| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition free from lead, intended for improving the piezoelectric properties of (Ba1-x Srx )2 NaNb5 O15 (0<=(x)<=1) ceramics, and practicable as a material for piezoelectric ceramic devices such as piezoelectric ceramic filters. SOLUTION: This piezoelectric ceramic composition consists mainly of a ceramic component shown by the formula: (1-y)(Ba1-x Srx )Nb2 O6 -yNaNbO3 (0<=(x)<=1; 0.15<=(y)<1/3) and also pref. contains, as subcomponent(s), a total of <=5 wt.% of at least one kind selected from respective oxides of Mn, Cr, W, Si, Mo, Ni, Co, Sn, Mg, Sb, Ti, Zr and Fe, in terms of MnO2 , Cr2 O3 , WO3 , SiO2 , MoO3 , NiO, Co2 O3 , SnO2 , MgO, Sb2 O3 , TiO2 , ZrO2 and Fe2 O3 , respectively. |
