| 摘要 |
Piezoelectric ceramic compositions having very high mechanical quality factors and electromechanical coupling coefficients and high stabilities in resonant frequency and mechanical quality factor over a wide temperature range comprising the solid solutions defined by the lines connecting points A, B, C, D and E and the lines connecting points F, G, H, I, J and K of the diagram of FIG. 2 and further containing from 0.1 to 5 percent of MnO2 . |
