Pyrochlore based oxides with high dielectric constant and low te

Details Pyrochlore based oxides with high dielectric constant and low te Pyrochlore based oxides with high dielectric constant and low te

1995-10-03

1997-08-19

Jones, Deborah

Compositions

Piezoelectric

501136, C04B 3546

Patent

active

056584857

ABSTRACT:
The temperature dependent dielectric constants in the vicinity of room temperature have been measured for bulk ceramics which are phase-mixtures of Pb.sub.2 (Nb,Mg,Ti).sub.2 O.sub.6+x pyrochlores and Pb(Nb,Mg,Ti)O.sub.3 perovskites. A band of compositions has been found in which the negative temperature coefficient of dielectric constant for the pyrochlore is very closely compensated by the positive temperature coefficient of dielectric constant of the perovskite. These compositions have dielectric constants near 200, with Q's near 200 at 1 MHz, making them an intermediate family of dielectrics between the much studied high dielectric constant low Q Barium-Strontium Titanates and low dielectric constant high Q Barium-Lanthanide Titanates.

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