Article
Crystallography
Masaru Nakamura, Encarnacion G. Villora, Takeo Ohsawa, Kiyoshi Shimamura, Naoki Ohashi
Summary: The electrical properties of GeS single-crystal were investigated as a function of temperature using the Van der Pauw method. It was found that the electrical resistivity depends on both carrier concentration and mobility. GeS single-crystals with high purity and high crystallinity were obtained through repeated growth using vapor transport. An exceptionally high electrical conductivity was observed between 180 and 450 K, with values ranging from 1.1 x10-2 to 3.7 x10-5 omega- 1 cm-1. Acceptor activation occurred throughout the temperature range, while donor activation only occurred above 280 K. The mobility showed a proportionate relationship with T-2.4, indicating lattice scattering as the predominant factor. At room temperature, the electrical conductivity was 6.7 x 10-3 omega- 1 cm-1, with a hole concentration of 1.7 x 1015 cm-3 and a mobility of 25 cm2/Vs.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Chemistry, Multidisciplinary
Evgeny A. Ekimov, Vladimir S. Krivobok, Mikhail V. Kondrin, Dmitry A. Litvinov, Ludmila N. Grigoreva, Aleksandra V. Koroleva, Darya A. Zazymkina, Roman A. Khmelnitskii, Denis F. Aminev, Sergey N. Nikolaev
Summary: This study focused on the size-controllable synthesis of high-quality SiC nanocrystals, demonstrating the ability to tune crystal size by adjusting synthesis temperature. Optical properties of the SiC crystals were investigated, providing insights into carrier distribution in nanoparticles.
Article
Crystallography
Leila Amiour, Youcef Aouabdia, Nadjah Sobti
Summary: The study investigates the effect of thermal annealing on the microstructure of copper oxide thin films. Copper hydroxide (Cu(OH)2) nanowires were synthesized using a wet chemical method. The obtained materials were characterized through X-ray diffraction, Raman spectroscopy, and Scanning electron microscopy. The results show the formation of cupric oxide (CuO) and cuprous oxide (Cu2O) on the surface of the annealed thin films, with morphology dependent on the annealing temperature. The CuO phase exhibits enhanced photocurrent density compared to the heterostructure (CuO and Cu2O) due to its good conductivity and charge separation.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Chemistry, Inorganic & Nuclear
S. P. Ramteke, G. G. Muley, M. I. Baig, A. Ibrahim, M. Aslam Manthrammel, Khursheed Muzammil, Mohd. Shkir, Mohd Anis
Summary: This study is the first to optimize the crystal growth of potassium aluminium sulfate (KAS) at different pH values. Well-defined KAS crystals were successfully grown and their crystal structure and optical properties were analyzed using various techniques.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Crystallography
Wenyu Yang, Zhengxia Yang, Mengqi Wang, Hongyan Yu, Yejin Zhang, Wei Wang, Xuliang Zhou, Jiaoqing Pan
Summary: This paper reports on the direct growth of In1-xGaxAsyP1-y submicron wires with adjustable wavelengths on a V-groove-patterned Si substrate using metalorganic chemical vapor deposition. By optimizing the growth conditions and changing the epitaxy process parameters, high-quality submicron wires were achieved. Various characterization techniques were used to confirm the performance of the submicron wires.
Article
Crystallography
Ro Mu Jauhar, A. Raja, R. Rajkumar, K. Ramachandran, V. Viswanathan, K. Saravanan, Paavai Era, V Malarvizhi, G. Anbalagan, Muthu Senthil Pandian, P. Ramasamy
Summary: This article reports on the thermoelectric transport properties of CuBiSe2 crystal grown by Bridgman - Stockbarger method, confirming its structure and chemical composition through XRD and XPS. The grown crystal exhibits high power factor and figure of merit at elevated temperatures.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Chemistry, Multidisciplinary
Tsutomu Kanno, Hiromasa Tamaki, Masato Yoshiya, Hiroshi Uchiyama, Sachiko Maki, Masaki Takata, Yuzuru Miyazaki
Summary: A study on Mg3Sb2 revealed it to be heavily disordered with Frenkel defects and charge-neutral defect complexes. This compound exhibits exotic n-type dopability and a deviation from the standard temperature dependency in terms of thermal conductivity.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Hang Li, Weibo Hua, Bjoern Schwarz, Martin Etter, Stefan Mangold, Georgian Melinte, Nicola Pietro Maria Casati, Helmut Ehrenberg, Sylvio Indris
Summary: In this study, the structural and electronic changes of LiNiO2 at different temperatures were investigated through thermal treatments. Besides the decomposition process, a series of transformations were discovered under mild conditions, including the reaction with CO2 and the cation off-stoichiometry.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Svenja Senkale, Giannantonio Cibin, Alan Chadwick, Wolfgang Bensch
Summary: Bulk isocubanite (CuFe2S3) was synthesized and investigated as an anode material for sodium-ion batteries, showing excellent electrochemical performance. The complex reaction mechanism involves the conversion of CuFe2S3 to various crystalline and nanocrystalline phases during Na uptake, with CuxS phases playing a key role in maintaining constant specific capacity.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Nikita V. Muravyev, Kyrill Yu. Suponitsky, Ivan V. Fedyanin, Igor V. Fomenkov, Alla N. Pivkina, Igor L. Dalinger
Summary: This article reports a novel high-energy material that can serve as an oxidizer and high-energy additive. The material has a high density and positive oxygen balance, which can improve the specific impulse of rockets. Additionally, it demonstrates detonation performance comparable to the most powerful explosive, CL-20. Eutectics with other compounds are proposed to enhance its processability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Crystallography
Aditi Pathak, Yash N. Doshi, Dimple V. Shah, Hiren N. Desai, Piyush B. Patel
Summary: Alloy engineering was conducted to investigate the effects of Sb and S inclusion on the characteristics of SnSe. A (Sb0.2Sn0.8)0.5(Se0.9S0.1)0.5 quaternary crystal was successfully synthesized using the direct vapour transport (DVT) technique. The crystal's surface morphology, chemical composition, structural, optical, electrical, and photoconductive characteristics were evaluated using appropriate methods. The results showed that the crystal has a flat surface, an orthorhombic structure, a direct bandgap of 1.42 eV, and exhibits n-type semiconducting behavior.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Materials Science, Multidisciplinary
Mattia Gaboardi, Frederic Monteverde, Federico Saraga, Giuliana Aquilanti, Lun Feng, William Fahrenholtz, Gregory Hilmas
Summary: This study presents an extensive and systematic investigation of a class of emerging high-entropy ceramics using high-resolution synchrotron powder diffraction and extended X-ray absorption fine structure analysis. The results indicate a random distribution of atoms with local strain around the d-metals sites, and a linear trend between the average structure and the first-neighbour distances, regardless of the number and type of metals in the high-entropy ceramic.
Article
Physics, Multidisciplinary
Wan-Li Shang, Ao Sun, Hua-Bin Du, Guo-Hong Yang, Min-Xi Wei, Xu-Fei Xie, Xing-Sen Che, Li-Fei Hou, Wen-Hai Zhang, Miao Li, Jun Shi, Feng Wang, Hai-En He, Jia-Min Yang, Shao-En Jiang, Bao-Han Zhang
Summary: This study presents a solution for focusing schemes of flat and bent crystals, with simulations validating the analytical model and achieving good agreement. The use of von Hamos or multi-cone crystals can lead to several hundred times intensity enhancements, benefiting the measurement precision of plasma sources.
Article
Materials Science, Multidisciplinary
Vitalii Ponomar
Summary: In this study, spinel ferrites with tunable magnetic properties were successfully synthesized by thermal treatment, and the changes in magnetization and Curie temperature were observed through different temperature treatments.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Antonio Cervellino, Ruggero Frison
Summary: This article explores the diffraction characteristics of self-organised superlattices of nanocrystals, as well as their characteristic types of disorder, which are crucial for understanding the type and quality of the superlattice ordering.
Article
Crystallography
Jianzheng Hu, Long Yan, Ning Zhou, Yao Chen, Xiaoni Yang, Lianqiao Yang, Shiping Guo
Summary: The effect and mechanism of carrier gas velocity, V/III ratio, and carrier gas velocity match on the growth rate of AlN were investigated in this study. The results showed that the growth rate of AlN initially increased with hydrogen flow rate, reached saturation, and then decreased monotonically. The turning point value depended on the equipment and process. By increasing the MO VM, the growth rate of AlN could be improved, but the uniformity deteriorated due to turbulence and loss of uniform boundary layer. High quality AlN films were successfully grown on nano-patterned sapphire substrates with improved crystalline quality and atomic smooth surfaces.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Tingting Ma, Yang Li, Kangning Sun, Qinglin Cheng, Sen Li
Summary: This study investigates the melting process and nucleation behavior of sodium crystals using molecular dynamics simulation. The results show good agreement between simulated and experimental values for the melting temperature, density, and radial distribution function of sodium. The diffusion coefficient of liquid sodium increases linearly with temperature, and the homogeneous nucleation rate of melting in superheated sodium crystal exponentially increases with temperature. The findings provide theoretical support for applications involving heat and mass transfer in sodium-related systems.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Hisato Nishii, Shintarou Iida, Akira Yamasaki, Takumi Ikenoue, Masao Miyake, Toshiya Doi, Tetsuji Hirato
Summary: Epitaxial V2O3 films were fabricated on sapphire substrates using mist chemical vapor deposition (mist CVD) method, eliminating the need for high vacuum conditions. The films can be grown on sapphire substrates even under atmospheric pressure, with the optimal growth temperature at 823 K. The films grown at 823 K exhibit a metal-insulator transition at approximately 155 K. The film on C-plane sapphire exhibits a lower transition temperature compared to those on R- and A-plane sapphire substrates.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Jani Jesenovec, Kevin Zawilski, Peter Alison, Stephan J. Meschter, Sambit K. Saha, Andrew J. Sepelak, Peter G. Schunemann
Summary: In this study, NiSb needles were successfully formed in InSb by manipulating the growth rate and adding NiSb. These needle structures in InSb can be used to tune the magnetoresistance of devices. Additionally, undoped InSb crystals demonstrated good infrared transmission at low growth rates.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
D. Joseph Daniel, P. Karuppasamy, H. J. Kim
Summary: The 2-amino 4-methyl pyridinium oxalate (2A4MPO) compound was synthesized and its crystal structure, functional groups, thermal stability, electrical properties, and third-order nonlinear optical properties were studied. The results demonstrate that the synthesized crystal has good structural integrity, thermal stability, and potential for third-order nonlinear optical applications.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
C. W. Lan
Summary: The past two decades have witnessed a significant transformation in solar silicon crystal growth, especially in the competition between multi-crystalline silicon (Multi-Si) and mono-crystalline silicon (Mono-Si). The demand for this crucial material has exponentially surged, with silicon solar panels capturing over 95% of the global PV market share. The advancements in crystal growth technology during this period have set historical benchmarks, with the market share shifting from high-performance multi-crystalline silicon (HPM-Si) to CZ silicon.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Peiyao Hao, Lili Zheng, Hui Zhang
Summary: A novel design of argon gas tube for removing impurities during silicon ingot growth was developed, and numerical simulations showed that it can effectively extract SiO.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Geetika Sahu, Chanchal Chakraborty, Subhadeep Roy, Souri Banerjee
Summary: This article discusses the novel fractal nature of hydrothermally synthesized MoS2 QDs. By adjusting the reaction time, the study found that the average size of QDs increases and then decreases with longer reaction times. STEM images indicate that shorter reaction times lead to sheet formation, while extended reaction times cause sheets to fragment into QDs.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Pengjian Lu, Wei Huang, Junjun Wang, Haitao Yang, Shiyue Guo, Bin Li, Ting Wang, Chitengfei Zhang, Rong Tu, Song Zhang
Summary: A systematic study on the tetramethylsilane-hydorgen (TMS-H-2) system for the deposition of pure single-crystal SiC by high-temperature chemical vapor deposition (HTCVD) method is conducted. The study investigates the effect of temperature, pressure, and H-2:TMS ratio on the deposition conditions and provides a theoretical basis and guidance for improving the quality and cost of industrial production of single-crystal SiC.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Xinyu Jiang, Liangliang Liu, Yanqing Liu, Yan Wang, Zhaoping Hou
Summary: Investigation on the preparation of anisometric templated textured high entropy or multi-element doped ferroelectric ceramics was conducted using A-site disordered niobate microcrystals. The effects of process parameters on the morphology and chemical composition were studied, and the photocatalytic properties of the microcrystals were evaluated.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Mobashsara Tabassum, Md. Ashraful Alam, Sabrina Mostofa, Raton Kumar Bishwas, Debasish Sarkar, Shirin Akter Jahan
Summary: In this study, high crystallinity copper nanoparticles were synthesized by altering the reaction medium at low temperatures. The results show that changing the reaction medium can reduce the surface energy of precursors and promote the formation of highly crystalline copper nanoparticles.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Ivan Bodnar, Vitaly V. Khoroshko, Veronika A. Yashchuk, Valery F. Gremenok, Mohsin Kazi, Mayeen U. Khandaker, Tatiana I. Zubar, Daria I. Tishkevich, Alex Trukhanov, Sergei Trukhanov
Summary: This work presents the production of single crystals of Cu2ZnGeSe4, a semiconducting quaternary compound, using a gas chemical method with iodine as a transporter. The phase state, crystal structure, and lattice constants of the synthesized samples were refined and determined. The band gap of Cu2ZnGeSe4 was calculated using transmission spectrum and it was found that the band gap increases by 12% with decreasing temperature in the range of 20-300 K.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Timur Malin, Igor Osinnykh, Vladimir Mansurov, Dmitriy Protasov, Sergey Ponomarev, Denis Milakhin, Konstantin Zhuravlev
Summary: The effect of growth temperature on the buffer leakage currents of GaN-on-Si layers was investigated. It was found that higher growth temperature results in lower leakage currents. The defects in GaN layers grown at different temperatures were studied using photoluminescence technique, and a correlation between leakage currents, structural perfection, and donor concentration in GaN-on-Si layers was established. It was also observed that reduced growth temperature leads to the formation of inversion domains.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Thi-Hoai-Thu Nguyen, Jyh-Chen Chen
Summary: The effect of heater power control on heat, flow, and oxygen transport for CCz crystal growth was studied. Shorter upper side heater design could improve crystal quality and growth, but with higher power consumption.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Peter Rudolph
Summary: This article presents an overview of selected contributions to the development of crystal growth technology by the Laudise Prize awardee 2023. It discusses various aspects such as shaped crystal growth, the correlation between melt structure and crystal quality, control of intrinsic defects and inclusions, prevention of dislocation cell patterns, and melt growth experiments under a travelling magnetic field.
JOURNAL OF CRYSTAL GROWTH
(2024)