Crystal-Oriented La-Substituted Sr2NaNb5O15 Ceramics Fabricated Using High-Magnetic-Field Method

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To prevent cracking in and improve the piezoelectric properties of what, we fabricated crystal-oriented Sr2-xNa1-xLaxNb5O15 (SNLN) ceramics using the high-magnetic-field method. With increasing amount of La substituted in SNLNs, the bonding strength along the $c$-axis increased and the crystal anisotropy of coefficient of linear expansion decreased, and as a result cracks were prevented. $a$–$b$-plane-oriented SNLNs with Lotgering factors of 0.5 to 0.6 were fabricated. These oriented SNLNs with restrained cracks had lower La contents $x\geq 0.05$ than randomly oriented SNLNs. The piezoelectric constant of the oriented SNLNs with $x=0.05$ had $d_{33}=95$ pC/N, which increased up to 1.5-fold that of randomly oriented SNLNs. It was apparent that the crystal-oriented SNLN ceramics could show restrained cracks and enhanced piezoelectric properties.
2006-09-30