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.

中文翻译：

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高压/高温合成一系列新的多晶型镧系硼酸镉，LnCdB6O10(OH)3 (Ln = Sm–Er)

我们报告一系列新化合物的合成、结构测定和表征熔点分贝6氧10（哦）3（熔点= Sm-Er）。合成在 Walker 型多砧装置中在 7 GPa 和 650 °C 下进行。结构测定揭示了斜方晶型和单斜晶型的共存，具体取决于镧系元素阳离子的离子半径。斜方结构变体在空间群中非中心对称结晶普纳21（第 33 号），而单斜晶系变体在空间群中结晶磷21/C（第 14 号）。两种修饰都显示出由重复的[B6氧13]8−积木作为其主要结构特征。