Direct Transformation of Hexagonal Boron Nitride to Denser Forms

Autor:	F. P. Bundy, R. H. Wentorf
Rok vydání:	1963
Předmět:	Diffraction Materials science General Physics and Astronomy Crystal structure Catalysis chemistry.chemical_compound Crystallography chemistry Boron nitride Cubic form Crystallite Physical and Theoretical Chemistry Direct transformation Wurtzite crystal structure
Zdroj:	The Journal of Chemical Physics. 38:1144-1149
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1733815
Popis:	Hexagonal, graphitelike boron nitride may be changed directly into the zincblende cubic form reported earlier or into a new wurtzite form by the application of static high pressures. No catalyst appears to be necessary. At high temperatures, between about 2500° and 4000°K, the zincblende form is favored; at lower temperatures, down to 300°K, the wurtzite form is favored; frequently both forms appear together. The minimum pressure required for the transformations is about 115 kbar at 2000°K; somewhat higher pressures, of the order of 130 kbar, suffice at higher and lower temperatures. The crystallites of the dense phases are small but give good x‐ray diffraction patterns from which the crystal structures can be determined.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a19b5b6f0f5fe1c8c84cd0c7c81a742d https://doi.org/10.1063/1.1733815 Zobrazit plný text záznamu