Chemical Equilibria in the Titanium(ll) Hydride-Boron Nitride System
| Autor: | Ewa Benko |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Materials science
Hydride Analytical chemistry chemistry.chemical_element Order (ring theory) Mineralogy Atmospheric temperature range Gibbs free energy symbols.namesake chemistry.chemical_compound chemistry Boron nitride X-ray crystallography Materials Chemistry Ceramics and Composites symbols Tin Stoichiometry |
| Zdroj: | Journal of the American Ceramic Society. 78:685-688 |
| ISSN: | 1551-2916 0002-7820 |
| DOI: | 10.1111/j.1151-2916.1995.tb08233.x |
| Popis: | Calculations of chemical equilibria for the TiH{sub 2}-BN system using the Villars, Cruise, Smith (VCS) algorithm were carried out for the 27--2,027 C temperature range and the 1.3 {times} 10{sup {minus}3}--1 {times} 10{sup 7} Pa pressure range. Two BN:TiH{sub 2} molar ratios were selected, 1:1 and 2:1. It follows from these studies that TiH{sub 2} can react with BN in a very wide range of pressures and temperatures, giving new phases, namely TiB{sub 2}, TiB, and TiN. The formation of these phases is strongly influenced by pressure-temperature parameters. In order to verify theoretical calculations by experiment, equimolar and Z:1 BN:TiH{sub 2} batches were prepared and heated at 1,427 C under vacuum, in an argon atmosphere, and under high pressure. Phase identification carried out by X-ray diffraction fully corroborated the computational results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text