Synthesis of [(SnSe)1.15]m(TaSe2)n Ferecrystals: Structurally Tunable Metallic Compounds

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• 作者：Ryan Atkins ; Jason Wilson ; Paul Zschack ; Corinna Grosse ; Wolfgang Neumann ; David C. Johnson
• 刊名：Chemistry of Materials
• 出版年：2012
• 出版时间：December 11, 2012
• 年：2012
• 卷：24
• 期：23
• 页码：4594-4599
• 全文大小：340K
• 年卷期：v.24,no.23(December 11, 2012)
• ISSN：1520-5002

文摘

A modification of the modulated elemental reactants synthetic technique was developed and used to synthesize eleven members of the [(SnSe)_1.15]_m(TaSe₂)_n family of compounds, with m and n equal to integer values between 1 and 6. Each of the intergrowth compounds contained highly oriented intergrowths of SnSe bilayers and TaSe₂ monolayers with abrupt interfaces perpendicular to the c-axis. The c-lattice parameter increased 0.579(1) nm per SnSe bilayer and 0.649(1) nm per Se鈥揟a鈥揝e trilayer (TaSe₂) as m and n were varied. ab-plane X-ray diffraction patterns and transmission electron microscope images revealed a square in-plane structure of the SnSe constituent, a hexagonal in-plane structure for the TaSe₂ constituent, and rotational disorder between the constituent layers. Temperature dependent electrical resistivity, measured on several specimens, revealed metallic behavior, and a simple model is presented to explain the differences in resistivity as a function of m and n.

Keywords:

ferecrystals; misfit layer compounds; self-assembly; modulated elemental reactants