Thermal Expansion of Oxoborogermanate Sm14(GeO4)2(BO3)6O8

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, CERAMICS Glass Physics and Chemistry Pub Date : 2025-03-23 DOI:10.1134/S1087659624600650

N. V. Sukachev, A. P. Shablinskii, M. G. Krzhizhanovskaya, R. S. Bubnova

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Abstract

Thermal expansion of samarium oxoborogermanate Sm₁₄(GeO₄)₂(BO₃)₆O₈ is studied by the method of high temperature powder X-ray diffraction in the temperature range of 30–1200°C. The coefficients of thermal expansion are calculated: α₁₁ = 9.59(12), α_c = 7.56(13), α_V = 26.74(30) × 10^–6°C^–1 at 30°C; and α_a = 14.44(12), α_c = 10.74(13), α_V = 39.61(28) × 10^–6 °C^–1 at 1200°C. A structural interpretation of the anisotropy of thermal expansion is carried out. With increasing temperature, the degree of anisotropy remains practically unchanged, the structure expands minimally along the c axis, and maximally in the ab plane, perpendicular to the preferred orientation of the BO₃ triangles in the crystal structure. The melting point of Sm₁₄(GeO₄)₂(BO₃)₆O₈ is clarified.

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氧化锗酸盐Sm14(GeO4)2(BO3)6O8的热膨胀

采用高温粉末x射线衍射法研究了氧化锗钐Sm14(GeO4)2(BO3)6O8在30 ~ 1200℃范围内的热膨胀。计算了30℃时的热膨胀系数：α11 = 9.59(12), αc = 7.56(13), αV = 26.74（30） × 10-6℃- 1；α= 14.44(12),α= 10.74加元(13),αV = 39.61(28)×10 - 6°颈- 1在1200°c。对热膨胀的各向异性进行了结构解释。随着温度的升高，各向异性的程度基本保持不变，结构沿c轴扩展最小，在ab平面扩展最大，垂直于晶体结构中BO3三角形的优选方向。澄清了Sm14(GeO4)2(BO3)6O8的熔点。

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来源期刊

Glass Physics and Chemistry 工程技术-材料科学：硅酸盐

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Glass Physics and Chemistry presents results of research on the inorganic and physical chemistry of glass, ceramics, nanoparticles, nanocomposites, and high-temperature oxides and coatings. The journal welcomes manuscripts from all countries in the English or Russian language.