| 摘要 |
PROBLEM TO BE SOLVED: To obtain a piezoelectric ceramic material having a proper electromechanical coupling coefficient and mechanical quality factor, showing excellent characteristics of temperature stability of mechanical quality factor and resonance frequency, consequently providing an inexpensive high-precision piezoelectric vibration gyroscope drivable at a low voltage. SOLUTION: This piezoelectric ceramic material is shown by the compositional formula: Fb[(Mna Sb1-b )b Tic Zrd ]O3 in which (a), (b), (c) and (d) satisfy relations of 0.333<a<=0.60, 0.01<=b<=0.22, 0.19<=c<=0.61, 0.35<=d<=0.58 and b+c+d=1, respectively. Preferably a×b>0.012. Further a piezoelectric ceramic material comprises a main component composed of the piezoelectric ceramic material and at least one of (e) wt.% of Ln2 O3 (with the proviso that Ln is at least one of lanthanoids; (e) is a number of 0<e<=5) and (f) wt.% of SiO2 (with the proviso that (f) is a number of 0<f<5) when the weight of the main components is 100 wt.%. |
