Article
Crystallography
Tatyana Zima, Nikolai Uvarov
Summary: Fluorine-doped tin oxide (FTO) crystal structures with different morphologies and phase compositions were synthesized using the hydrothermal method. The addition of NH4F to the initial solution controlled the pH of the reaction mixture, resulting in changes in crystal shape and structure. The flower-like FTO structures obtained at a mass ratio of F/SnO2 = 0.05 showed the highest conductivity due to the misoriented primary nanocrystals and their local interaction, which are formed during the spontaneous growth under hydrothermal conditions.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Crystallography
Fan Kong, Shuting Zhang, Yu Cheng, Leilei Lan, Teng Qiu
Summary: Regular rhombic crystals have been synthesized via interface reaction using an 8-hydroxyquinoline derivative coordinated with Zn2+ ions. The crystal size can be controlled by the concentration of the ligand solution. The rhombic crystal exhibits a red-shifted absorption band and orange emission compared to the benzonitrile substituted 8-hydroxyquinoline ligand. Many stacked lamellas were observed in the synthesized crystal, formed by strong interaction forces induced by nitrile groups on the lamella surface.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Crystallography
Kloudene A. Salazar, Verdad C. Agulto, Melvin John F. Empizo, Keito Shinohara, Kohei Yamanoi, Toshihiko Shimizu, Nobuhiko Sarukura, Allan Christopher C. Yago, Pinit Kidkhunthod, Suchinda Sattayaporn, Vallerie Ann Samson, Roland Sarmago
Summary: The successful doping of iron (III) in hydrothermal-grown zinc oxide microrods led to more intense and sharper emissions, as well as shorter emission lifetimes. Fe3+ was incorporated in a specific geometry, altering the defect structure effectively.
JOURNAL OF CRYSTAL GROWTH
(2021)
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
Hui Liu, Yuanzheng Zhu, Jie Ma, Chunguang Chen, Ping Cheng, Shuping Zhang
Summary: In this study, different amounts of Pd-doped CeO2 nanomaterials were synthesized by a hydrothermal method and characterized. The results show that doping Pd can enhance the catalytic activity of CeO2, and the CeO2 sample with 5% Pd doping exhibits the best electrochemical detection capability for phenol.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Physics, Multidisciplinary
Manodeep Mondal, Rajesh Ganapathy
Summary: Surface strain affects the dynamics of adsorbates and their interactions. In the case of epitaxy with lattice mismatch, strain-mediated effects are further compounded. In this study, we observed that the diffusivity of adsorbates in a multilayer colloidal film was nonmonotonic, even though the misfit strain relaxed with increasing film thickness. This nonmonotonic behavior can be attributed to the competition between the self-induced in-layer strain and the short interaction range. We also provided direct evidence for long-ranged strain-mediated interactions between the adsorbates, which altered the morphology of the growing film.
PHYSICAL REVIEW LETTERS
(2022)
Article
Crystallography
Wen He, Yusheng Wu, Yuzheng Wang, Laishi Li, Xiande Ma
Summary: The crystallization kinetics of pseudoboehmite was investigated using intermittent crystallization method. A kinetic model based on particle number equilibrium was established for the pseudoboehmite process. It was found that crystal nucleation is mainly caused by crystal collision, diffusion process is the main speed control step, and crystal enlargement mainly originates from growth. Reducing the system temperature resulted in pseudoboehmite crystals with larger and more uniformly distributed particle sizes. Two parallel octahedral units connected by hydroxyl groups preferentially stack along the (020) crystal plane. Excessive interlayer water molecules between (020) crystal planes lead to an increase in interlayer distance. This increased distance weakens the hydrogen bonds, electrostatic forces, and van der Waals forces between the layers, resulting in the formation of folded layers with holes. Finally, the irregular sheets of pseudoboehmite stack together to form porous spherical structures.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Crystallography
Vipin C. Bose, Neena Sugathan, V. Biju
Summary: The report describes a novel low temperature sol-gel method for synthesizing nanostructured Hausmannite, Mn3O4, with very small crystallite size and high phase purity. Analysis using Raman and XPS confirms the presence of Mn in a +4 valence state and the purity of the phase. UV-visible absorption spectra show broad charge transitions associated with different Mn valence states, while DC electrical conductivity is significantly higher compared to single crystalline Mn3O4.
JOURNAL OF CRYSTAL GROWTH
(2021)
Article
Crystallography
D. S. Denisenko, A. V. Timonina, T. N. Fursova, N. N. Kolesnikov
Summary: ZnSe: Cr2+ crystals were grown with concentrations of 5.1017, 1018, and 1019 cm-3 using a high-pressure vertical zone melting technique. Infrared transmittance measurements indicated a noticeable variation in the distribution of Cr2+ ions along the as-grown crystals. The effective segregation coefficients of Cr2+ ions were calculated, and their dependence on concentration was approximated.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Crystallography
Jani Jesenovec, Benjamin L. Dutton, Cassandra Remple, Natalie Smith-Gray, Magesh Murugesan, Carl Peterson, Brooke K. Downing, Sriram Krishnamoorthy, Matthew D. McCluskey, John S. McCloy
Summary: This study investigates the properties of alloyed beta-Ga2O3 material and finds that Sc2O3 alloying can increase the bandgap, but the electrical conductivity is similar to the non-doped material.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Crystallography
Lei Xu, Tengkun Li, Guoqiang Ren, Xujun Su, Xiaodong Gao, Shunan Zheng, Haixiao Wang, Ke Xu
Summary: The lateral growth in the a-direction is an effective method to expand the crystal size in basic ammonothermal GaN growth. Different stress distributions and optical properties were found among distinct regions, along with varying impurity concentrations. The findings indicate a small stress variation among interfaces and suggest the evolution process of lateral crystal growth.
JOURNAL OF CRYSTAL GROWTH
(2021)
Article
Crystallography
F. Ayagh, M. R. Nateghi, M. H. Mosslemin, F. Kalantari
Summary: In this study, the effects of polyethylene glycol (PEG) and L-3,4-dihydroxyphenylalanine (L-dopa) as structure directing agents on the growth of tungsten trioxide crystals by solvothermal method in acetonitrile solution were investigated. The presence of PEG and L-dopa led to a change in crystal growth mechanism, resulting in the transformation of crystal faces from stacked layers to smooth facets. The rate of crystal formation and growth was significantly increased in the presence of 5 w% PEG. The crystals grown in the presence of L-dopa were octahedral WO3·0.5H2O with smooth faces, while those grown in the presence of PEG were octahedral and rectangular microcrystals of WO3·H2O. The transparency and electro-optical properties of the crystal layers were improved in the presence of PEG.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Crystallography
Daniel A. Wilson, Kshitij Gurung, Marjorie A. Langell
Summary: ZnxCu1_xO nanoparticles were synthesized by microwave heating, leading to the formation of single-phase tenorite crystallites with various zinc concentrations. The increase in zinc concentration also resulted in a morphological change in the nanoparticles.
JOURNAL OF CRYSTAL GROWTH
(2021)
Article
Crystallography
S. Vinoth, Vaithinathan Karthikeyan, Vellaisamy A. L. Roy, Bhuvanesh Srinivasan, P. Thilakan
Summary: Bismuth Telluride (Bi2Te3) nanocrystallites were synthesized by solvothermal method and characterized by FESEM, XRD, Raman, and laser flash measurements. The surfactant-free growth resulted in incomplete hexagonal flake-like (BTFL) structures, while the PVP surfactant mixed growth produced complete hexagonal morphologies (BTHP). The thermal conductivity, electrical conductivity, and ZT value of the samples were measured and analyzed, showing different behaviors for BTFL and BTHP samples.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Crystallography
H. Suo, K. Eto, H. Osawa, T. Kato, H. Okumura
Summary: In this study, n-type N-B co-doped 4H-SiC crystals were grown by physical vapor transport method. The relationship between the boron concentration and the mixing ratio of boron carbide (B4C) in the SiC source powder was investigated. Furthermore, the relationship between the boron concentration and dislocation increase in the initial stage of growth was analyzed. It was found that an increase of threading dislocation occurred when the boron concentration was higher than 1 x 10(19) cm(-3) in the initial stage of growth. This threading dislocation increase can be suppressed by performing a pre-sublimation process of the mixed SiC and B4C powder.
JOURNAL OF CRYSTAL GROWTH
(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)