High-pressure/high-temperature synthesis of a new polymorphic series of lanthanoid cadmium borates, LnCdB6O10(OH)3 (Ln = Sm–Er)

Zeitschrift für Kristallographie - Crystalline Materials Pub Date : 2024-03-19 DOI:10.1515/zkri-2024-0063

Tobias A. Teichtmeister, Alexander Hugo Bernhart, Klaus Wurst, Gunter Heymann, Hubert Huppertz

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Abstract

We report on the synthesis, structure determination, and characterization of a new series of compounds LnCdB6O10(OH)3 (Ln = Sm–Er). Syntheses were carried out in a Walker-type multianvil device at 7 GPa and 650 °C. Structure determinations revealed the coexistence of an orthorhombic and a monoclinic polymorph, depending on the ionic radius of the lanthanoid cation. The orthorhombic structural variants crystallize non-centrosymmetrically in the space group Pna21 (no. 33), while the monoclinic modifications crystallize in space group P21/c (no. 14). Both modifications display a layered crystal structure built up by a repeating [B6O13]8− building block as their main structural feature.

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硼酸镧镉的新多晶型系列 LnCdB6O10(OH)3 （Ln = Sm-Er）的高压/高温合成

我们报告了一系列新化合物 LnCdB6O10(OH)3（Ln = Sm-Er）的合成、结构测定和表征。合成是在 7 GPa 和 650 ℃ 的沃克型多坩埚装置中进行的。结构测定结果表明，根据镧系阳离子的离子半径，正方体和单斜多晶体并存。正方晶结构变体在空间群 Pna21（编号 33）中以非中心对称方式结晶，而单斜晶变体则在空间群 P21/c（编号 14）中结晶。这两种变体的主要结构特征都是由重复的 [B6O13]8- 结构单元构建的层状晶体结构。

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Zeitschrift für Kristallographie - Crystalline Materials

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