Accession Number:

ADA238080

Title:

Boron Nitride and Silicon Nitride Systems

Descriptive Note:

Final rept. Jun 90-Feb 91,

Corporate Author:

VIENNA UNIV (AUSTRIA)

Personal Author(s):

• Rogl, Peter
• Schuster, Julius C.

Report Date:

1991-02-01

Pagination or Media Count:

484.0

Abstract:

Information on phase equilibria and compound formation in the Li-B-N system all agree on the existence of a ternary compound Li3Bn2 with several pressure modifications. Heating powder compacts of Li3N BN in a Mo-boat in a stream of nitrogen between 650 to 700 C was claimed as optimal conditions to obtain Li3BN2 the reaction being strongly exothermic. Melting of Li3BN2 was reported at 870. Based on earlier preliminary data by the p-T diagram of Li3BN2 was investigated over the pressure and temperature range from 1.0 to 6.5 GPa and 300 to 1900 C employing optical and x-ray powder diffraction analysis.

Descriptors:

• *TEMPERATURE
• MODIFICATION
• OVERPRESSURE
• EQUILIBRIUM(GENERAL)
• BORON NITRIDES
• NITROGEN
• PRESSURE
• RANGE(EXTREMES)
• STREAMS
• SILICON NITRIDES
• OPTIMIZATION
• PHASE STUDIES

Subject Categories:

• Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE