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The Na/Sm co-doped CaBi 2 Nb 2 O 9 textured ceramics with a high texture degree of 95–98% were successfully prepared by improved grain growth method, achieving the highest piezoelectric coefficient ( d 33 > 30 pC N −1 ) in the CaBi 2 Nb 2 O 9 systems.
Luo et al. (Wed,) studied this question.