in Gd doped PMN-PZT whereas undoped ceramics showcased 51 % variation. These results highlights the potential of Gd-doping and TSS for developing fine grained thermally stable piezoceramics suitable for piezoactuator applications that demand high performance and reliability over wide temperature range.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"391 ","pages":"Article 138477"},"PeriodicalIF":2.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced ferroelectric and ferromagnetic properties simultaneously in 2-2 type Bi0.89Tb0.11Fe0.96Mn0.02Co0.02O3/Zn0.5Cu0.5Fe2O4 thin films

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138482

Wenlong Liu, Jiahua Wei, Di Li, Jin Zong, Qibin Yuan

{"title":"Enhanced ferroelectric and ferromagnetic properties simultaneously in 2-2 type Bi0.89Tb0.11Fe0.96Mn0.02Co0.02O3/Zn0.5Cu0.5Fe2O4 thin films","authors":"Wenlong Liu, Jiahua Wei, Di Li, Jin Zong, Qibin Yuan","doi":"10.1016/j.matlet.2025.138482","DOIUrl":"10.1016/j.matlet.2025.138482","url":null,"abstract":"<div><div>Multiferroic BiFeO3 (BFO) thin films exhibit both ferroelectric and ferromagnetic properties at room temperature, and have broad potential applications in the field of multifunctional electronic devices. Here, 2–2 type Bi<sub>0.89</sub>Tb<sub>0.11</sub>Fe<sub>0.96</sub>Mn<sub>0.02</sub>Co<sub>0.02</sub>O<sub>3</sub>/Zn<sub>1-x</sub>Cu<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub> (BTFMCO/ZC<sub>x</sub>FO, x = 0, 0.5) thin films were successfully prepared on FTO substrates by the sol–gel method, and the effects of the ZC<sub>x</sub>FO magnetic layer on the structural, surface morphological, dielectric, ferroelectric and ferromagnetic properties of the thin films were investigated. The results show that the saturation polarization intensities of the BTFMCO/ZFO thin film and the BTFMCO/ZC<sub>0.5</sub>FO thin film are 60 μC/cm<sup>2</sup> and 82 μC/cm<sup>2</sup>, respectively, and the saturation magnetization intensities are 36.5 emu/cm<sup>3</sup> and 66.1 emu/cm<sup>3</sup>, respectively. After doping the magnetic layer, both the ferroelectricity and ferromagnetism are significantly enhanced simultaneously. These superior multiferroic properties provide new opportunities for the development of innovative multifunctional electronic components.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"391 ","pages":"Article 138482"},"PeriodicalIF":2.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Differences in microscopic properties of two major interfacial transition zones in interface between new and old concrete

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138471

Zhenghao Fu , Hongbing Zhu , Zhengfa Guo

{"title":"Differences in microscopic properties of two major interfacial transition zones in interface between new and old concrete","authors":"Zhenghao Fu , Hongbing Zhu , Zhengfa Guo","doi":"10.1016/j.matlet.2025.138471","DOIUrl":"10.1016/j.matlet.2025.138471","url":null,"abstract":"<div><div>At present, there are few microscopic explanations for the fact that excessive interfacial roughness is detrimental to interfacial bonding strength between new and old concrete. To enrich this research field, interfacial transition zone between old concrete’ aggregates and new concrete (ITZ-A) and interfacial transition zone between old concrete’ cement mortar and new concrete (ITZ-C) were as research subjects in this study. Their differences were investigated using scanning electron microscopy and energy dispersive spectroscopy. Comparative analysis revealed significant differences in three critical micro parameters: calcium-to-silicon content ratio (Ca/Si), the percentage of enriched region of CH and C-S-H, and microporosity characteristics. ITZ-C has 16.39 % less Ca/Si, 64.11 % less enriched regions of CH, 49.86 % more enriched regions of C-S-H, and 30.96 % less porosity than the ITZ-A. Moreover, ITZ-C porosity was dominated by sub-0.1 μm<sup>2</sup> micropores (45.26 % of total pore area), while ITZ-A exhibited predominant 1–5 μm<sup>2</sup> mesopores (39.08 % of total pore area). Based on the denseness and integrity of the matrix of the microstructure, the microscopic properties of ITZ-C were superior to those of ITZ-A.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"391 ","pages":"Article 138471"},"PeriodicalIF":2.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

NiSbSn0.5O4.5 medium-entropy alloy oxidation for hydrogen evolution and 5-hydroxymethylfurfural oxidation 用于氢气进化和 5-羟甲基糠醛氧化的 NiSbSn0.5O4.5 中熵合金氧化技术

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138479

Jia Hui , Chunfu Yan , Yongzheng Shi , Zhou Yang

引用次数: 0

Tuning infrared radiative properties using Direct Laser Interference Patterning 利用直接激光干涉图案技术调谐红外辐射特性

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138485

Jon Gabirondo-López , Marcos Soldera , Josu M. Igartua , Andrés Fabián Lasagni , Gabriel A. López

引用次数: 0

Structure and abrasion resistance of Cr0.5Ti0.5N nano-thick coatings deposited by reaction-assisted deposition

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138480

Chunli Qiu, YanChun Dong, Dongyao Zhang, Yanqi Zhao, Yong Yang, Hongjian Zhao

引用次数: 0

SnS2 based Extended-gate Field-Effect Transistor for low voltage pH sensing

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-03-28 DOI: 10.1016/j.matlet.2025.138475

Uvanesh Kasiviswanathan , Lucky Agarwal , Chandan Kumar , Ajay Kumar Dwivedi , Shweta Tripathi

{"title":"SnS2 based Extended-gate Field-Effect Transistor for low voltage pH sensing","authors":"Uvanesh Kasiviswanathan , Lucky Agarwal , Chandan Kumar , Ajay Kumar Dwivedi , Shweta Tripathi","doi":"10.1016/j.matlet.2025.138475","DOIUrl":"10.1016/j.matlet.2025.138475","url":null,"abstract":"<div><div>This letter presents a pH sensing device based on ion exchange on the surface of <span><math><mrow><msub><mrow><mi>SnS</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> thin film for continuous monitoring. The <span><math><mrow><msub><mrow><mi>SnS</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> sensing membrane is fabricated using the sol–gel synthesis technique and deposited onto an indium tin oxide strip. The ion interaction on the <span><math><mrow><msub><mrow><mi>SnS</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> surface for pH sensing is an innovative approach in this work. The <span><math><mrow><msub><mrow><mi>SnS</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> thin film-based extended-gate FET exhibited a remarkable pH sensitivity of <span><math><mrow><mspace></mspace><mo>∼</mo><mn>41.89</mn><mspace></mspace><mi>mV</mi><mo>/</mo><mi>pH</mi></mrow></math></span>, along with outstanding linearity across pH levels ranging from 1 to 11. Additionally, the sensor demonstrates commendable stability across the linearity range, with a minimal drift rate of <span><math><mrow><mspace></mspace><mo>∼</mo><mn>2</mn><mo>.</mo><mn>1</mn><mspace></mspace><mi>mV</mi><mo>/</mo><mi>h</mi></mrow></math></span> at pH 9.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"391 ","pages":"Article 138475"},"PeriodicalIF":2.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0