Microwave dielectric properties of Bi-substituted La(Mg1/2Ti1/2)O-3


The system La(Mg1/2Ti1/2)O-3-Bi(Mg1/2Ti1/2)O-3 (LMT-BMT) was investigated in respect to formation of perovskite solid solutions based on lanthanum magnesium titanate. Single-phase perovskite (1 - x)LMT-xBMT ceramics (0 <= x <= 0.3) were prepared and their crystal structure and dielectric properties were studied. It has been found that within the solubility range the crystal structure of Bi-substituted LMT remains monoclinic, P2(1)/n. Unit cell volume was evaluated to be almost independent on x, varying within the experimental error. Relative permittivity of the ceramics increases by almost a factor of 3 in the range 0 <= x <= 0.3 and its value is 40-45 at the compositional region where temperature coefficient of the resonant frequency passes a zero-value. Compositional and temperature variations of the dielectric parameters for LMT-BMT estimated at different frequency ranges are considered in comparison with those observed in other Bi-substituted ceramics based on LMT. (C) 2006 Elsevier Ltd. All rights reserved.




Materials Science


Salak, AN; Ferreira, VM

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