Article
Materials Science, Multidisciplinary
Tao Jin, Long Yang, Xinyue Zhang, Wen Li, Yanzhong Pei
Summary: The symmetry of crystal structure in real space can be maintained in reciprocal space, which is important for the design of thermoelectric materials. Using the relationship between inter- and intra-layer geometric information allows for the comparison of crystal structures with desired symmetry.
Article
Materials Science, Multidisciplinary
Nikolay Petkov, Totka Bakalova, Aleksei Obrosov, Egor Kashkarov, Martin Kormunda, Pavel Kejzlar, Hristo Bahchedzhiev, Karel Dadourek, Sabine Wei
Summary: Chromium carbonitride coatings were deposited using cathodic arc physical vapor deposition technology at a temperature of 300 C and reactive gasses CH4 and N-2. The coatings exhibited a polycrystalline structure with mixed CrN and Cr2N phases. X-ray photoelectron spectroscopy measurements confirmed the phases and detected surface oxidation. Increasing the CH4 gas flow led to higher hardness and lower coefficient of friction, with the optimal values achieved at CH4 / N-2 = 0.53 and 1.86, respectively. The wear of the coatings increased with increasing CH4 flow rate, while the coefficient of friction decreased, which can be explained by the Rebinder effect.
Article
Materials Science, Multidisciplinary
Chandni Tiwari, Ambesh Dixit
Summary: This study deposited AlN thin films on p-type silicon wafers using ALD techniques, demonstrating high crystallographic quality and smooth surface morphology. Electrical measurements revealed that the AlN films prepared with TDMAA precursor exhibit moderate resistivity and a large bandgap, making them suitable for high-power electronic and piezoelectric applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Optics
David Ceddia, Andrew M. Kingston, Daniele Pelliccia, Alexander Rack, David M. Paganin
Summary: Spatial light modulation is important for various applications, and we propose a new method called ghost projection that does not require configurable beam-shaping elements. Instead, this method displaces a single illuminated mask to create specific radiant exposure distributions. We study the effects and limitations of this method and investigate how to adapt it to spatially nonuniform illumination. These findings will help optimize experimental design and achieve practical ghost projection.
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
Chemistry, Inorganic & Nuclear
Jingtian Zhou, Qiudi Yue, Maksym Opanasenko, Xinyan Chen, Yajun Tao, Zhenlin Luo
Summary: This study investigated the disassembly and reassembly mechanism of three germanosilicate zeolites in HCl vapor, revealing three key steps and comparing their reaction behaviors.
INORGANIC CHEMISTRY FRONTIERS
(2022)
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
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
Materials Science, Multidisciplinary
Hyunkyu Lee, Jong-Hyurk Park, Nikhilesh Maity, Donghoi Kim, Dongsoo Jang, Chinkyo Kim, Young-Gui Yoon, Abhishek K. Singh, Yire Han, Soon-Gil Yoon
Summary: A study found that the domain size of graphene has an effect on the growth behavior of GaN micro-domains. At high temperatures, m-oriented GaN domains dominate when the domain size of graphene is large, while c-oriented GaN domains dominate when the domain size is small. Additionally, the diffusion of adatoms is significantly influenced by both graphene and the different facets of GaN.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Valeriu Mereacre, Pirmin Stueble, Ahmad Ghamlouche, Joachim R. Binder
Summary: LiNbO3-coated LiNi0.5Mn1.5O4 spinel was fabricated through two methods and their structural and electrochemical properties were investigated. The novel chemically activated coating process showed significantly improved performance compared to the sol-gel method, enhancing reversibility and stability of the coated materials.
Article
Materials Science, Coatings & Films
Christiane Waechtler, Christina Wuestefeld, Michal Sima, Jan Pikner, David Rafaja
Summary: This article describes the effects of mechanical treatment on the surface morphology of cemented carbide substrates and the microstructure and properties of chemical vapor deposited (CVD) Ti(C,N) coatings. The relationships between substrate surface roughness and the grain size, preferred orientation of crystallites, residual stress, indentation hardness, and coating adhesion are discussed. The results show that surfaces with microscopic steps and edges facilitate the growth of large Ti(C,N) grains with a weak {211} texture, while coatings deposited on smooth substrates have finer grains, a pronounced {211} texture, and better adhesion. The indentation hardness of the coatings is not affected by substrate treatment. The physical background of these relationships is explained.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Lukas Ahrens, Olena Tverskoy, Svenja Weigold, Michael Ganschow, Frank Rominger, Jan Freudenberg, Uwe H. F. Bunz
Summary: Doubly alkylene bridged 6,13-diphenylpentacene and analogously bridged azapentacenes have been prepared and are shown to be persistent. These doubly bridged azapentacenes exhibit superior photochemical, oxidative, and thermal stabilities compared to azapentacenes protected by bis(TIPS-ethynyl) substituents. Clipping an azaacene into a large ring is a viable complement in stabilization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Inorganic & Nuclear
Nicola D. Kelly, Simon J. Clarke
Summary: We have reported a solid-state synthesis method for all 18 layered oxide chalcogenides and studied their composition and reactivity. It was found that all materials have the same structure and cell, and exhibit temperature-independent paramagnetism and correlated electronic behavior. Additionally, a new metastable layered phase can be obtained by oxidative deintercalation.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Shuo Feng, Rajesh Kumar Singh, Yucheng Fu, Zhuo Li, Yulong Wang, Jie Bao, Zhijie Xu, Guosheng Li, Cassidy Anderson, Lili Shi, Yuehe Lin, Peter G. Khalifah, Wei Wang, Jun Liu, Jie Xiao, Dongping Lu
Summary: In this study, a simple strategy was demonstrated for constructing low-tortuosity through-pores in both vertical and planar directions of electrodes by casting large particles into single-particle-layer electrodes. Through multi-scale characterizations and simulations, correlations between material/electrode structures, electrolyte permeability, polysulfide migration, and sulfur reactions were elucidated. The high-loading and dense sulfur cathode fabricated by this method delivers a high specific capacity at a very low electrolyte/sulfur ratio.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
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)