Crystal Research and Technology最新文献

{"title":"Research on the Heterogeneous Deformation Behavior of Nickel Base Alloy Based on CPFEM","authors":"Erqiang Liu,&nbsp;Mengchun You,&nbsp;Hongwei Zhao,&nbsp;Jianguo Wu,&nbsp;Xianliang Yang,&nbsp;Gesheng Xiao,&nbsp;Jinbao Lin","doi":"10.1002/crat.202400170","DOIUrl":"https://doi.org/10.1002/crat.202400170","url":null,"abstract":"<p>In this paper, a crystal plasticity finite element method (CPFEM), considering the grain morphology and orientation, as well as the dislocation density, is used to research the tensile deformation behavior of GH4169 based on Electron Backscatter Diffraction (EBSD). The stress, plastic strain, and dislocation density distributions are obtained for different levels of deformation. Results show that the stress, plastic strain, and dislocation density exhibit obvious heterogeneous plastic deformation, and stress concentration and dislocation pileup mainly occurs near grain boundaries. The initial dislocation density mainly affects the stress–strain curve of the material, and it can obviously effect the yield strength but cannot influence the hardening ability of the material. The total dislocation density increases with plastic strain. However, the texture evolution has no evident change with increasing plastic strain, except for the increase of texture content in Cube (001)[100].</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665146","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}

{"title":"Growth of YAG:Nd laser crystals by Horizontal Directional Crystallization in Protective Carbon-Containing Atmosphere","authors":"S. Nizhankovskyi,&nbsp;A. Romanenko,&nbsp;O. Serdiuk,&nbsp;E. Vovk,&nbsp;N. Sidelnikova,&nbsp;A. Kozlovskyi,&nbsp;S. Kryvonohov,&nbsp;O. Lukienko,&nbsp;S. Skorik,&nbsp;N. Kovalenko,&nbsp;K. Bryliova,&nbsp;I. Pritula","doi":"10.1002/crat.202400104","DOIUrl":"https://doi.org/10.1002/crat.202400104","url":null,"abstract":"<p>Laser-quality yttrium-aluminum garnet single crystals doped with neodymium (YAG:Nd) of a concentration up to 1 at. % is grown by the method of horizontal directional crystallization from a molybdenum crucible in the protective reducing atmosphere based on argon, СО, and hydrogen. It is found that the content of carbon impurity in the grown crystals does not exceed 5·10⁻³ wt %, the content of molybdenum being on the level of 1.5·10⁻³ wt %. The optical quality of the crystals depends on the composition of the growth atmosphere and annealing. It is shown that, besides the bands of neodymium ion absorption, the crystals are characterized by the intense absorption in the UV edge of the spectrum at 370 nm wavelength, and by the wide absorption band with a maximum at 580 nm caused by formation of F and F⁺-centers. The absorption at 370 and 580 nm can be eliminated by annealing. The structure perfection of the crystals is characterized by the rocking curve half-width (<i>β</i>) which value varies within the limits of 10–14 arc. sec for (001) plane. Laser testing demonstrates the parameters comparable with those of YAG:Nd crystals grown by the Czochralski method from iridium crucible.</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665071","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}

{"title":"Preparation and Photophysical Properties of Znq2 Metallic Nanomaterials","authors":"Fulian Li,&nbsp;Yunshuai Long,&nbsp;Xin Huang,&nbsp;Penghui Ma,&nbsp;Guiyi Huang,&nbsp;Yumin Song","doi":"10.1002/crat.202400116","DOIUrl":"https://doi.org/10.1002/crat.202400116","url":null,"abstract":"<p>Bis(8-hydroxyquinolates) Zinc (Znq₂) can be used as a light-emitting layer material in OLED devices to achieve its efficient electroluminescence effect. In this paper, Znq₂ powder has been successfully synthesized and modified by the physical vapor deposition (PVD) method. Precursors and nano-materials are characterized by XRD, SEM, PL, and so on. The performance of the modified material has been significantly improved. The emission intensity and absorption intensity in the deposited products increased with the increase in PVD temperature. At 453 K, luminous properties such as luminous intensity reach the optimal value including its fluorescence lifetime. Fluorescence lifetime values vary from 13 to 17 ns with the increase in temperature. The luminescence mechanism is also discussed. The energy gap and absorption spectrum of HOM-LUMO are calculated by the DFT/UB3LYP method. The experimental values agree well with the theoretical values. The nanomaterial crystals modified by PVD technology are more orderly, impurities are reduced, and the luminous stability of the material is improved, which may be one of the reasons for the relatively slow decline in product life. The research combined with theoretical simulation is expected to be helpful to the research and promotion of such materials.</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664814","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}

{"title":"Issue Information: Crystal Research and Technology 10'2024","authors":"","doi":"10.1002/crat.202470043","DOIUrl":"https://doi.org/10.1002/crat.202470043","url":null,"abstract":"","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/crat.202470043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142435270","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}

{"title":"Green Conversion of Epoxides to Cyclic Carbonates by Copper Nanocrystals Fabricated on Jute Tartaric Acid Composite Surface","authors":"Sankar Barman,&nbsp;Sushobhan Ghosh","doi":"10.1002/crat.202400114","DOIUrl":"https://doi.org/10.1002/crat.202400114","url":null,"abstract":"<p>The synthesis of copper nanocrystals on tartaric acid jute composite surface is reported. The formation of nanocrystals is detected by FT IR, Powder X-ray diffraction, SEM, and TEM analysis. The average size of the nanocrystals is found to be 500 nm. The reaction of the copper nanocrystals with CO₂ resulted in a decrease in the size of the nanoparticles. Cycloaddition reaction of epoxides to cyclic carbonate is efficiently carried out by the copper nanocrystals on tartaric acid jute composite surface (CUNPJT) without using any cocatalyst and solvent. To the best of author's knowledge, this is the first example of copper nanocrystals catalyzing the cycloaddition of CO₂ and epoxide.</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664527","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}

{"title":"Correction to First-Principles Calculations to Investigate the Ground State, Mechanical Stability, Electronic Structure, and Optical Properties of Tl2SnX3 (X = S, Se, Te)","authors":"","doi":"10.1002/crat.202470042","DOIUrl":"https://doi.org/10.1002/crat.202470042","url":null,"abstract":"<p>[Hanen Alhussain, Hela Ferjani, Youssef Ben Smida; https://doi.org/10.1002/crat.202300340]</p><p>[An error in the spelling of an author's name in the article. The name in the published paper is [Hanen] and should be corrected to [Hanan].</p><p>We apologize for this error.</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/crat.202470042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142435790","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}

{"title":"Morphologically and Compositionally Controlled Cs2SbBr6 by Bi and Ag Substitution","authors":"Alexander Frebel,&nbsp;Songhak Yoon,&nbsp;Samuel Meles Neguse,&nbsp;Dennis Michael Jöckel,&nbsp;Marc Widenmeyer,&nbsp;Stefan G. Ebbinghaus,&nbsp;Benjamin Balke-Grünewald,&nbsp;Anke Weidenkaff","doi":"10.1002/crat.202400055","DOIUrl":"10.1002/crat.202400055","url":null,"abstract":"<p>Morphology-controlled Cs₂SbBr₆ crystals are synthesized by Bi- and Ag-substitution of the precursor solution. X-ray diffraction (XRD) together with Raman spectroscopy confirms the lattice tilting and symmetry changes with the dominant appearance of higher index facets by Bi substitution. Ag substitution does not induce crystal symmetry changes in the Cs₂BBr₆ (B = Sb or Bi) phase, but results in highly defective structures hindering the formation of a smooth surface during the crystal growth. Successful substitution of Bi and limited substitution of Ag into Cs₂SbBr₆ is also confirmed by energy dispersive X-ray spectroscopy (EDX). This research provides design principles and practical examples of how to control the morphology of Cs₂SbBr₆ crystals with structural defects and multiphase formation.</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/crat.202400055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268284","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}

{"title":"Copper Intercalation Effect on Thermoelectric Performance of Pristine Tin Selenide","authors":"Satendrasinh Bharthaniya,&nbsp;Mahesh Chaudhari,&nbsp;Ajay Agarwal,&nbsp;Kailash Chaudhari,&nbsp;Sunil Chaki","doi":"10.1002/crat.202400115","DOIUrl":"https://doi.org/10.1002/crat.202400115","url":null,"abstract":"<p>Pristine tin selenide (SnSe) and copper (Cu) doped SnSe single crystals are grown by direct vapour transport technique. The energy dispersive X-ray, X-ray diffraction and Raman spectroscopic analysis of grown crystals show preferred stoichiometry having a single phase othorhombic SnSe. The electrical conductivity of SnSe and Cu doped SnSe are 24.24 and 106.06 S m⁻¹ at 310 K respectively which increase as temperature increases. Carrier concentration of grown single crystals are evaluated by the Hall effect. Lattice thermal conductivity of pristine SnSe is 0.61 W mK⁻¹, that decreased by copper doping to 0.44 W mK⁻¹ at 310 K and for both the crystals it shows decrement as temperature increases to 483 K. Seebeck coefficient of the grown SnSe and Cu doped SnSe are positive and obtained values are 536.44 and 492.90 µV K⁻¹ respectively at 310 K that confirm the p-type semiconducting nature. Power factor, Figure of merit and thermoelectric compatibility factor of grown pristine SnSe is 0.25 × 10⁸ µV mK⁻², 0.005 and 0.02 Volt⁻¹ respectively and shows improvement in Cu doped SnSe, i.e., 0.08 × 10⁸ µV mK⁻², 0.017 and 0.07 Volt⁻¹ respectively at 310 K. This shows Cu doping in SnSe makes it an effective thermoelectric device contender.</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142435835","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}

{"title":"Characterization of Elastic Constants of Langatate Single Crystals with 32 Symmetry Using Ultrasonic Pulse-Echo Technique","authors":"Chuanwen Chen,&nbsp;Lei Qin,&nbsp;Maoxin Su,&nbsp;Yang Xiang,&nbsp;Liguo Tang,&nbsp;Kainan Xiong,&nbsp;Kechen Wu,&nbsp;Xiaoniu Tu,&nbsp;Wenyu Luo","doi":"10.1002/crat.202400081","DOIUrl":"10.1002/crat.202400081","url":null,"abstract":"<p>In this study, the propagation of plane waves in the lanthanum gallium tantalate (langatate, LGT) single crystals is investigated. Moreover, the flight time of different waves in the LGT rectangular parallelepiped sample is measured using the ultrasonic pulse-echo (UPE) technique, and the elastic constants of the LGT sample are determined. The experimental results clearly show echoes corresponding to the longitudinal and transverse waves along the <i>x</i>-axis. The waves along the <i>z</i>-axis have a similar property. However, the waves along the <i>y</i>-axis are more complex than those along the <i>x</i>- and <i>z</i>-axes. The echoes corresponding to the quasi-longitudinal waves along the <i>y</i>-axis are clear, but those corresponding to the transverse and quasi-transverse waves along the <i>y</i>-axis are not. The elastic constant can be accurately determined if the wave echoes corresponding to this constant propagate without distinct distortion and are clear; otherwise, it may be impossible to accurately determine the constant using UPE. All elastic constants <span></span><math>\u0000 <semantics>\u0000 <msubsup>\u0000 <mi>c</mi>\u0000 <mrow>\u0000 <mi>i</mi>\u0000 <mi>j</mi>\u0000 </mrow>\u0000 <mi>E</mi>\u0000 </msubsup>\u0000 <annotation>$c_{ij}^{mathrm{E}}$</annotation>\u0000 </semantics></math> except <span></span><math>\u0000 <semantics>\u0000 <msubsup>\u0000 <mi>c</mi>\u0000 <mn>13</mn>\u0000 <mi>E</mi>\u0000 </msubsup>\u0000 <annotation>$c_{13}^{mathrm{E}}$</annotation>\u0000 </semantics></math> of the LGT single crystals can be determined using UPE from one sample. This study uses UPE to provide a reference for the characterization of elastic constants of piezoelectric crystals with 32 symmetry from one sample.</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 11","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142247749","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}

{"title":"The Impact of Melt Transparency on Li2MoO4 Single Crystal Growth by the Czochralski Technique","authors":"Yahia Zakarya Bouzouaoui,&nbsp;Rayane Ayadi,&nbsp;Oumaima Brakni,&nbsp;Samir Zermout,&nbsp;Idir Lasloudji,&nbsp;Matias Velázquez","doi":"10.1002/crat.202400095","DOIUrl":"10.1002/crat.202400095","url":null,"abstract":"<p>In this paper, it is found that taking a semitransparent melt, influences c–m interface shape, heat transfer, melt flow and von Mises thermal stress distributions, therefore the quality of the grown crystal. As a result, when absorption coefficients of both melt and crystal change from transparent to opaque case, the c–m interface convexity reduces from 12.5 to 5.8 mm, its shape becomes more convex toward the melt, and the maximum von Mises thermal stresses decreases from 69.55 to 13.8 MPa. For the second study, where the crystal absorption coefficient is fixed at <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>20</mn>\u0000 <mspace></mspace>\u0000 <msup>\u0000 <mi>m</mi>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>1</mn>\u0000 </mrow>\u0000 </msup>\u0000 </mrow>\u0000 <annotation>$20 {{mathrm{m}}}^{ - 1}$</annotation>\u0000 </semantics></math>, the c–m interface convexity increases with the increase in melt absorption coefficient. The maximum and minimum von Mises stresses for the case <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>100</mn>\u0000 <mspace></mspace>\u0000 <msup>\u0000 <mi>m</mi>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>1</mn>\u0000 </mrow>\u0000 </msup>\u0000 </mrow>\u0000 <annotation>$100 {{mathrm{m}}}^{ - 1}$</annotation>\u0000 </semantics></math> are low compared to other values; then the grown crystal has a good quality.</p>","PeriodicalId":48935,"journal":{"name":"Crystal Research and Technology","volume":"59 10","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142183595","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}