The perovskite‐like layer‐structured (PLS) Nd 2 Ti 2 O 7 and La 2 Ti 2 O 7 have possibly the highest Curie points of any materials. To pole these ceramics, highly textured, dense ceramics with high DC electrical resistivity are required. The ferroelectric and piezoelectric properties of lead‐free Nd 2 Ti 2 O 7 and La 2 Ti 2 O 7 grain‐oriented ceramics prepared by spark plasma sintering using a two‐step method are reported. The T c of Nd 2 Ti 2 O 7 and La 2 Ti 2 O 7 are 1482±5° and 1461±5°C, respectively. The measured piezoelectric constant of the textured La 2 Ti 2 O 7 was d 33 =2.6 pC/N. These results now open up the possibility of studying the ferroelectric/piezoelectric properties of the PLS family of ceramics with super‐high Curie points.
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Yan et al. (2009) studied this question.
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