CRYSTALLIZATION OF BORON-NITRIDE FROM SOLUTION IN A LITHIUM BORATE MELT

Authors
OSTROVSKAYA NF BARTNITSKAYA TS LYASHENKO VI ZELYAVSKII VB KURDYUMOV AV
Citation
Nf. Ostrovskaya et al., CRYSTALLIZATION OF BORON-NITRIDE FROM SOLUTION IN A LITHIUM BORATE MELT, Powder metallurgy and metal ceramics, 35(11-12), 1996, pp. 636-639
Citations number
8
Categorie Soggetti
Material Science, Ceramics","Metallurgy & Metallurigical Engineering
Journal title
Powder metallurgy and metal ceramics → ACNP
ISSN journal
10681302
Volume
35
Issue
11-12
Year of publication
1996
Pages
636 - 639
Database
ISI
SICI code
1068-1302(1996)35:11-12<636:COBFSI>2.0.ZU;2-2
Abstract
We have investigated the reaction between disordered (turbostratic) bo ron nitride and lithium carbonate under a nitrogen atmosphere using x rays and electron microscopy. Lithium borate and cyanamide, were found to be the reaction products at a temperature of 650 degrees C. Sponta neous crystallization of highly ordered graphitic boron nitride occurs from solution in a melt of lithium berates at 1000 degrees C. Three-d imensional ordering and crystal size increase with elevation of the te mperature to 1450 degrees C.