Corrigendum to: "Phase transitions in the hexagonal tungsten bronze RbNbW2O9" [J. Solid State Chem. 286 (2020) 121275]
Corrigendum to: "Phase transitions in the hexagonal tungsten bronze RbNbW2O9" [J. Solid State Chem. 286 (2020) 121275]
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勘误表：“六方钨青铜 RbNbW2O9 中的相变”[J.
DOI：
10.1016/j.jssc.2020.121548
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发表时间：
2020
影响因子：
3.3
通讯作者：
McNulty J
中科院分区：
文献类型：
--
作者：
McNulty J
通过变温粉末中子衍射和对称模式分析表明，六方钨青铜rbnbw2o9的相变顺序与csnbw2o9的相关成分有明显不同。室温下，rbnbw2o9采用极性正交空间群pcmc21。加热后，晶体结构的热演化经历两个转变。这对应于两个不同的八面体倾斜模式的顺序损失，导致空间群pp63mcat在655K附近，空间群pp6mmat在700k附近。极性畸变一直保持到这里所研究的最高温度。适当的铁电性rbnbw2o9和不适当的铁电性csnbw2o9在结构行为上的差异强调了对这类材料进行仔细的晶体学分析的必要性。
The hexagonal tungsten bronze RbNbW2O9is shown, by variable-temperature powder neutron diffraction and symmetry-mode analysis, to display a significantly different phase transition sequence compared to the related CsNbW2O9composition. At ambient temperature, RbNbW2O9adopts the polar orthorhombic space groupCmc21. Upon heating, the thermal evolution of the crystal structure proceedsviatwo transitions. These correspond to sequential loss of two distinct octahedral tilting modes, leading to space groupP63mcat around 655K, and space groupP6mmnear 700 K. The polar distortion is retained up to the highest temperature studied here. The differences in structural behaviour between the proper ferroelectric RbNbW2O9and the improper ferroelectric CsNbW2O9emphasises the need for careful crystallographic analyses of materials of this type.