The perovskite‐like layer structured strontium niobate (Sr 2 Nb 2 O 7 ) and calcium niobate (Ca 2 Nb 2 O 7 ) are good candidates for high‐temperature piezoelectric applications because of their high Curie points. Single‐phase dense Sr 2 Nb 2 O 7 and Ca 2 Nb 2 O 7 ceramics with grain‐oriented microstructures were prepared by spark plasma sintering using a two‐step method. The Lotgering orientation factors were 0.86 and 0.70 for Sr 2 Nb 2 O 7 and Ca 2 Nb 2 O 7 , respectively. The T c of Sr 2 Nb 2 O 7 and Ca 2 Nb 2 O 7 were measured as 1327±5°C and above 1525°C, respectively. The dielectric, piezoelectric, ferroelectric properties, and direct‐current electrical conductivity are higher along the directions perpendicular to the pressing direction compared with parallel. The piezoelectric constant d 33 for Sr 2 Nb 2 O 7 was 2.8±0.2 pC/N.
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Ning et al. (2010) studied this question.
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