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Study on A-site Cation Doping of CaBi2Nb2O9 with Bismuth Layered Structure

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Author(s): ZONG Li-Chao, ZENG Jiang-Tao, ZHAO Su-Chuan, RUAN Wei,LI Guo-Rong

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 7;
Start page: 726;
Date: 2012;
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Keywords: piezoelectric ceramics; modified; d33; CaBi2Nb2O9

ABSTRACT
High curie temperature piezoelectric ceramics based on KLa-dopedCa1-x(KLa)x/2Bi2Nb2O9(x=0–0.20) were prepared by a conventional solid state reaction method. Crystal structure and microstructures of Ca1-x(KLa)x/2Bi2Nb2O9 ceramics were characterized by XRD and SEM. XRD patterns show that the crystal structures are a single phase of bismuth oxide layer structure having general formula (Bi2O2)2+(Am-1BmO3m+1)2- with m = 2. The grains of polished and thermally etched surfaces revealled a plate-liked morphology. The Curie point (Tc) decreases obviously whereas the piezoelectric activity of CBNO ceramics is significantly improved by the doping of potassium and lanthanum. The KLa-doped CBNO materials have an electrical conductivity value 1–2 orders of magnitude lower than undoped samples. The thermal depoling behavior ofCa1-x(KLa)x/2Bi2Nb2O9 ceramics shows that all of them have a high Curie point (Tc≥850¡䧠and show good resistance to thermal depoling up to temperatures close to their Curie points. The results showed that the excellent properties is obtained in the ceramics with composition of x=0.1, i.e. d33=15.8 pC/N, Tc=870¡䟡nd the DC conductivity is one order of magnitude smaller than that of undoped CBNO. All the results suggest that the doped CaBi2Nb2O9 is a potential material for high temperature sensor.
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