TY - CHAP
T1 - Crystal chemistry of complex perovskites
T2 - New cation-ordered dielectric oxides
AU - Davies, P. K.
AU - Wu, H.
AU - Borisevich, A. Y.
AU - Molodetsky, I. E.
AU - Farber, L.
PY - 2008
Y1 - 2008
N2 - The crystal chemistry of complex perovskite dielectric oxides is reviewed, with an emphasis on structures derived from ordering of the cations on the octahedral B-sites. New classes of perovskites, designed to exhibit 1:2 or 1:3 B-site order for application as low-dielectric-loss microwave ceramics, are identified, and their synthesis, structure, and properties are described. Through the use of B-site chemistries based on Li, Nb, Ta, Ti, and W, members of four new families with 1:2 order, A(β1/3Iβ 2/3II)O3, and three new families with 1:3 order, A(β1/4Iβ3/4 II)O3, were successfully prepared. The formation and stability of the new and previously prepared ordered perovskites are rationalized through the use of familiar crystal chemical tools such as cation size and charge difference, bond valence, tolerance factor, and new concepts related to the local charge imbalance on the A- and B-sublattices. These tools can be successfully applied to develop stability field maps for each structure and to predict other new ordered systems.
AB - The crystal chemistry of complex perovskite dielectric oxides is reviewed, with an emphasis on structures derived from ordering of the cations on the octahedral B-sites. New classes of perovskites, designed to exhibit 1:2 or 1:3 B-site order for application as low-dielectric-loss microwave ceramics, are identified, and their synthesis, structure, and properties are described. Through the use of B-site chemistries based on Li, Nb, Ta, Ti, and W, members of four new families with 1:2 order, A(β1/3Iβ 2/3II)O3, and three new families with 1:3 order, A(β1/4Iβ3/4 II)O3, were successfully prepared. The formation and stability of the new and previously prepared ordered perovskites are rationalized through the use of familiar crystal chemical tools such as cation size and charge difference, bond valence, tolerance factor, and new concepts related to the local charge imbalance on the A- and B-sublattices. These tools can be successfully applied to develop stability field maps for each structure and to predict other new ordered systems.
KW - Cation ordering
KW - Microwave ceramics
KW - Niobates
KW - Tantalates
KW - Titanates
UR - http://www.scopus.com/inward/record.url?scp=50249153092&partnerID=8YFLogxK
U2 - 10.1146/annurev.matsci.37.052506.084356
DO - 10.1146/annurev.matsci.37.052506.084356
M3 - Chapter
AN - SCOPUS:50249153092
SN - 9780824317386
T3 - Annual Review of Materials Research
SP - 369
EP - 401
BT - Annual Review of Materials Research
A2 - Clarke, David
A2 - Ruehle, Manfred
A2 - Tomsia, Antoni
ER -