Phase transformation of germanium nitride (Ge3N4) under shock wave compression

Citation
Hl. He et al., Phase transformation of germanium nitride (Ge3N4) under shock wave compression, J APPL PHYS, 90(9), 2001, pp. 4403-4406
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
0021-8979 → ACNP
Volume
90
Issue
9
Year of publication
2001
Pages
4403 - 4406
Database
ISI
SICI code
0021-8979(20011101)90:9<4403:PTOGN(>2.0.ZU;2-C
Abstract
The phase transformation behavior of hexagonal germanium nitride, including both alpha- and beta -Ge3N4, has been studied under shock wave compression . The shock compressed quenched samples indicate phase transformation from hexagonal into a cubic spinel structure (gamma -Ge3N4). This transformation is completed with increasing shock pressure up to 40-46 GPa (temperature o f 1300-1500 K). The lattice constant of gamma -Ge3N4 is measured to be 0.82 0 63 +/-0.000 19 nm, and the crystal density 6.581 g/cm3, by the powder x-r ay diffraction. The stability of gamma -Ge3N4 also has been investigated un der shock wave compression. It is found that the spinel structure is very s table, and up to at least 63 GPa (temperature of similar to 1700 K) there i s no indication of the formation of a postspinel phase. (C) 2001 American I nstitute of Physics.