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Lattice parameters, thermal expansion coefficients and densities of Nb, and of solid solutions Nb–O and Nb–N–O and their defect structure
Author(s) -
Straumanis M. E.,
Zyszczynski S.
Publication year - 1970
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s002188987000554x
Subject(s) - thermal expansion , nitride , solid solution , lattice (music) , materials science , lattice constant , interstitial defect , oxygen , thermodynamics , oxygen atom , crystallography , chemistry , metallurgy , diffraction , nanotechnology , physics , molecule , optoelectronics , organic chemistry , layer (electronics) , doping , acoustics , optics
The temperature expansivities (by the X‐ray method), the densities and the defect structures of the 3 cubic nonstoichiometric compounds (solid solutions) of the composition Nb, NbO 0.017 and NbN 0.90 O 0.013 (nitride) were determined. The lattice parameters a at 25°C were: 3.3004, 3.3047 and 4.3855 Å; the linear expansion coefficients, α, between 15 and 65°C were 7.6, 8–65 and 7–75 × 10–6°C −1 respectively. As the temperature is increased, α undergoes several changes in magnitude. The cubic nitride started to decompose at about 850°, with a loss of N (decrease of α). The structure of the oxygen‐poor Nb is free from vacancies and interstitial atoms within the limits of error; that of the oxygen‐rich Nb contains interstitial atoms on additional sites in a concentration of 1.9%, and the nitride contains vacant sites in both sublattices (4.8% total).