High-Pressure Synthesis, Electron Energy-Loss Spectroscopy Investigations, and Single Crystal Structure Determination of a Spinel-Type Gallium Oxonitride Ga2.79□0.21(O3.05N0.76□0.19)

被引：30

作者：

Huppertz, Hubert ^{[1
]}

Hering, Stefanie A. ^{[2
]}

Zvoriste, Carmen E. ^{[3
]}

Lauterbach, Stefan ^{[3
]}

Oeckler, Oliver ^{[2
]}

Riedel, Ralf ^{[3
]}

Kinski, Isabel ^{[4
]}

机构：

[1] Leopold Franzens Univ Innsbruck, Inst Allgemeine Anorgan & Theoret Chem, A-6020 Innsbruck, Austria

[2] Univ Munich, Dept Chem & Biochem, D-81377 Munich, Germany

[3] Tech Univ Darmstadt, Fachbereich Mat & Geowissensch, D-64287 Darmstadt, Germany

[4] Fraunhofer Inst Keram Technol & Syst, D-01277 Dresden, Germany

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 10期

关键词：

VACANCY DISTRIBUTION; ALUMINUM OXYNITRIDE; OXIDE; SYSTEM; ALN-AL2O3; HISTORY; ALON;

D O I：

10.1021/cm803371k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Under high-pressure/high-temperature conditions of 5 GPa and 1250 degrees C, the cubic phase Ga-2.79 square(0.21)(O3.05N0.76 square(0.19)) (square = vacancy) was synthesized in a Walker-type multianvil apparatus. For the first time, the crystal structure of a gallium oxonitride was determined on the basis of single crystal X-ray diffraction data. The cubic spinel-type gallium oxonitride crystallizes in the space group Fd ($) over barm (No. 227) with a lattice parameter a(0) = 827.8(2) pm. The combination of energy-dispersive X-ray spectroscopy (EDS) with electron energy-loss spectroscopy (EELS) allowed the quantification of nitrogen and oxygen for structural refinement. In the literature dealing with oxonitrides, crystal defects in spinel-type materials are handled with different models, mainly the approximation of a constant anion model. The present results indicate that this model is questionable, and one should also take into account a model with both cation and anion vacancies. Furthermore, a linear relationship between the lattice parameters and the ratio N/O in the gallium oxonitrides is questionable.

引用

页码：2101 / 2107

页数：7