Can I read Ge~40.0~Te~5.3~I~8~: synthesis, crystal structure, and properties of a new clathrate-I compound on EtoBox?

Ge~40.0~Te~5.3~I~8~: synthesis, crystal structure, and properties of a new clathrate-I compound by Kirill A. Kovnir; Nikolay S. Abramchuk; Julia V. Zaikina; Michael Baitinger; Ulrich Burkhardt; Walter Schnelle; Andrei V. Olenev; Oleg I. Lebedev; Gustaaf Van Tendeloo; Evgeny V. Dikarev; Andrei V. Shevelkov is a Chemistry article available to read on EtoBox.

What is Ge~40.0~Te~5.3~I~8~: synthesis, crystal structure, and properties of a new clathrate-I compound about?

## Abstract A new clathrate phase with the composition Ge~40.0~Te~5.3~I~8~ has been prepared and its structure determined from single crystal X-ray data. It crystallizes in the cubic space group __Pm__-3__n__ with unit cell parameter __a__ = 10.815(1) Å and __Z__ = 1 (__R__ = 0.031 for 272 independent reflections and 19 variables). Germanium and tellurium form a cationic clathrate framework hosting the guest iodine anions in cages of two different shapes. The cationic framework features a joint occupation on two of the three independent sites by germanium and tellurium, leading to the formation of Ge—Ge and Ge—Te bonds and vacancies on the third position. Electron diffraction and high-resolution electron microscopy reveal that the bulk material is not uniform; it contains domains showing a tendency for segregation of tellurium and germanium within the 4-fold positions of the space group __P__23, which is a subgroup of __Pm__-3__n__. Ge~40.0~Te~5.3~I~8~ is a diamagnetic semiconductor with a band gap of about 0.8 eV and its composition agrees with the Zintl formalism for the charge-balanced compounds.

Who reads Ge~40.0~Te~5.3~I~8~: synthesis, crystal structure, and properties of a new clathrate-I compound?

Author

Kirill A. Kovnir; Nikolay S. Abramchuk; Julia V. Zaikina; Michael Baitinger; Ulrich Burkhardt; Walter Schnelle; Andrei V. Olenev; Oleg I. Lebedev; Gustaaf Van Tendeloo; Evgeny V. Dikarev; Andrei V. Shevelkov

Publisher

Walter de Gruyter GmbH

Published

2006

Language

EN

Field

Chemistry (Physical Sciences)