Journal of Crystal Growth最新文献_第10页

ZnO-Nd2O3 nanocomposites: Solution combustion synthesis, structural studies and UV assisted photocatalytic degradation of paracetamol ZnO-Nd2O3纳米复合材料：溶液燃烧合成、结构研究和紫外辅助光催化降解扑热息痛

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2025-01-10 DOI: 10.1016/j.jcrysgro.2025.128056

Nidhi Sharma, Sumita Sood

{"title":"ZnO-Nd2O3 nanocomposites: Solution combustion synthesis, structural studies and UV assisted photocatalytic degradation of paracetamol","authors":"Nidhi Sharma, Sumita Sood","doi":"10.1016/j.jcrysgro.2025.128056","DOIUrl":"10.1016/j.jcrysgro.2025.128056","url":null,"abstract":"<div><div>Solution combustion synthesis route was explored for developing ZnO-Nd<sub>2</sub>O<sub>3</sub> nanocomposites/heterostructures along with pristine ZnO and Nd<sub>2</sub>O<sub>3</sub> using tartaric acid as fuel. From the XRD (X-Ray diffraction) analysis, chemical identity and successful formation of heterostructures was ascertained. Average crystallite size, lattice parameters, microstrain and dislocation density values were evaluated from the XRD data, which were found to be in line with earlier reported studies and suggested the fusing of ZnO and Nd<sub>2</sub>O<sub>3</sub>crystallites to form bigger composite crystals. Surface characterization and grain size estimation was done using FESEM (Field Emission Scanning Electron Microscopy), which indicated that overall morphology and grain size of ZnO-Nd<sub>2</sub>O<sub>3</sub> nanocomposites was an average of individual characteristics of ZnO and Nd<sub>2</sub>O<sub>3</sub> nanomaterials. Elemental composition studies were carried out using EDS (Energy Dispersive Spectroscopy), which depicted the high chemical purity of as synthesized samples. Further, preliminary investigations were performed to assess the photocatalytic activities of as prepared samples by subjecting them to the UV assisted degradation of paracetamol. The ZnO-Nd<sub>2</sub>O<sub>3</sub> nanocomposites were found to exhibit maximum photocatalytic efficiency followed by ZnO and Nd<sub>2</sub>O<sub>3</sub>. The high photocatalytic efficiency of heterostructures was attributed to the higher specific surface area and better separation of charge carriers mediated by Nd<sup>3+</sup> ions. A very little loss of photocatalytic activity was observed for ZnO-Nd<sub>2</sub>O<sub>3</sub> heterostructures when recovered and reused for five consecutive cycles, which was attributed to loss of catalyst after each cycle of recovery and preoccupied active sites of adsorption.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"653 ","pages":"Article 128056"},"PeriodicalIF":1.7,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143128601","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

Effect of UHV annealing on morphology and roughness of sputtered Si(1 1 1)-(7 × 7) surfaces 超高压退火对溅射Si(11 11)-（7 × 7）表面形貌和粗糙度的影响

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2025-01-08 DOI: 10.1016/j.jcrysgro.2025.128055

Jagadish Chandra Mahato , Anupam Roy , Rajib Batabyal , Debolina Das , Rahul Gorain , Tuya Dey , B.N. Dev

{"title":"Effect of UHV annealing on morphology and roughness of sputtered Si(1 1 1)-(7 × 7) surfaces","authors":"Jagadish Chandra Mahato , Anupam Roy , Rajib Batabyal , Debolina Das , Rahul Gorain , Tuya Dey , B.N. Dev","doi":"10.1016/j.jcrysgro.2025.128055","DOIUrl":"10.1016/j.jcrysgro.2025.128055","url":null,"abstract":"<div><div>Ar<sup>+</sup> ion has been used regularly for the cleaning of semiconductor, metal surfaces for epitaxial nanostructures growth. We have investigated the effect of low-energy Ar<sup>+</sup> ion sputtering and subsequent annealing on the Si(1 1 1)-(7 × 7) surfaces under ultrahigh vacuum (UHV) condition. Using <em>in-situ</em> scanning tunnelling microscopy (STM) we have compared the morphological changes to the Si(1 1 1)-(7 × 7) surfaces before and after the sputtering process. Following 500 eV Ar<sup>+</sup> ion sputtering, the atomically flat Si(1 1 1)-(7 × 7) surface becomes amorphous. The average root mean square (rms) surface roughness (<span><math><msub><mi>σ</mi><mrow><mi>avg</mi></mrow></msub></math></span>) of the sputtered surface and that following post-annealing at different temperatures (500–700 °C) under UHV have been measured as a function of STM scan size. While, annealing at ∼500 °C shows no detectable changes in the surface morphology, recrystallization process starts at ∼600 °C. For the sputtered samples annealed at temperatures ≥600 °C, <span><math><msub><mrow><mi>l</mi><mi>o</mi><mi>g</mi><mi>σ</mi></mrow><mrow><mi>avg</mi></mrow></msub></math></span> varies linearly at lower length scales and approaches a saturation value of ∼0.6 nm for the higher length scales confirming the self-affine fractal nature. The correlation length increases with annealing temperature indicating gradual improvement in crystallinity. For the present experimental conditions, 650 °C is the optimal annealing temperature for recrystallization. The results offer a method to engineer the crystallinity of sputtered surface during nanofabrication process.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"653 ","pages":"Article 128055"},"PeriodicalIF":1.7,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143128604","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

Optical and structural characteristics of AlInN/GaN superlattices with varying AlInN fractions 不同AlInN分数的AlInN/GaN超晶格的光学和结构特性

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2025-01-06 DOI: 10.1016/j.jcrysgro.2025.128054

Haotian Xue, Elia Palmese, Ben J. Sekely, Dakota Gray-Boneker, Antonio Gonzalez, Daniel J. Rogers, Brian D. Little, Fred A. Kish, Jr, John F. Muth, Jonathan J. Wierer, Jr

{"title":"Optical and structural characteristics of AlInN/GaN superlattices with varying AlInN fractions","authors":"Haotian Xue, Elia Palmese, Ben J. Sekely, Dakota Gray-Boneker, Antonio Gonzalez, Daniel J. Rogers, Brian D. Little, Fred A. Kish, Jr, John F. Muth, Jonathan J. Wierer, Jr","doi":"10.1016/j.jcrysgro.2025.128054","DOIUrl":"10.1016/j.jcrysgro.2025.128054","url":null,"abstract":"<div><div>Data on the growth and characterization of AlInN/GaN superlattices (SLs) with varying AlInN fractions are presented. The SLs are grown using metal–organic chemical vapor deposition (MOCVD) and have AlInN fractions (AlInN thickness/SL period thickness) from 1 to 0.125 to explore the required GaN thickness to achieve good surface morphology. The SLs with AlInN fractions between 0.992 and 0.645 exhibited well-defined atomic steps and minimal surface defects, while lower fractions resulted in rougher surfaces. The highest AlInN fraction sample (0.992) has less than a monolayer of GaN but exhibits excellent surface morphology comparable to lower fractions. Energy-dispersive X-ray spectroscopy analysis on the highest 0.922 AlInN fraction sample revealed the expected periodic Ga incorporation but also a quaternary composition throughout with a baseline amount of Ga. Spectroscopic ellipsometry measurements demonstrated that the SLs provide refractive index tunability between GaN and AlInN. The results show that SLs maintain a smooth surface morphology across a wide range of AlInN fractions, offering excellent design flexibility for device applications.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128054"},"PeriodicalIF":1.7,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microwave-assisted sol-gel synthesis of Li-Co doped zinc oxide nanoparticles: Investigating the effects of codoping on structural, optical, and magnetic properties for spintronic applications 微波辅助溶胶-凝胶合成掺杂锂-钴的纳米氧化锌颗粒：研究编码掺杂对自旋电子应用的结构、光学和磁学特性的影响

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2025-01-02 DOI: 10.1016/j.jcrysgro.2025.128053

Kaushlendra Pandey , Manoj Kumar , Sunil Chauhan , Ravi Shankar Raman

{"title":"Microwave-assisted sol-gel synthesis of Li-Co doped zinc oxide nanoparticles: Investigating the effects of codoping on structural, optical, and magnetic properties for spintronic applications","authors":"Kaushlendra Pandey , Manoj Kumar , Sunil Chauhan , Ravi Shankar Raman","doi":"10.1016/j.jcrysgro.2025.128053","DOIUrl":"10.1016/j.jcrysgro.2025.128053","url":null,"abstract":"<div><div>In this study, we report a cost-effective microwave-assisted sol–gel synthesis of ZnO and Li-Co co-doped ZnO (Zn<sub>1-2x</sub>Li<sub>x</sub>Co<sub>x</sub>O) nanoparticles. The synthesized Zn<sub>1-2x</sub>Li<sub>x</sub>Co<sub>x</sub>O (x = 0, 0.5, 1.0, 2.0 %) nanoparticles were characterized to study their structural, optical, and magnetic properties. The x-ray diffraction analysis led to the identification of the hexagonal wurtzite phase of the prepared samples. The Rietveld refinement of x-ray diffraction patterns was conducted to ascertain the phase purity of the samples. The W-H analysis of the XRD results has been carried out to estimate the several key parameters such as crystallite size, stress, strain and deformation energy density of the samples. The vibrational properties of the prepared nanoparticles were studied by Fourier Transform Infrared spectroscope. The prepared nanoparticles were observed to have a band gap ranging from 3.3 to 3.1 eV as measured by UV–visible spectroscopy. The co-doping of Li and Co elements in ZnO lattice altered its intrinsic properties, particularly its magnetic properties. The vibrating sample magnetometer measurements showed that the nanoparticles exhibit ferromagnetic behavior at room temperature with 2 % dopant concentration. The value of the of the Coercive field, saturation magnetization and remnant magnetization of the ZLC 2.0 sample were found to be 508 gauss, 0.00365 emu/gram and 4.008 × 10<sup>-4</sup> emu/gram, respectively. This makes Zn<sub>1-2x</sub>Li<sub>x</sub>Co<sub>x</sub>O samples a potential candidate for spintronics and optoelectronic device applications.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128053"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182898","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

A modified microscopic cellular automaton model for the simulation of microstructure evolution during solidification/melting of nickel-based superalloys 一种改进的微观元胞自动机模型用于模拟镍基高温合金凝固/熔化过程中的组织演变

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2024-12-26 DOI: 10.1016/j.jcrysgro.2024.128052

Zhentao Wang, Zhixian Chen, Qingyu Zhang, Xiaonan Wang

{"title":"A modified microscopic cellular automaton model for the simulation of microstructure evolution during solidification/melting of nickel-based superalloys","authors":"Zhentao Wang, Zhixian Chen, Qingyu Zhang, Xiaonan Wang","doi":"10.1016/j.jcrysgro.2024.128052","DOIUrl":"10.1016/j.jcrysgro.2024.128052","url":null,"abstract":"<div><div>A quantitatively modified microscopic cellular automaton model (CA) is established to simulate the microstructure evolution during solidification/melting of IN718 nickel-based superalloys. As compared to the original CA model, the modified CA model has the merits of solute conservation and the inherent incorporation of the melting/solidification algorithms. Inspired by the diffuse interface models, the present model optimizes the diffusion and solute redistribution, and the solute conservation within the computational domain is achieved restrictively. The KGT (Kurz-Giovanola-Trivedi) model was used to calculate the solidification/melting kinetics according to the undercooling values. After testing the grid size independency and grid anisotropy of the modified CA model, it was applied to simulate the growth of multiequiaxed and columnar dendrites of the IN718 alloy under different cooling rates, and the segregation of solute Nb in the liquid phase was quantified. The results reveal that the segregation of Nb was weakened with higher cooling rates during solidification. The simulation of dendritic coarsening during isothermal holding was carried out by the modified CA model in a straightforward manner after the solidified dendrites were obtained. The simulation results effectively mimicked the coarsening behavior driven by the coherent influences of solidification and melting mechanisms, which were uncapable to be reproduced by the original CA model. This study provides a powerful tool with high computation efficiency for better understanding the microstructure evolution mechanisms in nickel-based superalloys during solidification and melting in practical engineering incidents.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128052"},"PeriodicalIF":1.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183751","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

Synthesis of α-Al2O3 nanosize by combustion reaction using sucrose and graphene oxide as fuel precursors 以蔗糖和氧化石墨烯为燃料前驱体，通过燃烧反应合成纳米α-Al2O3

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2024-12-24 DOI: 10.1016/j.jcrysgro.2024.128048

Vu T. Tan , La The Vinh , Nguyen Hoang Tuan , Nguyen Van Doan , Tran Tuan Diep , Pham Van Tuan

{"title":"Synthesis of α-Al2O3 nanosize by combustion reaction using sucrose and graphene oxide as fuel precursors","authors":"Vu T. Tan , La The Vinh , Nguyen Hoang Tuan , Nguyen Van Doan , Tran Tuan Diep , Pham Van Tuan","doi":"10.1016/j.jcrysgro.2024.128048","DOIUrl":"10.1016/j.jcrysgro.2024.128048","url":null,"abstract":"<div><div>The α-Al<sub>2</sub>O<sub>3</sub> nano-sized particles were generated employing a combustion reaction using sucrose and graphene oxide as fuel precursors. The synthesized α-Al<sub>2</sub>O<sub>3</sub> material was analyzed using scanning electron microscopy (SEM), brunauer-emmett-teller (BET), X-ray diffraction (XRD), dynamic light scattering (DLS), and high-resolution transmission electron microscopy (TEM) techniques. XRD study identified α-Al<sub>2</sub>O<sub>3</sub> nanocrystals from aluminum oxide. The results of the SEM and TEM investigations demonstrated that the sucrose samples had particle sizes in the nanoscale range. The study found that higher sucrose concentrations resulted in smaller α-Al<sub>2</sub>O<sub>3</sub> particles. The α-Al<sub>2</sub>O<sub>3</sub> nano-powder had an average diameter of less than 30 nm. Sucrose and GO were coupled for the first time to fabricate nanosized α-Al<sub>2</sub>O<sub>3</sub> powders. The findings may pave the way for new methods of producing stable aluminum nanoparticles in α-phase, which might be useful in a variety of applications.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128048"},"PeriodicalIF":1.7,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183758","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

Data-driven feasibility study of VGF β-Ga2O3 growth under traveling magnetic fields 行磁场下VGF β-Ga2O3生长的数据驱动可行性研究

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2024-12-24 DOI: 10.1016/j.jcrysgro.2024.128049

Gagan Kumar Chappa, Milena Petković, Natasha Dropka

{"title":"Data-driven feasibility study of VGF β-Ga2O3 growth under traveling magnetic fields","authors":"Gagan Kumar Chappa, Milena Petković, Natasha Dropka","doi":"10.1016/j.jcrysgro.2024.128049","DOIUrl":"10.1016/j.jcrysgro.2024.128049","url":null,"abstract":"<div><div>Numerical simulations were conducted to examine the impact of a traveling magnetic field on the vertical gradient freeze growth of β-Ga<sub>2</sub>O<sub>3</sub> crystals within a coated sapphire crucible under an argon-oxygen atmosphere. The research aimed to enhance β-Ga<sub>2</sub>O<sub>3</sub> crystal growth by achieving a flatter solid–liquid interface through the application of Lorentz forces generated by KRIST <span><math><mover><mrow><mi>MAG</mi></mrow><mo>∼</mo></mover></math></span>® heaters. Furthermore, the study sought to identify a coating material that is chemically resistant and has a minimal effect on the magnitude of the Lorentz force.</div><div>To derive an equation that relates the Lorentz force with key growth parameters, we utilized SISSO, a machine learning technique combining symbolic regression and compressed sensing. The numerical results indicated that an upward traveling magnetic field significantly modifies the solid–liquid interface shape by counteracting buoyancy, enhancing vortex strength, and flattening the previously convex interface. The Pt-Rh alloy coating demonstrated minimal impact on the Lorentz force magnitude. Lorentz force exhibited a quadratic dependence on AC, periodic with a phase shift, and an asymmetric Gaussian profile with frequency.</div><div>Compressed sensing, along with numerical data, produced a broadly applicable and interpretable equation for predicting Lorentz force values in the VGF growth setup, identifying phase shift as a crucial variable.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128049"},"PeriodicalIF":1.7,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence factors of aluminum nitride deposition investigated by molecular simulations 采用分子模拟方法研究了氮化铝沉积的影响因素

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2024-12-20 DOI: 10.1016/j.jcrysgro.2024.128050

Yafei Li, Motoaki Kawase

{"title":"Influence factors of aluminum nitride deposition investigated by molecular simulations","authors":"Yafei Li, Motoaki Kawase","doi":"10.1016/j.jcrysgro.2024.128050","DOIUrl":"10.1016/j.jcrysgro.2024.128050","url":null,"abstract":"<div><div>The effects of substrate surface polarity, substrate temperature and deposition rate on the AlN growth with chemical vapor deposition method were studied with the Stillinger–Weber potential. The differences in crystal structures, growth modes, and surface topography at the molecular level were discussed. For N-polar surface, the growth mode of AlN film is mainly vertical-direction growth mode. During the physical adsorption process, the N atoms have a high surface diffusion coefficient (≥ 2 × 10<sup>–11</sup> m<sup>2</sup>/s), due to the low attraction between N-polar AlN substrate surface and the deposited lightweight atoms (N atoms), causing the N atoms to collide with others and form large clusters, thereby leading to a vertical-direction growth mode. For Al-polar surface, the atoms have a low surface diffusion coefficient (≤ 2 × 10<sup>–12</sup> m<sup>2</sup>/s), causing the atoms to bond with the surface atoms quickly and leading to horizontal-direction mode and bilayer growth while maintaining consistent surface polarity. High temperatures promote the cleavage of Al–Al and N–N bonds and facilitating Al–N bond formation through atomic vibrations and translations. High deposition rates lead to increased cluster formation, limiting the time and space for rearrangement of chemically adsorbed atoms. High temperature and low deposition rate are conducive to the smoother surface morphology of the resulting AlN film and lead to the more ordered hexagonal structure. From the results, during the deposition process, high temperature, the Al-polar surface, and low deposition rate are favorable for epitaxial growth of AlN. Finally, the AlN grown on the Al-polar AlN surface contains a small area of N-polar region was studied and the repairmen mechanism of N-polar region is observed.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128050"},"PeriodicalIF":1.7,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183749","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

Thermodynamic analysis of phase and composition during the co-deposition of SiC-HfC films by chemical vapor deposition method 化学气相沉积法共沉积SiC-HfC薄膜时物相及组成的热力学分析

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2024-12-20 DOI: 10.1016/j.jcrysgro.2024.128051

Pengjian Lu , Pu Liao , Chongjie Wang , Yan Xing , Chitengfei Zhang , Qingfang Xu , Rong Tu , Song Zhang

{"title":"Thermodynamic analysis of phase and composition during the co-deposition of SiC-HfC films by chemical vapor deposition method","authors":"Pengjian Lu , Pu Liao , Chongjie Wang , Yan Xing , Chitengfei Zhang , Qingfang Xu , Rong Tu , Song Zhang","doi":"10.1016/j.jcrysgro.2024.128051","DOIUrl":"10.1016/j.jcrysgro.2024.128051","url":null,"abstract":"<div><div>A thorough thermodynamic investigation of phase and composition in the SiCl<sub>4</sub>-HfCl<sub>4</sub>-C<sub>3</sub>H<sub>8</sub>-H<sub>2</sub> system is conducted during the co-deposition of SiC + HfC films by chemical vapor deposition method (CVD). The results indicate that medium temperature ranging from 1000 to1400 <sup>o</sup>C is more suitable for SiC deposition, while higher temperature (1400 ∼ 1800 °C) promotes HfC deposition. The co-deposition of pure SiC and HfC phases is observed when the C<sub>3</sub>H<sub>8</sub>/(SiCl<sub>4</sub> + HfCl<sub>4</sub>) ratio is maintained between 0.15 and 0.3, along with an H<sub>2</sub>/(SiCl<sub>4</sub> + HfCl<sub>4</sub>) ratio exceeding 50. The excess carbon source leads to undesirable formation of graphite, whereas insufficient carburization may result in the formation of impurities such as Si or HfSi<sub>2</sub>. An optimal increase the hydrogen ratio can suppress the formation of the graphite phase, but too much hydrogen may cause the decomposition of SiC, leading to additional impurities. Furthermore, a high-throughput calculation method was employed to generate the composition mapping, which allow for fine-tuned control of SiC-HfC film composition by adjusting temperature and the SiCl<sub>4</sub>:HfCl<sub>4</sub> ratio.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"652 ","pages":"Article 128051"},"PeriodicalIF":1.7,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183750","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

Investigation of MoS2 growth on GaN/sapphire substrate using molecular beam epitaxy 分子束外延技术在GaN/蓝宝石衬底上生长MoS2的研究

IF 1.7 4区材料科学

Journal of Crystal Growth Pub Date : 2024-12-19 DOI: 10.1016/j.jcrysgro.2024.128047

Mohamed Al Khalfioui, Minh Tuan Dau, Zineb Bouyid, Ileana Florea, Philippe Vennéguès, Julien Brault, Stéphane Vézian, Adrien Michon, Yvon Cordier, Philippe Boucaud

引用次数: 0