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Abstract <p>Three borosilicates with the general formula of <i>REE</i><sub>3</sub>BSi<sub>2</sub>O<sub>10</sub> (<i>REE</i> = 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, <i>Pbca</i> space group) have similar, nearly isotropic thermal expansion in the whole temperature range; the average coefficients of thermal expansion (CTE) were: 〈α<sub><i>a</i></sub>〉 = 9.6, 〈α<sub><i>b</i></sub>〉 = 8.3 and 〈α<sub><i>c</i></sub>〉 = 8.7 × 10<sup>–6</sup>°С<sup>–1</sup>, with (α<sub>max</sub> – α<sub>min</sub>) ≤ 1.2 × 10<sup>–6</sup>°С<sup>–1</sup>. 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<sup>–6</sup>°С<sup>–1</sup> for Nd compound while the unit cell volume increases with increasing the <i>REE</i> cation radii in the <i>REE</i><sub>3</sub>BSi<sub>2</sub>O<sub>10</sub> series.</p>

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

  • 期刊论文

  • 发表日期：

    2025年6月1日

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

摘要

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: 〈αa〉 = 9.6, 〈αb〉 = 8.3 and 〈αc〉 = 8.7 × 10–6°С–1, with (αmax – αmin) ≤ 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.