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Electrical, X‐Ray, and Thermal Expansion Studies in the System KNbO 3 ‐AgNbO 3
Author(s) -
WEIRAUCH DONALD F.,
TENNERY VICTOR J.
Publication year - 1967
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1967.tb15027.x
Subject(s) - solid solution , potassium niobate , ferroelectricity , materials science , binary system , thermal expansion , permittivity , analytical chemistry (journal) , mineralogy , chemistry , binary number , dielectric , composite material , optoelectronics , metallurgy , chromatography , arithmetic , mathematics
Unlike the KNbO 3 ‐NaNbO 3 system, the KNbO 3 ‐AgNbO 3 system possessed a very limited degree of solid solution between its end‐members. Solid solution of AgNbO 3 in KNbO 3 was limited to slightly less than 6 mole %, and solid solution of KNbO 3 in AgNbO 3 was limited to less than 0.5 mole %. Because of a tendency for the K 1‐ x Ag x NbO 3 system to lose oxygen spontaneously during firing when 0.06 ≤ x ≤ 0.995, the system could not be treated as a true binary system. The compositions in the KNbO 3 solid solution region (0 ≤ x < 0.06) were ferroelectric at room temperature. Lattice parameter, relative permittivity, and thermal expansion measurements were made on specimens in the region 0 ≤ x ≤ 0.06.