Studies on Pb(Zr-Ti)O_3 Ceramics with Addition of Cr_2O_3

概要

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The solubility limit of Cr_2O_3 into Pb(Zr-Ti)O_3 was determined as about 2.2 mole % of 1/2Cr_2O_3. In a region out of the limit, three phases were found; the perovskite-type solid solution, the baddeleyite-type ZrO_2 and 2PbO・CrO_3. By additions of Cr_2O_3 within the limit, the tetragonality or the difference of rhombohedral angle from π/2 is decreased, and the Curie point is lowered. The temperature, bias and aging characteristics of the piezoelectric ceramics with Cr additives were measured. The temperature coefficient of frequency constant decreases with Cr concentration. The temperature coefficient of frequency constant decreases with Cr concentration. The addition of Cr_2O_3 decreases the dielectric and elastic anisotropies, and increases the coercive field. The remanent electrostriction if notably large compared with that in the plain Pb(Zr-Ti)O_3 ceramics. The back-rotation of 90°-rotated domains with time tends to play a significant role in the ceramics with Cr additives, and this is considered as one of the reasons for the improved time stability in this system.
社団法人応用物理学会の論文
1967-11-05