Thermal Expansion of REE3BSi2O10 (REE = Nd, Eu, Gd) Borosilicates

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, CERAMICS

Glass Physics and Chemistry Pub Date : 2025-09-23 DOI:10.1134/S1087659624601278

Yu. O. Kopylova, M. G. Krzhizhanovskaya, V. A. Yukhno, R. S. Bubnova

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Abstract

Three borosilicates with the general formula of REE₃BSi₂O₁₀ (REE = Nd, Eu, Gd) were obtained by the high-temperature solid-state synthesis and studied by powder high-temperature X-ray diffraction (HTXRD) in the temperature range from 30 up to 1050°C. The HTXRD study showed that these borosilicates (orthorhombic, Pbca space group) have similar, nearly isotropic thermal expansion in the whole temperature range; the average coefficients of thermal expansion (CTE) were: 〈α_a〉 = 9.6, 〈α_b〉 = 8.3 and 〈α_c〉 = 8.7 × 10^–6°С^–1, with (α_max – α_min) ≤ 1.2 × 10^–6°С^–1. The average volume CTE insignificantly decreases with increasing the cation size from 27.2 for Eu and 27.0 for Gd down to 25.8 × 10^–6°С^–1 for Nd compound while the unit cell volume increases with increasing the REE cation radii in the REE₃BSi₂O₁₀ series.

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REE3BSi2O10 （REE = Nd, Eu, Gd）硼硅酸盐的热膨胀

采用高温固相合成法制备了三种分子式为REE3BSi2O10 （REE = Nd, Eu, Gd）的硼硅酸盐，并在30 ~ 1050℃的温度范围内进行了粉末高温x射线衍射（HTXRD）研究。HTXRD研究表明，这些硼硅酸盐（正交、Pbca空间群）在整个温度范围内具有相似的、几乎各向同性的热膨胀；平均热膨胀系数(CTE) < αa > = 9.6, < αb > = 8.3, < αc > = 8.7 × 10-6°С-1, (αmax - αmin)≤1.2 × 10-6°С-1。在REE3BSi2O10系列中，平均体积CTE随阳离子尺寸的增大而减小，从Eu的27.2和Gd的27.0减小到Nd的25.8 × 10-6°С-1，而单元胞体积随REE阳离子半径的增大而增大。

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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.