EVALUATION OF A STATISTICAL THERMODYNAMIC METHOD FOR CALCULATING COMPOSITION DEPENDENCE OF CHEMICAL POTENTIALS IN NONSTOICHIOMETRIC ZIRCONIUM CARBIDE

被引：10

作者：

DEPOORTER, GL

机构：

[1] Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1969年 / 52卷 / 06期

关键词：

D O I：

10.1111/j.1151-2916.1969.tb11932.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mathematical expressions for carbon and zirconium activities in zirconium carbide are derived from a statistical thermodynamic model, on the assumption that nonstoichiometry is due to vacancies in the carbon sublattice while the zirconium sublattice remains filled. The energy term in the partition function is obtained by using a first‐ and second‐neighbor quasi‐chemical model. Values for the parameters used in the model are determined from available data as a function of composition. For C/Zr atom ratios between 0.59 and 0.85 the energy parameters are approximately composition‐independent, whereas in the composition range 0.85 to 0.99 they are strongly composition‐dependent. The vibrational partition functions of C and Zr in zirconium carbide are estimated and are shown to influence the value obtained for the model parameters. Copyright © 1969, Wiley Blackwell. All rights reserved

引用

页码：311 / +

页数：1

共 24 条

[1] THE CONDITIONS OF EQUILIBRIUM OF NON-STOICHIOMETRIC CHEMICAL COMPOUNDS
ANDERSON, JS
[J]. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1946, 185 (1000): : 69 - 89
[2] THERMAL EXPANSION OF NONSTOICHIOMETRIC ZIRCONIUM CARBIDES
ARONSON, S
CISNEY, E
AUSKERN, AB
[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1966, 49 (08) : 456 - &
[3] BOWMAN AL, PRIVATE COMMUNICATIO
[4] BOWMAN MG, 1966, HIGH TEMPERATURE ED, P297
[5] LOW-TEMPERATURE ELASTIC PROPERTIES OF ZRC AND TIC
CHANG, R
GRAHAM, LJ
[J]. JOURNAL OF APPLIED PHYSICS, 1966, 37 (10) : 3778 - &
[6] FOWLER R, 1960, STATISTICAL THERMODY, P541
[7] FOWLER R, 1960, STATISTICAL THERMODY, P557
[8] COOPERATIVE PHENOMENA IN PD-H SYSTEM .1.
HARASIMA, A
TANAKA, T
SAKAOKU, K
[J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1948, 3 (03) : 208 - 213
[9] Hill T.L., 1960, INTRO STATISTICAL TH, P89
[10] HOCH M, 1964, T METALL SOC AIME, V230, P138

← 1 2 3 →