Article
Optics
M. A. Mora-Ramirez, M. Chavez Portillo, A. Reyes Diaz, O. Portillo Moreno
Summary: In this study, PbS nanocrystalline thin films were systematically doped with Co2+ ions using the green Chemical Bath Deposition technique, and various physicochemical parameters were investigated using a first-order chemical kinetic reaction model. X-ray Diffraction analysis revealed a cubic phase in all samples, with a decrease in grain size and an increase in dislocation density observed after doping. Absorbance and bandgap studies in the Vis-UV region showed electronic transitions and excitonic bands due to higher energy transitions in nanocrystals. Three theoretical models were applied to elucidate the correlation between crystal radius and bandgap energy.
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
Chemistry, Inorganic & Nuclear
Chengyu Zhuo, Zeyu Lyu, Dashuai Sun, Sida Shen, Taixing Tan, Shuai Wei, Zhijun Li, Pengcheng Luo, Hongpeng You
Summary: Na2MgScF7 (NMSF) was synthesized for the first time through hydrothermal and high-temperature solid-state reactions. The NMSF crystalizes in the space group Imma, with the cell parameters a = 10.40860(18), b = 7.32804(12), c = 7.52879(11) angstrom, alpha = beta = gamma = 90 degrees, and V = 574.256(24) angstrom(3). Doping with Tb3+ or Eu3+ ions allows for yellow-green or red emission in NMSF-based phosphors, respectively. In addition, upconversion emission can be achieved by doping with Yb3+-Er3+, Yb3+-Tm3+, Yb3+-Ho3+, or Er3+. The synthesized NMSF:Er3+ phosphor exhibits green upconversion emission at 980 nm excitation and red emission at 1532 nm excitation.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Huiqi Zheng, Jin Chen, Meidan Que, Tai Yang, Zhikang Liu, Weihua Cai, Lingfu Yang, Xinwei Liu, Yanjun Li, Xiaofeng Yang, Yuzhao Ma, Gangqiang Zhu
Summary: The coupling of the piezoelectric effect and photocatalytic process promoted the separation of photogenerated carriers, thus increasing the piezo-photocatalytic activity. BaTiO3 nanoparticles were prepared on the Ti3C2Tx surface, and the obtained BaTiO3/Ti3C2Tx piezo-photocatalysts exhibited rapid electron transfer and a wide visible light response range. These results demonstrate that coupling piezoelectric and photocatalytic properties has broad application prospects in water pollution control.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Crystallography
N. D. Zhigadlo
Summary: In this study, single crystals of a novel strontium osmate, Sr3Os4O14, were successfully grown using the hydrothermal method and opposed anvil high-pressure and high-temperature technique. The crystal structure was identified as tetragonal and belongs to the pyrochlore type. Resistivity measurements showed metallic behavior and temperature-independent paramagnetism. Heat capacity measurements revealed a slightly enhanced Sommerfeld coefficient of gamma = 34 mJ/mol K2. No superconductivity was observed down to 2 K.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Chemistry, Physical
Xinyao Shan, Binghan Li, Botao Ji
Summary: This study successfully synthesized monodisperse wurtzite InP quantum dots through cation exchange reaction and demonstrated the feasibility of using this method to synthesize other III-V wurtzite QDs. Additionally, the growth of a gradient ZnSeS shell on wurtzite InP QDs resulted in fluorescent QDs with controllable emission wavelengths.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
H. Khaleghi, M. H. Ehsani
Summary: This work investigated the structural, magnetic, and optical properties of pure CuO and double-substitution by Fe and Mn ions prepared by the hydrothermal method. Various techniques were used to study the structural and morphological properties. The results showed that the samples exhibited a polycrystalline monoclinic and nanosheet structure. The optical bandgap of the samples was obtained using UV-vis analysis. Vibrating-sample magnetometry revealed paramagnetic behavior in pure CuO and weak ferromagnetic behavior in the other samples.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Ceramics
Iremnur Akcakoca, Mustafa Karayazici, Gulsum Topates
Summary: The effect of pH and time on the morphology of calcium borate powders was studied. Aqueous solutions with five different pH values were prepared, and hydrothermal synthesis was carried out at 200 degrees C for different times. X-ray diffraction and scanning electron microscopy were used to analyze phase formation and powder morphology, and Fourier transform infrared spectroscopy was used to identify the type of borate groups. The results showed that pH directly influenced the growth mechanism of calcium borate crystals, leading to different morphologies.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Woo-Jin Choi, Daejin Yang, Sang-Chae Jeon, Kyoung-Seok Moon
Summary: The effect of MnCO3 additions on crystal structure, grain growth behavior, and dielectric properties were investigated in the La2O3-doped BaTiO3 system. The results showed that the tetragonality and grain shape of the samples were significantly influenced by the amount of MnCO3 added. The grain growth behavior changed from suppressed growth to abnormal growth and finally normal growth with increasing amounts of MnCO3.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xiang He, Chen Chen, Yunyun Gong, Huarong Zeng, Zhiguo Yi
Summary: This study successfully prepared BWO ceramics with different microstructures using precursor morphology control and spark plasma sintering. Excellent polar properties and photovoltaic properties were obtained, with T-BWO ceramics showing higher remnant polarization, piezoelectric coefficient, and short circuit photocurrent compared to R-BWO ceramics. The findings suggest a simple and feasible microstructure engineering approach to manipulate the ferroelectricity and photovoltaic properties of layer-structured materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Materials Science, Ceramics
Vuk Uskokovic, Nenad Ignjatovic, Sreco Skapin, Dragan P. Uskokovic
Summary: Hydroxyapatite (HAp) is a major component of bone tissues in mammals, and possesses exceptional biocompatibility. This study reports the synthesis and characterization of HAp doped with germanium ions for the first time. The doping of germanate ions into HAp altered its crystal lattice, leading to reduced crystallinity and increased microstrain. Additionally, the inclusion of germanate ions improved the particle size and morphology of HAp, and enhanced its surface charge density. Overall, doping HAp with germanate ions facilitated the production of nanorods with enhanced structural disorder and potential biomedical applications.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Feng Hu, Qian Wan, Liping Lu, Haiying Sun, Xiyan Zhang, Zhaohui Bai, Xiaoyun Mi
Summary: In this study, multi-component fluoride phosphors sensitive to 1550 nm were synthesized using the LCS method, with Li+ and K+ ions introduced to enhance luminescence intensity. The introduction of 0.2 mol% Li+ significantly enhanced luminescence intensity and caused lattice expansion.
Article
Chemistry, Multidisciplinary
Wenjun Wang, Molang Cai, Gao Wu, Liangzheng Zhu, Xuepeng Liu, Hui Lv, Songyuan Dai
Summary: This study reveals a facile approach to control the shape and exposed facets of lead-free methylammonium bismuth iodide perovskite single crystals through a ligand-mediated strategy, shedding light on the mechanism behind it. The preparation of centimeter-scaled (110) facet MA(3)Bi(2)I(9) single crystals by this method is believed to be more suitable for commercial applications.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Changjiu Sun, Yuanzhi Jiang, Li Zhang, Keyu Wei, Mingjian Yuan
Summary: Lead halide perovskite nanocrystals (LHP NCs) have great potential in optical sources, photovoltaics, and sensor fields. This Perspective summarizes representative attempts to achieve controlled synthesis of LHP NCs. By changing the synthesis method, LHP NCs with kinetic dominance and size tunability can be obtained. Undesired ripening effects can be eliminated, and homogeneous size distribution can be achieved through rational ligand selection and solvent engineering.
Article
Chemistry, Physical
Aadil Ahmad Bhat, Shakeel Ahmad Khandy, Atif Mossad Ali, Radha Tomar
Summary: Recent advancements in bandgap engineering have opened up possibilities for vacancy ordered double halide perovskites (VO-DHPs), specifically Cs2SnX6 (X = Cl, Br, I), with customizable optoelectronic features. By doping La3+ ions, the band gap of Cs2SnCl6 can be modulated from 3.8 to 2.7 eV, resulting in a stable room temperature dual emission at 440 and 705 nm. Experimental analysis reveals crystalline cubic structures for pristine Cs2SnCl6 and La:Cs2SnCl6, with SEM confirming the development of anisotropic, micrometer-sized truncated octahedral structures (>10 μm). DFT investigations show that the insertion of La3+ ions leads to band splitting in the crystal lattice.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
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)