Dielectric and Pyroelectric Properties of Y-doped Ba0.6Sr0.3Ca0.1TiO3 Ceramics by Solid-state Reaction Technique

doi:10.3724/SP.J.1077.2012.12636

Abstract

Abstract:

(Ba_0.6Sr_0.3Ca_0.1)_1-_xY_xTi_0.999Mn_0.001O₃(0≤x≤0.007) ceramics were prepared by the solid-state reaction technique. The effects of Y doping on the microstructure, dielectric properties and pyroelectric properties were investigated. The average grain size decreases with the increase of Y concentration. The dielectric and pyroelectric properties measurement results show that the dielectric constant, dielectric loss, T_c and pyroelectric coefficient all initially increase and then decrease with Y concentration. And the pyroelectric figure of merit F_d can be improved by the Y doping. The specimen doped with 0.7mol%Y shows a higher maximum F_d value of 8.22×10^-5 Pa^-1/2 under 700 V/mm near 30℃ with the smallest average grain size of 3.1 μm, indicating its promising application in infrared thermal imaging arrays devices.

Key words: (Ba, Sr, Ca)TiO₃, ceramics, dielectric properties, pyroelectric properties

CLC Number:

TQ174

CAO Sheng, MAO Chao-Liang, YAO Chun-Hua, CAO Fei, WANG Gen-Shui, DONG Xian-Lin. Dielectric and Pyroelectric Properties of Y-doped Ba_0.6Sr_0.3Ca_0.1TiO₃ Ceramics by Solid-state Reaction Technique[J]. Journal of Inorganic Materials, 2013, 28(4): 447-452.

Figures/Tables 7

Fig. 1 XRD patterns of BSCYxTM ceramics (0≤x≤0.007)

Fig. 2 Surface SEM images of BSCYxTM ceramics

Fig. 3 Dielectric constant and dielectric loss as a function of temperature at zero bias field for BSCYxTM ceramics (0≤x≤0.007)

Fig. 4 The dielectric constant and dielectric loss as a function of temperature under different DC bias fields for BSCYxTM ceramics (x=0.007)

Fig. 5 Pyroelectric coefficient as a function of temperature under different DC bias fields for BSCYxTM ceramics

Fig. 6 The figures of merit Fd as a function of temperature and DC bias field for BSCYxTM ceramics

Table 1 Pyroelectric properties of BSCYxTM ceramics prepared by solid-state reaction and Sol-Gel method

Material	Bias /(kV·cm^-1)	C_v /(J·cm^-3·K^-1)	p /(×10^-9, C·cm^-2·K^-1)	ε_r	tanδ	F_d/Pa^-1/2	Reference
Ba_0.67Sr_0.33TiO₃	-	2.55	350	5000	0.01	6.52×10^-5	[16]
BSCY_xTM (x=0.005)	7	2.38	269	6287	0.002	9.36×10^-5	This work
BSCY_xTM (x=0.007)	7	2.38	256	6200	0.003	8.22×10^-5	This work
(Ba_0.6Sr_0.3Ca_0.1)TiO₃+ 0.1mol%MnCO₃+0.5mol% Y₂O₃	4	3.2	~270	~8900	~0.01	2.99×10^-5	(Sol-Gel)^[8]
(Ba_0.6Sr_0.3Ca_0.1)TiO₃+ 0.1mol%MnCO₃+0.5mol% Y₂O₃	8	3.2	~300	~6000	~0.005	5.91×10^-5	(Sol-Gel)^[9]

References 16

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Dielectric and Pyroelectric Properties of Y-doped Ba_0.6Sr_0.3Ca_0.1TiO₃ Ceramics by Solid-state Reaction Technique

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