Thermodynamic properties and crystal structures of nonstoichiometric niobium selenides NbSe/x/ for x = 1.48-2.00
Abstract
The pressure-composition-temperature relations for niobium selenides NbSe(x) were determined by annealing the sample under controlled selenium vapor pressure in the composition range x = 1.48-2.00. There exist five phases: Nb2Se3, 2H(a), 3R, 2H(beta) and 4H. The 2H(a) and 3R phase are known to be stable over a wide range of nonstoichiometric composition; the 2H(beta) and 4H phases have an extremely narrow range at composition x = 2.00. The defect structures of 2H(a) and 3R phases were analyzed using statistical thermodynamics.
- Publication:
-
Japan Institute of Metals Journal
- Pub Date:
- May 1979
- Bibcode:
- 1979JaIMJ..41..837I
- Keywords:
-
- Crystal Structure;
- Metal Crystals;
- Niobium Compounds;
- Selenides;
- Thermodynamic Properties;
- Annealing;
- Metal Vapors;
- Single Crystals;
- Vapor Pressure;
- X Ray Diffraction;
- Solid-State Physics