...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Symmetry and twins in the monophosphate tungsten bronze series (PO2)(4)(WO3)(2m) (2 <= m <= 14)
【24h】

Symmetry and twins in the monophosphate tungsten bronze series (PO2)(4)(WO3)(2m) (2 <= m <= 14)

机译：单磷酸盐钨青铜系列（PO2）（4）（WO3）（2m）中的对称和孪生（2 <= m <= 14）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Monophosphate tungsten bronze with pentagonal tunnels (PO2)(4)(WO3)(2m) are low-dimensional materials with charge density wave (CDW)-type electron instabilities. Two forms of the structure can thus be expected for all the members of the series: a low-temperature form (LT) corresponding to the CDW state and a high-temperature form (HT) corresponding to a normal metallic state. The HT form is described here for m = 9 and compared with that of the m = 5 and m = 7 counterparts. It is shown that a systematic twin phenomenon must be taken into account for HT members because of two possible configurations of the tilting mode of WO6 octahedra. The structure is also compared with that of m = 10, which exhibits the modulated CDW-LT form at room temperature. Owing to two possible polarization directions of the segments built of m WO6 octahedra, a twin phenomenon is also encountered in the LT forms. A review of all the structures known at present (m = 2, 4, 5, 6, 7, 8, 9, 10, 12) leads us to propose a structural law based on the building mode of WO6 octahedra in WO3-type slabs to explain the symmetry changes observed between even and odd members of the series. [References: 65]
机译：具有五边形隧道（PO2）（4）（WO3）（2m）的单磷酸盐钨青铜是具有电荷密度波（CDW）型电子不稳定性的低维材料。因此，对于该系列的所有成员，可以预期两种形式的结构：对应于CDW状态的低温形式（LT）和对应于正常金属态的高温形式（HT）。 HT形式在此处针对m = 9进行了描述，并与m = 5和m = 7的对应形式进行了比较。结果表明，由于WO6八面体倾斜模式的两种可能的配置，HT成员必须考虑系统的孪生现象。还将该结构与m = 10的结构进行比较，后者在室温下表现出调制的CDW-LT形式。由于由m WO6八面体构成的链段的两个可能的极化方向，在LT形式中也遇到了孪生现象。回顾目前已知的所有结构（m = 2、4、5、6、7、8、9、10、12），使我们提出基于WO3八面体在WO3型平板中的建造模式的结构定律解释在该系列的偶数和奇数成员之间观察到的对称性变化。 [参考：65]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号