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The sequence of structure transformations, P2
1
/n − I2/m − Fm
m, involving oxygen octahedral tilting has been revealed in the ceramics of the whole-range B-site ordered perovskite system (1−x)La(Mg
1/2
Ti
1/2
)O
3
−xBa(Mg
1/2
W
1/2
)O
3
. Microwave dielectric characteristics of the ceramics have been evaluated as a function of their composition. The observed structure sequence and structure-dependent dielectric behavior are discussed in respect to an order of the transition between anti-phase tilted and untilted configurations as well as a likely clustering in the system.
Acknowledgments
The authors acknowledge the Foundation for Science and Technology (FCT; Portugal) for their financial support through the grants SFRH/BPD/12669/2003 and SFRH/BPD/ 14988/2004.
Paper originally presented at IMF-11, Iguassu Falls, Brazil, September 5–9, 2005.