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Insights into the polymorphism of Bi2W2O9: single crystal growth and a complete survey of the variable-temperature thermal and dielectric properties†
CrystEngComm ( IF 2.6 ) Pub Date : 2018-03-22 00:00:00 , DOI: 10.1039/c8ce00189h Xiangxin Tian 1, 2, 3, 4 , Zeliang Gao 1, 2, 3, 4 , Feifei Chen 1, 2, 3, 4 , Qian Wu 1, 2, 3, 4 , Conggang Li 1, 2, 3, 4 , Weiqun Lu 1, 2, 3, 4 , Youxuan Sun 1, 2, 3, 4 , Xutang Tao 1, 2, 3, 4
CrystEngComm ( IF 2.6 ) Pub Date : 2018-03-22 00:00:00 , DOI: 10.1039/c8ce00189h Xiangxin Tian 1, 2, 3, 4 , Zeliang Gao 1, 2, 3, 4 , Feifei Chen 1, 2, 3, 4 , Qian Wu 1, 2, 3, 4 , Conggang Li 1, 2, 3, 4 , Weiqun Lu 1, 2, 3, 4 , Youxuan Sun 1, 2, 3, 4 , Xutang Tao 1, 2, 3, 4
Affiliation
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Bismuth layered Aurivillius oxides have attracted longstanding research interest due to their unique structural characteristics and outstanding performance in ferroelectric dielectrics. The complex phase evolution process as a function of temperature and pressure in this family also provides fascinating platforms for understanding the chemical origin of their versatility. Herein, high-quality single crystals of a bismuth layered Aurivillius oxide, Bi2W2O9, with dimensions up to 29 × 23 × 11 mm3 were successfully grown via the top-seeded solution growth (TSSG) method using a mixture of WO3 and Li2B4O7 as a flux. The material crystallizes in an unexpected centrosymmetric orthorhombic Pbcn (no. 60) space group with unit cell parameters a = 23.705(2), b = 5.4148(6), and c = 5.4345(6) Å. A complete survey of the anisotropic and variable-temperature thermal and dielectric properties was carried out with the aim of gaining detailed insights into their polymorphism evolution process. The results demonstrate that, with increasing temperature, the compound undergoes complicated phase transitions and, by analogy, signatures of the transitions are summarized and compared with those in Bi2WO6 and Bi2MoO6. The phase sequences and transition mechanisms of Bi2W2O9 are proposed by careful inspection and estimation.
中文翻译：
洞悉Bi 2 W 2 O 9的多态性：单晶生长以及对可变温度的热和介电性能的完整调查†
铋层状Aurivillius氧化物因其独特的结构特性和在铁电介质中的出色性能而吸引了长期的研究兴趣。在这个家族中，复杂的相演化过程是温度和压力的函数，这也为理解其多功能性的化学来源提供了引人入胜的平台。在此，通过顶部混合溶液生长（TSSG）方法，使用以下材料的混合物成功地生长了尺寸最大为29×23×11 mm 3的铋层状Aurivillius铋的高质量单晶Bi 2 W 2 O 9。 WO 3和Li 2 B 4 O 7作为通量。该材料在单元格参数为a = 23.705（2），b = 5.4148（6）和c = 5.4345（6）的意外中心对称正交Pbcn（第60号）空间群中结晶。进行了各向异性和可变温度的热和介电性能的完整调查，目的是获得对其多态性演变过程的详细了解。结果表明，随着温度的升高，该化合物经历复杂的相变，并且类似地，总结了这些转变的特征并将其与Bi 2 WO 6和Bi 2 MoO 6中的特征进行比较。。通过仔细的检查和估计，提出了Bi 2 W 2 O 9的相序和跃迁机理。
更新日期：2018-03-22
中文翻译：
洞悉Bi 2 W 2 O 9的多态性：单晶生长以及对可变温度的热和介电性能的完整调查†
铋层状Aurivillius氧化物因其独特的结构特性和在铁电介质中的出色性能而吸引了长期的研究兴趣。在这个家族中，复杂的相演化过程是温度和压力的函数，这也为理解其多功能性的化学来源提供了引人入胜的平台。在此，通过顶部混合溶液生长（TSSG）方法，使用以下材料的混合物成功地生长了尺寸最大为29×23×11 mm 3的铋层状Aurivillius铋的高质量单晶Bi 2 W 2 O 9。 WO 3和Li 2 B 4 O 7作为通量。该材料在单元格参数为a = 23.705（2），b = 5.4148（6）和c = 5.4345（6）的意外中心对称正交Pbcn（第60号）空间群中结晶。进行了各向异性和可变温度的热和介电性能的完整调查，目的是获得对其多态性演变过程的详细了解。结果表明，随着温度的升高，该化合物经历复杂的相变，并且类似地，总结了这些转变的特征并将其与Bi 2 WO 6和Bi 2 MoO 6中的特征进行比较。。通过仔细的检查和估计，提出了Bi 2 W 2 O 9的相序和跃迁机理。
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