The structures of the equiatomic stannides RE RhSn with the smaller rare earth elements Y, Gd-Tm and Lu were reinvestigated on the basis of temperature-dependent single crystal X-ray diffraction data. GdRhSn crystallizes with the aristotype ZrNiAl at 293 and 90 K. For RE = Y, Tb, Ho and Er the HP-CeRuSn type (approximant with space group R 3 m ) is already formed at room temperature, while DyRhSn adopts the HP-CeRuSn type below 280 K. TmRhSn and LuRhSn show incommensurate modulated variants with superspace groups P 31 m (1/3; 1/3; γ ) 000 (No. 157.1.23.1) ( γ = 3/8 for TmRhSn and γ = 2/5 for LuRhSn). The driving force for superstructure formation (modulation) is a strengthening of Rh–Sn bonding. The modulation is expressed in a 119 Sn Mössbauer spectrum of DyRhSn at 78 K through line broadening.

中文翻译：

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RERhSn中温度诱导的结构相变（RE = Y，Gd-Tm，Lu）

根据与温度有关的单晶X射线衍射数据，对具有较小稀土元素Y，Gd-Tm和Lu的等原子硫化锡RE RhSn的结构进行了研究。GdRhSn在293和90 K时结晶为贵族型ZrNiAl。对于RE = Y，Tb，Ho和Er，在室温下已形成HP-CeRuSn型（近似于空间群R 3 m），而DyRhSn采用HP-CeRuSn类型低于280 K.TmRhSn和LuRhSn显示了超空间群P 31 m（1/3; 1/3;γ）000（No. 157.1.23.1）的不相称调制变体（TmRhSn的γ= 3/8和γ= 2 / LuRhSn为5）。上层结构形成（调制）的驱动力是增强Rh-Sn键。通过线展宽，在78 K的DyRhSn的119 SnMössbauer光谱中表示调制。