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

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

{"title":"Sea urchin-like ZnO nanostructures from a zinc commercial primer for removal of methylene blue dye","authors":"J. Nava-Martínez , M. Ballesteros-Balbuena , O.F. Olea-Mejía , A.R. Vilchis-Néstor , V.H. Castrejón-Sánchez , S. Camacho-López , M. Camacho-López","doi":"10.1016/j.jcrysgro.2025.128417","DOIUrl":"10.1016/j.jcrysgro.2025.128417","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"674 ","pages":"Article 128417"},"PeriodicalIF":2.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145578079","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

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

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

M. Naddaf

{"title":"Porous silicon prepared by magnesiothermic reduction of silica extracted from a barley straw: Effect of silica crystallization","authors":"M. Naddaf","doi":"10.1016/j.jcrysgro.2025.128418","DOIUrl":"10.1016/j.jcrysgro.2025.128418","url":null,"abstract":"<div><div>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 m<sup>2</sup>/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 m<sup>2</sup>/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.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"674 ","pages":"Article 128418"},"PeriodicalIF":2.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145578077","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

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

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

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

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

{"title":"Simulation of temperature and convection field of diamond large single crystal growth with different catalyst systems","authors":"Fuming Deng , Ziyi Liu , Wenli Deng , Xiaozhou Chen , Liqiu Huang , Xiaotian Xing , Houzhen Chen , Junzhe Yu , Can Li","doi":"10.1016/j.jcrysgro.2025.128419","DOIUrl":"10.1016/j.jcrysgro.2025.128419","url":null,"abstract":"<div><div>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 SP<sup>3</sup> 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).</div><div>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.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"674 ","pages":"Article 128419"},"PeriodicalIF":2.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145578078","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

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

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

{"title":"Fabrication of polarity-inverted AlN using a single high-temperature face-to-face annealing","authors":"Kanako Shojiki , Hideto Miyake","doi":"10.1016/j.jcrysgro.2025.128408","DOIUrl":"10.1016/j.jcrysgro.2025.128408","url":null,"abstract":"<div><div>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 Al<sub>2</sub>O<sub>3</sub> 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, Al<sub>2</sub>O<sub>3</sub> was introduced as a high-oxygen-concentration layers. Consequently, after a single FFA step, the Sp-AlN(Al target)/Al<sub>2</sub>O<sub>3</sub>/Sp-AlN(Al target)/sapphire structure, with an Al<sub>2</sub>O<sub>3</sub> 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.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"674 ","pages":"Article 128408"},"PeriodicalIF":2.0,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145479023","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

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

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

N.D. Zhigadlo

{"title":"Discovery of a new magnesium iron boride Mg4Fe1.1B13.9 in the Mg-Fe-B-N system","authors":"N.D. Zhigadlo","doi":"10.1016/j.jcrysgro.2025.128406","DOIUrl":"10.1016/j.jcrysgro.2025.128406","url":null,"abstract":"<div><div>A new boron-rich ternary phase, Mg<sub>4</sub>Fe<sub>1.1</sub>B<sub>13.9</sub>, 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 MgB<sub>2</sub> during high-pressure, high-temperature (HPHT) solution growth at 3 GPa and 1960 °C. Mg<sub>4</sub>Fe<sub>1.1</sub>B<sub>13.9</sub> crystallizes in an orthorhombic structure with space group <em>Pnam</em> (No. 62) and lattice parameters <em>a</em> = 10.95(2) Å, <em>b</em> = 7.07(1) Å, and <em>c</em> = 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 Mg<sub>4</sub>Fe<sub>1.1</sub>B<sub>13.9</sub> is closely related to the Y<sub>2</sub>ReB<sub>6</sub>-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 Mg<sub>4</sub>Fe<sub>1.1</sub>B<sub>13.9</sub> 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.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"673 ","pages":"Article 128406"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518047","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

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

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

{"title":"Confined nanocrystallization of anthranilic acid in a mesoporous zeolite matrix","authors":"K.M.M. Bimsara Chandrasekera , Francesco Civati , Nadeesh M. Adassooriya","doi":"10.1016/j.jcrysgro.2025.128394","DOIUrl":"10.1016/j.jcrysgro.2025.128394","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"673 ","pages":"Article 128394"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145464603","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

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

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

{"title":"Elucidating the effect of environmental gas on sample temperature profile through heat transfer modeling of an optical floating zone crystal-growth furnace","authors":"Eymana Maria , Jonathan J. Denney , Yusu Wang , Peter G. Khalifah , Katsuyo Thornton","doi":"10.1016/j.jcrysgro.2025.128389","DOIUrl":"10.1016/j.jcrysgro.2025.128389","url":null,"abstract":"<div><div>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 <em>in situ</em> 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.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"673 ","pages":"Article 128389"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145464653","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

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

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

{"title":"Numerical simulation study on the influence of process parameters of a horizontal CVD furnace on the deposition thickness and uniformity of ZnS","authors":"Yunhao Yang , Qiangguo Deng , Wenyuan Mao , Sushan Yuan , Yong Zhou , Pingyang Yu","doi":"10.1016/j.jcrysgro.2025.128393","DOIUrl":"10.1016/j.jcrysgro.2025.128393","url":null,"abstract":"<div><div>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 H<sub>2</sub>S/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/H<sub>2</sub>S 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.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"673 ","pages":"Article 128393"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145464601","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

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

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

{"title":"Growth of ultra-clean oxide single crystals of the altermagnet candidate RuO2","authors":"Shubhankar Paul , Giordano Mattoni , Hisakazu Matsuki , Thomas Johnson , Chanchal Sow , Shingo Yonezawa , Yoshiteru Maeno","doi":"10.1016/j.jcrysgro.2025.128405","DOIUrl":"10.1016/j.jcrysgro.2025.128405","url":null,"abstract":"<div><div>We report the details of the growth of ultra-clean oxide single crystals of RuO<sub>2</sub>, 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 <span><math><mrow><mn>10</mn><mo>×</mo><mn>5</mn><mo>×</mo><mn>2</mn><mspace></mspace><msup><mrow><mi>mm</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span> 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 <span><math><mrow><mn>30</mn><mspace></mspace><mi>n</mi><mi>Ω</mi><mi>cm</mi></mrow></math></span> 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 RuO<sub>2</sub> is paramagnetic.</div></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":"673 ","pages":"Article 128405"},"PeriodicalIF":2.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145464654","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