6TAKENNDA T, SAKATA K, TODA K. Dielectric,piezoelectric and pyroclectric properties ot (BiNa)1/2 TiO3-based ceramics[J]. Ferroelectrics, 1989,95(2) :153-156.
7TAKENNDA T, SAKATA K, TODA K. Lead-free piezoelectric ceramics based on (Na1/2 Bi1/2 ) TiO3-NaNbO3[J]. Ferroelectrics, 1997, 196(2): 175-178.