Accession Number:

AD0700765

Title:

THERMODYNAMIC PROPERTIES OF TERNARY REFRACTORY CARBIDES. 1. ZIRCONIUM-NIOBIUM-CARBON.

Descriptive Note:

Technical rept. 1 Jul 67-30 Jun 69,

Corporate Author:

CINCINNATI UNIV OHIO

Personal Author(s):

• Jun,C. K.
• Hoch,M.

Report Date:

1969-12-01

Pagination or Media Count:

40.0

Abstract:

The non-stoichiometry of zirconium-niobium-carbide with the sodium-chloride type structure, ZrxNb1-xCy, was studied by measuring the activities of the components as a function of composition. The samples were prepared by heating the required amounts of oxides and graphite in a high-vacuum induction furnace. Lattice parameters were measured of all specimens. At constant carbon concentration y constant, the lattice parameter deviates from Vegards law at the niobium-rich end. The metal-metal interaction energy is not much different from that in the bcc metallic zirconium-niobium system. The difference between the zirconium-carbon and niobium-carbon interaction energies E13-E23 is linearly dependent on composition. Author

Descriptors:

• (*CARBIDES
• *CRYSTAL LATTICES)
• SOLID SOLUTIONS
• CHEMICAL BONDS
• THERMODYNAMICS
• ZIRCONIUM COMPOUNDS
• NIOBIUM COMPOUNDS
• PHASE STUDIES

Subject Categories:

• Physical Chemistry
• Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE