Structural and Depolarization Temperature of 0.94Na1/2Bi1/2TiO3-0.06BaTiO3:TiO2 Lead Free Composite Ceramics

doi:10.15541/jim20180568

Abstract

Abstract:

0.94Na_1/2Bi_1/2TiO₃-0.06BaTiO₃ (NBT-6BT) perovskite structure ceramics doped by nano-sized TiO₂, which stayed in the grain boundaries of NBT-6BT grains, were prepared by the solid-state method. NBT-6BT: xTiO₂ (x=0, 0.05, 0.1, 0.2, 0.3) 0-3 type composite structure ceramics were fabricated successfully and the effects of doped TiO₂ on structure and piezoelectric properties were investigated in detail. The results show that some TiO₂ enter into the lattice of NBT-6BT matrix, which result in a decrease of Cc phase content and an enhancement of crystal symmetry. The increasing amounts of TiO₂ significantly improve the depolarization temperature of NBT-6BT ceramics. After doping 0.1 mol of TiO₂, the depolarization temperature improves by 88%. The dielectric loss tanδ and piezoelectric coefficient d₃₃ are 0.044 and 99 pC/N, respectively, which indicates that this kind of ceramic is a new type of lead-free piezoelectric materials suitable for higher temperature range.

Key words: piezoceramic materials, NBT-6BT, composite structure, depolarization

CLC Number:

TQ174

SU Chun-Yang, JIANG Xiang-Ping, Chen Chao, Hu Hao, Liu fang, ZHENG Lai-Qi. Structural and Depolarization Temperature of 0.94Na_1/2Bi_1/2TiO₃-0.06BaTiO₃:TiO₂ Lead Free Composite Ceramics[J]. Journal of Inorganic Materials, 2019, 34(10): 1085-1090.

Figures/Tables 8

Fig. 1 Room temperature unpoled XRD patterns of NBT-6BT: xTiO2 composite ceramics (a) 2θ=10°-80°; (b) 2θ=36°-50°

Fig. 2 SEM (a) and EDS (b-e) images of NBT-6BT: xTiO2 composite ceramic

Fig. 3 Raman spectra of NBT-6BT: xTiO2 composite ceramics at room temperature

Fig. 4 Raman mode frequencies as a function of compositions for NBT-6BT: xTiO2 composite ceramics

Fig. 5 Rietveld structural refinement plots of NBT-6BT: xTiO2 composite ceramics at room temperature (a) x=0.0; (b) x=0.2

Table 1 Phase fraction and lattice parameters of structural refinement plots of NBT-6BT: xTiO2 samples originating from Rietveld structural refinement

Sample/mole	Phase fraction/wt%		Lattice parameters			V/nm³
Sample/mole	Phase fraction/wt%		a/nm	b/nm	c/nm	V/nm³
x=0.0	R3c	20.84	0.5564	0.5564	1.3674	0.366654
x=0.0	Cc	79.16	0.9559	0.5533	0.5530	0.238807
x=0.05	R3c	32.64	0.5542	0.5542	1.3648	0.363140
x=0.05	Cc	67.36	0.9524	0.5504	0.5537	0.237428
x=0.1	R3c	33.77	0.5517	0.5517	1.3616	0.358981
x=0.1	Cc	66.23	0.9508	0.5492	0.5533	0.236407
x=0.2	R3c	42.84	0.5531	0.5531	1.3636	0.361341
x=0.2	Cc	57.16	0.9517	0.5490	0.5531	0.236311
x=0.3	R3c	58.92	0.5503	0.5503	1.3443	0.352637
x=0.3	Cc	41.08	0.9589	0.5488	0.5556	0.237663

Fig. 6 Temperature dependence (a-d) of the dielectric constant εr and dielectric loss tanδ of poled NBT-6BT: xTiO2 composite ceramics with x=0, 0.1, 0.2 and 0.3, and Composition dependence (e) of Td and dielectric loss tanδ

Fig. 7 Piezoelectric coefficient (d33) of NBT-6BT: xTiO2 composite ceramics at room temperature (a) and temperature dependence of d33 of composite ceramics (b)

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Structural and Depolarization Temperature of 0.94Na_1/2Bi_1/2TiO₃-0.06BaTiO₃:TiO₂ Lead Free Composite Ceramics

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