Crystal Research and Technology最新文献_第7页

Masthead: Crystal Research and Technology 5'2021 报头:晶体研究与技术5'2021

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-05-01 DOI: 10.1002/crat.202170019

引用次数: 0

Growth Rate Calculations for Edge‐Defined, Film‐Fed Growth of Sapphire Crystals 蓝宝石晶体边缘定义、薄膜供给生长的生长速率计算

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-04-25 DOI: 10.1002/crat.202000244

F. Bruni

引用次数: 2

Influence of Synthesis Temperature on the Phases Developed and Optical Properties of Manganese Sulfide and Zinc Sulfide 合成温度对硫化锰和硫化锌相发育及光学性质的影响

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-04-13 DOI: 10.1002/crat.202000201

Z. Heiba, M. Mohamed, Noura M. Farag, Sameh I. Ahmed

{"title":"Influence of Synthesis Temperature on the Phases Developed and Optical Properties of Manganese Sulfide and Zinc Sulfide","authors":"Z. Heiba, M. Mohamed, Noura M. Farag, Sameh I. Ahmed","doi":"10.1002/crat.202000201","DOIUrl":"https://doi.org/10.1002/crat.202000201","url":null,"abstract":"Nano MnS and ZnS samples are prepared through a simple thermolysis procedure. The effect of synthesis temperature on the different phases formed and their percentages, and on the lattice parameters and crystallite size of MnS and ZnS is examined using Rietveld analysis for X‐ray diffraction patterns. The minimum synthesis temperature at which MnS can be formed by the present simple procedure is 250 °C, while ZnS can be prepared at a lower temperature of 200 °C. For manganese sulfide, traces of Mn3O4 phase appear at 300 °C and increase with temperature, while ZnS resists oxidation until 500 °C; pure ZnO forms at 700 °C. The MnS and ZnS samples, obtained at all temperatures, are found to be biphasic; cubic and hexagonal. The nano nature of the samples and the particle morphology are investigated by high‐resolution transmission electron microscopy. Fourier‐transform infrared spectroscopy is applied to follow the characteristic vibration bands in both systems. The values of the different energy gaps depend on the crystallite size, phases’ percentages, and the preparation temperature. The photoluminescence intensity and the emitted colors from MnS and ZnS depend on the synthesis temperature.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"57 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85647661","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: 3

Bi4O5BrI Solid Solution towards Boosted Photocatalytic Reduction and Oxidation Activities Induced by Efficient Carrier Separation 高效载体分离诱导Bi4O5BrI固溶体增强光催化还原和氧化活性

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-04-02 DOI: 10.1002/crat.202000240

Jia Zhang, Zhen Wang, Lu Liu, Baorong Hu, Yilei Zhao, Shuang Zhao, Wenting Zhao, Shuang Li, Xi Chen, X. Hai

{"title":"Bi4O5BrI Solid Solution towards Boosted Photocatalytic Reduction and Oxidation Activities Induced by Efficient Carrier Separation","authors":"Jia Zhang, Zhen Wang, Lu Liu, Baorong Hu, Yilei Zhao, Shuang Zhao, Wenting Zhao, Shuang Li, Xi Chen, X. Hai","doi":"10.1002/crat.202000240","DOIUrl":"https://doi.org/10.1002/crat.202000240","url":null,"abstract":"Semiconductor photocatalysis is considered a promising technology for destroying pollutants, while the faint carrier separation efficiency of the photocatalyst is one of the main limitations for obtaining high performance. This study reports a solid solution strategy to achieve effective carrier separation in Bi4O5BrxI2−x. The solid solution structure endows Bi4O5BrxI2−x with proper light adsorption, tunable band gap, and effective separation of photogenerated electrons and holes. As a result, Bi4O5BrxI2−x exhibits reduction and oxidation activities for highly efficient photocatalytic Cr(VI) reduction and tetracycline hydrochloride (HTC) degradation under visible light irradiation, with the activity reaching the maximum at x = 1. Within 30 min, the removal rates of Cr(VI) and HTC reach 90% and 100%, respectively. This study not only provides an effective strategy to increase the carrier separation of bismuth‐based semiconductors, but also opens new opportunities to rationally design other solid solution catalysts with high performance in wastewater treatment.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"98 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81182317","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: 1

Masthead: Crystal Research and Technology 4'2021 报头:晶体研究与技术4'2021

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-04-01 DOI: 10.1002/crat.202170017

引用次数: 0

Numerical Simulation of the Hydrodynamics and Mass Transfer in the Cuboid KDP Crystal Growth under the Jet‐Rotating Crystal Method 射流旋转晶体法下长方体KDP晶体生长流体力学和传质的数值模拟

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-03-29 DOI: 10.1002/crat.202000241

Hang Liu, Mingwei Li, H. Yin, Duanyang Chen, H. Qi

{"title":"Numerical Simulation of the Hydrodynamics and Mass Transfer in the Cuboid KDP Crystal Growth under the Jet‐Rotating Crystal Method","authors":"Hang Liu, Mingwei Li, H. Yin, Duanyang Chen, H. Qi","doi":"10.1002/crat.202000241","DOIUrl":"https://doi.org/10.1002/crat.202000241","url":null,"abstract":"A novel method of crystal growth by introducing jet flow to the pyramidal‐restriction long‐seed growth system of potassium dihydrogen phosphate (KH2PO4, KDP) in rotating crystal method, namely, the jet‐rotating crystal method, is proposed. To evaluate the prospect of this new method, three‐dimensional (3D) time‐dependent numerical simulations of flow and mass transfer involved in the jet‐rotating crystal method are conducted. Compared with the rotating crystal method, the jet‐rotating crystal method can improve the magnitude and distribution homogeneity of the prismatic face supersaturation and obtain high‐quality KDP crystals. The supersaturation on the prismatic face as a function of rotation rate, jet velocity, and crystal size is investigated. The effects of solution flow on mass transfer are analyzed in detail. A further improvement in the magnitude and distribution homogeneity of the prismatic face supersaturation can be observed through designing the jet flow pipes to swing periodically in vertical plane. Besides, the role of natural and forced convection in mass transport is discussed, which indicates that the effects of natural convection can be neglected when the jet velocity is equal to or greater than 0.6 m s–1.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"84 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83375750","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

Polymorphic Control of α and β dl‐Methionine through Swift Cooling Crystallization Process 快速冷却结晶过程中α和β dl -蛋氨酸的多态性控制

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-03-24 DOI: 10.1002/crat.202000208

M. Suresh, K. Srinivasan

引用次数: 3

Study on the Regulation of Piracetam Crystallization Behavior 吡拉西坦结晶行为调控的研究

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-03-24 DOI: 10.1002/crat.202000117

R. Xu, Tingting Xu, Guosheng Wang

引用次数: 1

Effect of Change in Valence State of Ga During Annealing on the Structural, Optical, and Electrical Properties of GZO Crystals 退火过程中Ga价态变化对GZO晶体结构、光学和电学性能的影响

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-03-24 DOI: 10.1002/crat.202100001

Zhen‐Hua Liu, Long Fan, Liping Peng, Jia Li, Yajun Fu, Zhengwei Xiong, Jin Wang, Jin Fang, Tingting Xiao, L. Cao, Wei-Dong Wu

{"title":"Effect of Change in Valence State of Ga During Annealing on the Structural, Optical, and Electrical Properties of GZO Crystals","authors":"Zhen‐Hua Liu, Long Fan, Liping Peng, Jia Li, Yajun Fu, Zhengwei Xiong, Jin Wang, Jin Fang, Tingting Xiao, L. Cao, Wei-Dong Wu","doi":"10.1002/crat.202100001","DOIUrl":"https://doi.org/10.1002/crat.202100001","url":null,"abstract":"In this work, the ZnO:Ga (GZO) single crystals are grown by the chemical vapor transport (CVT) method. The as‐grown crystals are annealed under an oxygen atmosphere at different temperatures. The GZO crystal's structure and its optical and electrical properties are characterized by X‐ray photoelectron spectroscopy (XPS), Raman spectroscopy, X‐ray diffraction (XRD), UV‐VIS spectrophotometry, and variable‐temperature Hall‐effect measurement. The XPS results indicate that the valence states of the majority of gallium atoms in the GZO crystals undergo transition from the metallic (Ga0) to the non‐metallic state (Gax+) with increasing annealing temperature. The Raman and XRD results show that the compressive stress along the biaxial c‐axis on GZO crystals increases gradually with annealing temperature. Meanwhile, the GZO crystal's transmittance within the range of 300 to 1000 nm is improved significantly from being opaque to about 57%. The GZO crystals exhibit a decrease in free‐carrier concentration (1020–1019 cm−3), an increase in carrier mobility (77.8–87.9 cm2/V−1s−1) and resistivity (10−4–10−2 Ω·cm). The annealed GZO crystal's carrier concentration is practically independent of temperature (90–300 K). These results show that the free‐carrier concentrations are affected by the change of valence states in gallium atoms present in the GZO crystal.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"33 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79743778","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

Crystal Morphology Prediction of Olanzapine Forms III and IV 奥氮平III型和IV型晶体形态预测

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2021-03-24 DOI: 10.1002/crat.202000215

Q. Lu, Imran Ali, Zhiyun Wei, Jinjin Li

{"title":"Crystal Morphology Prediction of Olanzapine Forms III and IV","authors":"Q. Lu, Imran Ali, Zhiyun Wei, Jinjin Li","doi":"10.1002/crat.202000215","DOIUrl":"https://doi.org/10.1002/crat.202000215","url":null,"abstract":"It is of great significance to explore and predict crystal growth behavior that can target the optimal growth conditions and obtain ideal properties. The ability to effectively treat schizophrenia and other psychoses has led to numerous studies of olanzapine (OZPN) polymorphs. There are four reported anhydrous forms of OZPN, but two of whose crystal morphologies (forms III and IV) are still unavailable in the laboratory. Based on the advanced spiral growth model, this study predicts the crystal morphologies of OZPN forms III and IV from vapor and different solvents (i.e., water, ethyl acetate, ethanol, cyclohexane, and dichloromethane), where the potential energies between dimeric growth units (stronger than specific energy cutoff) are considered as strong bond. It is demonstrated that the growth rate of form III increases with the increase of supersaturation from 1.01 to 1.07. Form III crystallizes from solvents with the block‐like shape, whereas form IV grows with the rectangular shape, that obviously differs from the flat‐square shapes of form I and form II. This mechanistic model is able to apply on various compounds, especially for the crystals with non‐centrosymmetric molecules to obtain important guidance for their experimental preparations.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"16 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88491160","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: 1