Journal of Crystal Growth最新文献_第8页

Sea urchin-like ZnO nanostructures from a zinc commercial primer for removal of methylene blue dye 一种用于去除亚甲基蓝染料的锌商业底漆制备的海胆状ZnO纳米结构

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-15 Epub Date: 2025-11-13 DOI: 10.1016/j.jcrysgro.2025.128417

J. Nava-Martínez , M. Ballesteros-Balbuena , O.F. Olea-Mejía , A.R. Vilchis-Néstor , V.H. Castrejón-Sánchez , S. Camacho-López , M. Camacho-López

In the present work commercial zinc primer was used for the synthesis of sea urchin-like zinc oxide nanostructures. Zn primer was deposited on ceramic square plates followed by drying at ambient conditions. Using a tubular furnace, these samples were subjected to thermal oxidation at 420 °C in air for different treatment times in the range from 20 to 360 min. This allowed us to follow the growth of sea urchin-like nanostructures by scanning electron microscopy (SEM), where we found that the length of the needles of the sea urchin-like nanostructures becomes longer as the thermal oxidation time increases. A series of samples synthesized at 420 °C for 100, 180, and 360 min were prepared to be characterized by Raman spectroscopy, X-Ray diffraction, and scanning electron microscopy (SEM). The Raman spectra indicate the formation of nanometric ZnO in all prepared samples. The X-ray diffractograms gave evidence of a mixture of Zn and ZnO in all samples. Once properly characterized, these samples were used to perform adsorption tests of the model molecule Methylene Blue (MB). All three samples proved effective for MB removal at 78 % efficiency. The results presented in this work, show that the simple and low cost method of using a commercially available primer on ceramic substrates, and its thermal treatment in a conventional furnace, presents a simple and reproducible approach to obtaining sea urchin-like ZnO nanostructures with excellent adsorption retention features of MB dye.

本研究利用工业锌底漆合成了类海胆氧化锌纳米结构。将锌底漆沉积在方形陶瓷板上，然后在常温条件下干燥。使用管状炉，这些样品在420℃的空气中进行热氧化，在20到360分钟的范围内进行不同的处理时间。这使我们能够通过扫描电子显微镜（SEM）跟踪海胆样纳米结构的生长，我们发现随着热氧化时间的增加，海胆样纳米结构的针的长度变得更长。制备了一系列在420℃、100、180和360 min下合成的样品，用拉曼光谱、x射线衍射和扫描电子显微镜（SEM）对其进行了表征。拉曼光谱表明，在所制备的样品中均形成了纳米氧化锌。x射线衍射图证明所有样品中都有锌和氧化锌的混合物。一旦正确表征，这些样品被用来进行模型分子亚甲基蓝（MB）的吸附测试。所有三种样品都证明了对MB的去除效率为78%。本研究结果表明，在陶瓷衬底上使用一种简单、低成本的市售底漆，并在传统炉中进行热处理，是一种简单、可重复的方法，可以获得具有优异吸附保留MB染料特性的海胆状ZnO纳米结构。

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引用次数: 0

Porous silicon prepared by magnesiothermic reduction of silica extracted from a barley straw: Effect of silica crystallization 用镁热还原法从大麦秸秆中提取二氧化硅制备多孔硅：二氧化硅结晶的影响

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-15 Epub Date: 2025-11-13 DOI: 10.1016/j.jcrysgro.2025.128418

M. Naddaf

In this report, amorphous silica powder was extracted from an open atmosphere burned wild barley (Hordeum murinum ssp. leporinum) straw using the alkali leaching method. Nitrogen adsorption–desorption measurements, energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) results, and analysis reveal that the as-extracted amorphous silica is mesoporous with a large surface area (357 m²/g) and somewhat high content of carbon. X-ray diffraction (XRD) patterns showed that the extracted silica crystallized into the cristobalite phase, on heating it in an air atmosphere for 90 min at 1000 ˚C. The effect of the crystallization process on morphological and structural properties of porous silicon (PSi) produced from the extracted silica by magnesiothermic reduction has been investigated. The reduction process of the amorphous extracted silica resulted in the formation of a mixed phase of cubic Si and silicon carbide (SiC), which has a crystallinity index of 52 %, meso/micropores embedded in macro-size voids, average size of Si crystallites of ∼ 70 nm, and specific surface area of ∼ 160 m²/g. In comparison, the PSi produced from the crystallized silica exhibited a single cubic silicon nanocrystalline phase, higher purity, better crystallinity and a smaller average size of Si nano-crystallites. These suggest that the pre-crystallization of agriculture-derived silica precursor can be used as an effective way to produce high-quality PSi. The present work contributes to the previous reported literature on HF-free synthesis of PSi, a promising material for a wide range of applications.

本文从露天燃烧的野大麦中提取了无定形二氧化硅粉末。秸秆采用碱浸法。氮的吸附-解吸、能谱（EDS）和傅立叶变换红外光谱（FTIR）分析结果表明，萃取的无定形二氧化硅具有较大的比表面积（357 m2/g）和较高的碳含量的介孔结构。x射线衍射（XRD）表明，在1000℃的空气中加热90 min后，提取的二氧化硅结晶为方石石相。研究了晶化工艺对硅萃取物镁热还原法制备多孔硅（PSi）形貌和结构性能的影响。无定形萃取二氧化硅的还原过程形成了立方硅和碳化硅（SiC）的混合相，其结晶度指数为52%，中孔/微孔嵌入在大尺寸的孔洞中，Si晶体的平均尺寸为~ 70 nm，比表面积为~ 160 m2/g。相比之下，由二氧化硅结晶制备的PSi具有单立方硅纳米晶相、更高的纯度、更好的结晶度和更小的Si纳米晶的平均尺寸。这表明农业硅前驱体的预结晶可以作为生产高质量PSi的有效途径。本文对前人报道的无hf合成PSi材料的研究工作进行了补充，该材料具有广泛的应用前景。

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引用次数: 0

Numerical simulation of induction skull melting process of gallium oxide compounds 氧化镓化合物感应熔壳过程的数值模拟

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-15 Epub Date: 2025-11-08 DOI: 10.1016/j.jcrysgro.2025.128409

Yanshen Wang , Mingzhi Zhu , Yuan Liu

As a typical wide-bandgap semiconductor, Gallium oxide (Ga₂O₃) crystal is an ideal substrate material for power and deep-ultraviolet devices. The traditional growth process for Ga₂O₃ single crystal requires extremely expensive Ir crucibles, which greatly hinders its application and development. This article aims to develop the induction skull melting (ISM) process for high-purity melting and single crystal growth of Ga₂O₃, without iridium crucible. Based on the multi-field coupling model, a systematical simulation was conducted to study the effect of frequency and magnitude of the induction power on the temperature evolution, the fluid flowing pattern, the meniscus shape, and the skull morphology. Simultaneously, the ignition and solidification process were also displayed. There is a good agreement between the theoretical calculations and the experimental results. The studied results demonstrate that the ISM process has the potential for the melting and growth of Ga₂O₃ single crystal.

作为一种典型的宽禁带半导体，氧化镓（Ga2O3）晶体是电力和深紫外器件的理想衬底材料。传统的Ga2O3单晶生长工艺需要极其昂贵的Ir坩埚，这极大地阻碍了其应用和发展。本文的目的是在没有铱坩埚的情况下，开发高纯度Ga2O3熔炼和单晶生长的感应颅骨熔炼（ISM）工艺。基于多场耦合模型，系统仿真研究了感应功率频率和大小对温度演变、流体流动模式、半月板形状和颅骨形态的影响。同时，还展示了材料的点火和凝固过程。理论计算与实验结果吻合较好。研究结果表明，ISM工艺具有熔化和生长Ga2O3单晶的潜力。

引用次数: 0

Simulation of temperature and convection field of diamond large single crystal growth with different catalyst systems 不同催化剂体系下金刚石大单晶生长的温度场和对流场模拟

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-15 Epub Date: 2025-11-13 DOI: 10.1016/j.jcrysgro.2025.128419

Fuming Deng , Ziyi Liu , Wenli Deng , Xiaozhou Chen , Liqiu Huang , Xiaotian Xing , Houzhen Chen , Junzhe Yu , Can Li

Diamond is the hardest and most stable crystal in nature (lattice constant 3.567 Å, bond length 1.54 Å) formed by carbon atoms bonded by SP³ and large-size diamond single crystals have a wide range of applications, which is one of the research hotspots of superhard materials nowadays. This study focuses on the high-pressure high-temperature (HPHT) method to produce large-size (≥15 ct) single crystals using an optimized China-type apparatus (CHPA). The effects of different catalyst melts on crystal growth rates were investigated by simulating the temperature field and convection field within the composite cavity—key factors influencing crystal growth rates—using the finite element method (FEM) and the Finite Volume Method (FVM).

The research results indicate that using the high-temperature, high-pressure method to produce synthetic diamonds with Fe-Co and Fe-Co-C catalysts can make the temperature distribution in the synthesis chamber more uniform and the carbon convection rate more stable, and provide “visualization” of the growth process for high-temperature, high-pressure synthetic diamonds. It can also adapt to the production needs of diamonds of different shapes, providing new ideas for resolving the conflict between speed and quality in the production of large, high-quality diamonds.

金刚石是自然界中最坚硬、最稳定的晶体（晶格常数3.567 Å，键长1.54 Å），由碳原子通过SP3键合形成，大尺寸金刚石单晶具有广泛的应用，是当今超硬材料的研究热点之一。本文主要研究了高压高温（HPHT）法制备大尺寸（≥15 ct）单晶的方法。采用有限元法（FEM）和有限体积法（FVM）模拟影响晶体生长速率的关键因素——复合材料腔内的温度场和对流场，研究了不同催化剂熔体对晶体生长速率的影响。研究结果表明，采用高温高压方法制备Fe-Co和Fe-Co- c催化剂合成金刚石，可以使合成室内温度分布更加均匀，碳对流速率更加稳定，为高温高压合成金刚石的生长过程提供“可视化”。它还能适应不同形状钻石的生产需要，为解决大质量钻石生产中速度与质量的矛盾提供了新的思路。

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引用次数: 0

Fabrication of polarity-inverted AlN using a single high-temperature face-to-face annealing 单次高温面对面退火制备极性反转AlN

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-15 Epub Date: 2025-11-05 DOI: 10.1016/j.jcrysgro.2025.128408

Kanako Shojiki , Hideto Miyake

To reduce fabrication time, a method for fabricating a vertical-polarity-inverted AlN structure on a sapphire substrate from multilayered sputtered AlN (Sp-AlN) using a single face-to-face annealing (FFA) step is desirable to reduce the fabrication time. In this study, a single FFA was performed on bilayer Sp-AlN structures fabricated using two approaches: switching the sputtering target and introducing a thin Al₂O₃ layer. However, in a stacked structure of Sp-AlN deposited using an Al metal target (Sp-AlN(Al target))/Sp-AlN deposited using a sintered AlN target (Sp-AlN(AlN target)) on sapphire, the results after a single FFA indicated that the oxygen concentration supplied by the sintered AlN target was insufficient for polarity inversion at the intended position. Therefore, Al₂O₃ was introduced as a high-oxygen-concentration layers. Consequently, after a single FFA step, the Sp-AlN(Al target)/Al₂O₃/Sp-AlN(Al target)/sapphire structure, with an Al₂O₃ thickness of more than 2 nm, exhibited a vertical-polarity-inverted AlN structure (Al-polar AlN/N-polar AlN/sapphire) with polarity inversion at the desired positions. Therefore, this route is promising for fabricating vertical-polarity-inverted AlN structures with shorter fabrication times.

为了缩短制备时间，需要采用单步面对面退火（FFA）的方法，在蓝宝石衬底上用多层溅射AlN （Sp-AlN）制备垂直极性倒置AlN结构，以缩短制备时间。在本研究中，采用切换溅射靶和引入薄Al2O3层两种方法对双层Sp-AlN结构进行了单一FFA。然而，在使用Al金属靶材（Sp-AlN(Al target)）沉积Sp-AlN /使用烧结AlN靶材（Sp-AlN(AlN target)）沉积Sp-AlN在蓝宝石上的堆叠结构中，单次FFA后的结果表明，烧结AlN靶材（Sp-AlN(AlN target)）提供的氧浓度不足以在预定位置进行极性反转。因此，Al2O3作为高氧浓度层被引入。结果表明，经过一次FFA处理后，当Al2O3厚度大于2 nm时，Sp-AlN（Al靶）/Al2O3/Sp-AlN（Al靶）/蓝宝石结构呈现出垂直极性反转AlN结构（Al-极性AlN/ n -极性AlN/蓝宝石），并在所需位置发生极性反转。因此，该方法有望以更短的制造时间制造垂直极性反转AlN结构。

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引用次数: 0

Discovery of a new magnesium iron boride Mg4Fe1.1B13.9 in the Mg-Fe-B-N system 在Mg-Fe-B-N体系中发现一种新的镁铁硼化物Mg4Fe1.1B13.9

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-01 Epub Date: 2025-11-06 DOI: 10.1016/j.jcrysgro.2025.128406

N.D. Zhigadlo

A new boron-rich ternary phase, Mg₄Fe_1.1B_13.9, was discovered in the Mg-Fe-B-N quaternary system. This novel phase appears in the form of plate-like shaped crystals formed on the surface of Fe-substituted MgB₂ during high-pressure, high-temperature (HPHT) solution growth at 3 GPa and 1960 °C. Mg₄Fe_1.1B_13.9 crystallizes in an orthorhombic structure with space group Pnam (No. 62) and lattice parameters a = 10.95(2) Å, b = 7.07(1) Å, and c = 8.72(1) Å. Structural refinement reveals a layered architecture composed of alternating layers of Mg-Fe and boron, with boron atoms forming 5-, 6-, and 7-membered ring motifs. A structural comparison indicates that Mg₄Fe_1.1B_13.9 is closely related to the Y₂ReB₆-type borides. This discovery highlights the effectiveness of the HPHT synthesis in accessing new, complex boron-rich phases. As research in the binary Mg-B system approaches saturation, the identification of Mg₄Fe_1.1B_13.9 offers new insights into the formation of phases in the Mg-Fe-B-N system. This paves the way for the guided synthesis of novel borides with unique properties in other multicomponent systems.

在Mg-Fe-B-N四元体系中发现了一种新的富硼三元相Mg4Fe1.1B13.9。在3gpa和1960℃的高压、高温（HPHT）溶液生长过程中，这种新相以板状晶体的形式出现在fe取代MgB2表面。Mg4Fe1.1B13.9为正交晶型，晶格参数为a = 10.95(2) Å， b = 7.07(1) Å， c = 8.72(1) Å。结构细化揭示了由Mg-Fe和硼交替层组成的层状结构，硼原子形成5-，6-和7元环基序。结构比较表明，Mg4Fe1.1B13.9与y2reb6型硼化物密切相关。这一发现突出了HPHT合成在获取新的、复杂的富硼相方面的有效性。随着对二元Mg-B体系的研究接近饱和，Mg4Fe1.1B13.9的鉴定为Mg-Fe-B-N体系中相的形成提供了新的见解。这为在其他多组分体系中定向合成具有独特性能的新型硼化物铺平了道路。

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引用次数: 0

Confined nanocrystallization of anthranilic acid in a mesoporous zeolite matrix 邻氨基苯甲酸在介孔沸石基质中的受限纳米晶化

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-01 Epub Date: 2025-11-04 DOI: 10.1016/j.jcrysgro.2025.128394

K.M.M. Bimsara Chandrasekera , Francesco Civati , Nadeesh M. Adassooriya

This study explores the confined crystallization of anthranilic acid, an active pharmaceutical ingredient (API), within a mesoporous zeolite matrix, emphasizing the impact of nanoscale confinement on crystal size, morphology, and polymorphic outcomes. By leveraging a suite of characterization techniques—including Powder X-ray Diffraction (PXRD), Differential Scanning Calorimetry (DSC), Scanning and Transmission Electron Microscopy (SEM, TEM), and Fourier Transform Infrared (FTIR) Spectroscopy—we elucidate the structural transformations associated with crystallization under nanoconfinement. TEM imaging reveals the formation of needle-like crystals (∼20 nm in diameter) aligned within the zeolite’s 3D pore structure, indicating directional crystal growth constrained by the matrix. DSC analysis shows a depression in melting points relative to the bulk (from 147 ℃ to 143 ℃ and 144 ℃ for acetonitrile- and ethanol-mediated crystallization, respectively), accompanied by broadened endothermic peaks—hallmarks of size and confinement-induced effects. PXRD and FTIR confirm solvent-dependent polymorphic forms (Form I and Form II), underscoring the dual role of confinement and solvent environment in directing polymorphic selection. These findings highlight confined crystallization as a powerful strategy for modulating the physicochemical properties of APIs, offering promising implications for enhancing drug stability, solubility, and delivery efficiency.

本研究探索了氨基苯甲酸（一种活性药物成分）在介孔沸石基质中的受限结晶，强调了纳米级限制对晶体尺寸、形态和多态结果的影响。通过利用一系列表征技术-包括粉末x射线衍射（PXRD），差示扫描量热法（DSC），扫描和透射电子显微镜（SEM， TEM）和傅里叶变换红外（FTIR）光谱-我们阐明了纳米约束下与结晶相关的结构转变。透射电镜成像显示，在沸石的三维孔隙结构中形成针状晶体（直径约20 nm），表明定向晶体生长受到基体的约束。DSC分析显示熔点相对于体积有所下降（乙腈和乙醇介导结晶分别从147℃降至143℃和144℃），并伴有变宽的吸热峰，这是尺寸和约束效应的标志。PXRD和FTIR证实了溶剂依赖性的多晶形式（Form I和Form II），强调了约束和溶剂环境在指导多晶选择中的双重作用。这些发现强调了限制结晶作为调节原料药物理化学性质的有力策略，为提高药物稳定性、溶解度和递送效率提供了有希望的意义。

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引用次数: 0

Elucidating the effect of environmental gas on sample temperature profile through heat transfer modeling of an optical floating zone crystal-growth furnace 通过对光学浮区晶体生长炉的传热模拟，阐明了环境气体对样品温度分布的影响

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-01 Epub Date: 2025-10-28 DOI: 10.1016/j.jcrysgro.2025.128389

Eymana Maria , Jonathan J. Denney , Yusu Wang , Peter G. Khalifah , Katsuyo Thornton

Optical floating zone (OFZ) furnaces have had a transformative effect on many fields due to their ability to rapidly produce large and high-quality single crystals of complex materials. While it is known that the choice of process gas and its flow rate can affect the quality of grown crystals through their influence on sample temperature profiles, their impact is difficult to quantify and predict due to the complex coupling of heat absorption, heat conduction in the sample, heat transport to, from, and within the gas, as well as radiative heat loss. In this work, we first develop and parameterize a heat transfer model of the steady-state temperature profile of a tip-heated SiC rod in the gas environment within the high-temperature furnace by combining in situ experimental measurements and finite element modeling. We then use simulations with these validated models that capture gas contributions to sample thermal processes to understand how the gas environment, including the gas pressure and the choice of the gas (helium, argon, and nitrogen), affects sample temperature profiles within an OFZ furnace. In addition, we examine the large impacts that the sample radius can have on thermal profiles in different gas environments. This study provides essential insights into how the temperature profiles governing crystal growth processes in OFZ furnaces can be effectively controlled, offering the potential to enhance the quality of grown crystals through the rational design of the process gas environment.

光学浮区（OFZ）炉由于能够快速生产复杂材料的大而高质量的单晶，在许多领域产生了变革性的影响。虽然众所周知，工艺气体的选择及其流速可以通过对样品温度分布的影响来影响生长晶体的质量，但由于热吸收、样品中的热传导、气体之间、气体之间和气体内部的热传输以及辐射热损失的复杂耦合，它们的影响很难量化和预测。在这项工作中，我们首先通过结合现场实验测量和有限元建模，建立并参数化了高温炉内气体环境中尖端加热SiC棒的稳态温度分布的传热模型。然后，我们使用这些经过验证的模型进行模拟，这些模型捕获了气体对样品热过程的贡献，以了解气体环境（包括气体压力和气体（氦气、氩气和氮气）的选择）如何影响OFZ炉内的样品温度分布。此外，我们还研究了样品半径在不同气体环境下对热剖面的巨大影响。这项研究为如何有效控制OFZ炉中晶体生长过程的温度分布提供了重要的见解，为通过合理设计工艺气体环境来提高生长晶体的质量提供了潜力。

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引用次数: 0

Numerical simulation study on the influence of process parameters of a horizontal CVD furnace on the deposition thickness and uniformity of ZnS 卧式气相沉积炉工艺参数对ZnS沉积厚度和均匀性影响的数值模拟研究

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-01 Epub Date: 2025-11-01 DOI: 10.1016/j.jcrysgro.2025.128393

Yunhao Yang , Qiangguo Deng , Wenyuan Mao , Sushan Yuan , Yong Zhou , Pingyang Yu

To further investigate the effects of different process parameters on the chemical vapor deposition (CVD) synthesis of zinc sulfide, this study employed Fluent software to conduct numerical simulations of the ZnS synthesis process in a horizontal CVD furnace. Four experimental sets with varying process parameters were established for comparative analysis and validation. The results demonstrated that the maximum deviation in deposition thickness remained below 20 %, confirming the feasibility of numerical simulation. Based on this, the effects of process parameters such as temperature, pressure, and flow ratio on deposition thickness and uniformity were further investigated. The results revealed that within the temperature range of 620 °C to 655 °C, deposition thickness increased with rising temperature while uniformity correspondingly decreased; When pressure increased from 4000 Pa to 5000 Pa, both deposition thickness and uniformity exhibited a decreasing trend; As the H₂S/Zn flow ratio increased, deposition thickness showed a corresponding increase, while uniformity demonstrated minimal variation, with only slight improvement observed within the 0.2–0.5 ratio range; The Ar/H₂S flow ratio exhibited no significant effect on either deposition thickness or uniformity, with both parameters showing only a slight increasing trend within the 4–6 range; The results of this study provide a theoretical basis for optimizing the process parameters of horizontal CVD furnaces to enhance the deposition thickness and uniformity of ZnS.

为了进一步研究不同工艺参数对化学气相沉积（CVD）合成硫化锌的影响，本研究利用Fluent软件对卧式CVD炉中ZnS合成过程进行了数值模拟。建立了4套不同工艺参数的实验装置进行对比分析和验证。结果表明，沉积厚度的最大偏差保持在20%以下，证实了数值模拟的可行性。在此基础上，进一步研究了温度、压力、流量比等工艺参数对沉积厚度和均匀性的影响。结果表明：在620 ~ 655℃温度范围内，沉积厚度随温度升高而增大，均匀性相应降低；当压力从4000 Pa增加到5000 Pa时，沉积厚度和均匀性均呈下降趋势；随着H2S/Zn流动比的增加，沉积厚度相应增加，均匀性变化不大，在0.2 ~ 0.5流动比范围内仅略有改善；Ar/H2S流量比对沉积厚度和均匀性均无显著影响，在4 ~ 6范围内均呈轻微增加趋势；研究结果为优化卧式气相沉积炉工艺参数以提高ZnS的沉积厚度和均匀性提供了理论依据。

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引用次数: 0

Growth of ultra-clean oxide single crystals of the altermagnet candidate RuO2 交替磁体候选材料RuO2超净氧化物单晶的生长

IF 2 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth

Pub Date : 2026-01-01 Epub Date: 2025-11-05 DOI: 10.1016/j.jcrysgro.2025.128405

Shubhankar Paul , Giordano Mattoni , Hisakazu Matsuki , Thomas Johnson , Chanchal Sow , Shingo Yonezawa , Yoshiteru Maeno

We report the details of the growth of ultra-clean oxide single crystals of RuO₂, a candidate material for altermagnetism. By using a necking-structure crystal-growth tube and finely tuning the conditions of the sublimation transport method, we demonstrate a systematic control of the crystal morphology. We obtained mainly three kinds of morphologies: thick plate-like crystals up to

10 \times 5 \times 2 {mm}^{3}

with a large (101) facet, rhombohedral columnar crystals elongating along the [001] direction, and fiber and needle crystals of length up to 8 mm. These crystals show residual resistivity of about

30 n Ω cm

and a residual resistivity ratio (RRR) up to 1200, substantially higher than previous reports. We extended the resistivity modeling and resolved the discrepancy between Debye temperatures from specific heat and resistivity. These ultra-clean oxide crystals with much higher RRR than other recent studies lead us to make a decisive conclusion that the intrinsic ground state of bulk RuO₂ is paramagnetic.

本文报道了RuO2超净氧化单晶的生长过程。通过使用颈状结构的晶体生长管和微调升华传输方法的条件，我们证明了对晶体形态的系统控制。我们主要获得了三种形态：厚度达10×5×2mm3的大（101）面厚板状晶体，沿[001]方向拉长的菱形柱状晶体，以及长度达8mm的纤维和针状晶体。这些晶体的剩余电阻率约为30nΩcm，剩余电阻率比（RRR）高达1200，大大高于以前的报道。我们扩展了电阻率模型，并从比热和电阻率的角度解决了德拜温度的差异。这些超干净的氧化物晶体具有比其他近期研究高得多的RRR，这使我们得出一个决定性的结论，即大块RuO2的本征基态是顺磁性的。

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引用次数: 0