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Investigations of NiO‐CuO Solid Solutions Using Transmission Electron Microscopy: II, Evidence for Long‐Range Cation Order
Author(s) -
DAVIES P.K.
Publication year - 1986
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.1151-2916.1986.tb07363.x
Subject(s) - non blocking i/o , orthorhombic crystal system , transmission electron microscopy , solid solution , crystallography , superlattice , short range order , materials science , cationic polymerization , chemistry , crystal structure , nanotechnology , metallurgy , biochemistry , optoelectronics , polymer chemistry , catalysis
Further studies of rock salt solid solutions in the (Ni x Cu 1‐ x )O system have given direct structural evidence of long‐range cation order. Using transmission electron microscopy a structural modulation has been observed at high NiO concentration, x < 0.85, and superlattice reflections and fringes confirmed the formation of an ordered compound Ni 2 CuO 3 . The cationic arrangement in Ni 2 CuO 3 is analogous to the atomic arrangement in the alloy Ni 2 V The proposed structure is orthorhombic with a = a cubic /√2, b = 3a cubic /√2, and c = a cubic , and it shows considerable microtwinning. The arrangement of cations is compared to that in Cu 2 MgO 3 and these two compounds are found to be closely related. The structural models are discussed in terms of the energetics of the (Ni x , Cu 1‐ x )O system. The behavior of CuO‐MO systems, containing Ni 2+ , is compared and contrasted to that in the Co and Mg systems.