High-Pressure High-Temperature Crystallization of GaN: Modeling and Experimental Studies

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Superhard Materials Pub Date : 2026-03-04 DOI:10.3103/S1063457626010144

O. P. Liudvichenko, O. O. Lyeshchuk, I. A. Petrusha, S. O. Gordieiev, B. S. Sadovyi, P. S. Sadovyi, Yu. I. Sadova, A. S. Nikolenko, V. Z. Turkevych, S. Porowski, I. Grzegory

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Abstract

Using computational modeling, we optimized the resistive heating process of the high-pressure apparatus (HPA) cell designed for the growth of GaN crystals from the Fe–Ga–N solution-melt under high-pressure and high-temperature (HPHT) conditions via the temperature gradient method. The thermal state of the apparatus was simulated by solving the coupled electro- and heat-conduction problem using the finite element method. Modeling determined the spatial distribution of temperature and temperature gradient within the experimental cell. As a result of computational optimization of the thermal state of the toroid-40 type HPA cell, polycrystalline GaN was synthesized from the Fe–Ga–N solution-melt. Reducing the axial temperature gradient in the crystallization volume from 13 to 1.5°C/mm produced the growth of petal-shaped GaN single crystals. Observed crystal growth rates varied from 40 to 250 µm/h.

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氮化镓高压高温结晶：模拟与实验研究

利用计算模型，通过温度梯度法优化了Fe-Ga-N溶液熔体在高压高温条件下生长GaN晶体的高压装置（HPA）电池的电阻加热过程。采用有限元法求解电热传导耦合问题，对装置的热状态进行了模拟。模拟确定了实验单元内温度的空间分布和温度梯度。通过对toroid-40型HPA电池热态的计算优化，在Fe-Ga-N溶液熔体中合成了多晶GaN。将结晶体积的轴向温度梯度从13°C/mm降低到1.5°C/mm，生长出花瓣状GaN单晶。观察到的晶体生长速率为40 ~ 250µm/h。

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来源期刊

Journal of Superhard Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.80

自引率

66.70%

发文量

审稿时长

2 months

期刊介绍： Journal of Superhard Materials presents up-to-date results of basic and applied research on production, properties, and applications of superhard materials and related tools. It publishes the results of fundamental research on physicochemical processes of forming and growth of single-crystal, polycrystalline, and dispersed materials, diamond and diamond-like films; developments of methods for spontaneous and controlled synthesis of superhard materials and methods for static, explosive and epitaxial synthesis. The focus of the journal is large single crystals of synthetic diamonds; elite grinding powders and micron powders of synthetic diamonds and cubic boron nitride; polycrystalline and composite superhard materials based on diamond and cubic boron nitride; diamond and carbide tools for highly efficient metal-working, boring, stone-working, coal mining and geological exploration; articles of ceramic; polishing pastes for high-precision optics; precision lathes for diamond turning; technologies of precise machining of metals, glass, and ceramics. The journal covers all fundamental and technological aspects of synthesis, characterization, properties, devices and applications of these materials. The journal welcomes manuscripts from all countries in the English language.