Cationic Clathrate of Type-III Ge172鈥?i>xPxTey (y 鈮?21.5, x 鈮?2y): Synthesis, Crystal Structure and Thermoelectric Properties

详细信息    查看全文

• 作者：Maria A. Kirsanova ; Takao Mori ; Satofumi Maruyama ; Artem M. Abakumov ; Gustaaf Van Tendeloo ; Andrei Olenev ; Andrei V. Shevelkov
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：July 15, 2013
• 年：2013
• 卷：52
• 期：14
• 页码：8272-8279
• 全文大小：390K
• 年卷期：v.52,no.14(July 15, 2013)
• ISSN：1520-510X

文摘

A first germanium-based cationic clathrate of type-III, Ge_129.3P_42.7Te_21.53, was synthesized and structurally characterized (space group P4₂/mnm, a = 19.948(3) 脜, c = 10.440(2) 脜, Z = 1). In its crystal structure, germanium and phosphorus atoms form three types of polyhedral cages centered with Te atoms. The polyhedra share pentagonal and hexagonal faces to form a 3D framework. Despite the complexity of the crystal structure, the Ge_129.3P_42.7Te_21.53 composition corresponds to the Zintl counting scheme with a good accuracy. Ge_129.3P_42.7Te_21.53 demonstrates semiconducting/insulating behavior of electric resistivity, high positive Seebeck coefficient (500 渭V K^鈥? at 300 K), and low thermal conductivity (<0.92 W m^鈥? K^鈥?) within the measured temperature range.