Effect of grain size on dielectric and ferroelectric properties of nanostructured Ba0.8Sr0.2TiO3 ceramics

doi:10.1007/s40145-015-0130-8

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Abstract

Barium strontium titanate (Ba_0.8Sr_0.2TiO₃, BST) nanocrystalline ceramics have been synthesized by high energy ball milling. As the sintering temperature increases from 1200 ℃ to 1350 ℃, the average grain size of BST ceramics increases from 86 nm to 123 nm. The X-ray diffraction (XRD) studies show that these ceramics are tetragonal. The phase and grain size of the sintered pellets have been estimated from the XRD patterns, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. The effect of grain size on dielectric and ferroelectric properties is studied. The dielectric and piezoelectric parameters are greatly improved at room temperature with increase in grain size. The Curie transition temperature is found to shift slightly towards higher temperatures as the grain increases from 86 nm to 123 nm. The coercive field decreases and the remnant polarization and spontaneous polarization increase as the grain size of BST nano ceramics increases. These ceramics are promising materials for tunable capacitor device applications.

Key words： nanocrystalline ceramics lead free ceramics crystallization electron microscopy dielectric properties hysteresis

Received: 10 August 2014 Published: 04 June 2015

Corresponding Authors: Venkata Ramana MUDINEPALLI

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	Venkata Ramana MUDINEPALLI
	Leng FENG
	Wen-Chin LIN
	B. S. MURTY

Cite this article:

Venkata Ramana MUDINEPALLI,Leng FENG,Wen-Chin LIN, et al. Effect of grain size on dielectric and ferroelectric properties of nanostructured Ba_0.8Sr_0.2TiO₃ ceramics[J]. Journal of Advanced Ceramics, 2015, 4(1): 46-53.

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http://jac.tsinghuajournals.com/EN/10.1007/s40145-015-0130-8 OR http://jac.tsinghuajournals.com/EN/Y2015/V4/I1/46

Lattice parameters of BST nanocrystalline ferroelectric ceramics

(a) XRD patterns of mechanically activated BST ceramics at different ball milling time; (b) XRD of BST composition at different temperatures; (c) XRD profile around 45° to 47°; (d) lattice constants of the samples dependent on the mean grain size.

SEM of BST ceramics ball milled for 20 h and sintered at (a) 1200 ℃, (b) 1250 ℃, (c) 1300 ℃ and (d) 1350 ℃ for 2 h.

TEM of BST ceramics ball milled for 20 h and sintered at 1350 ℃ for 2 h.

Variations in grain size, density, dielectric constant at T_R and T_C and piezoelectric coefficient d₃₃ with different sintering temperatures

(a) Relative density and (b) grain size as a function of sintering temperature.

(a) Temperature dependence of the dielectric constant at 100 kHz with different grain sizes; (b) grain size dependence of the dielectric constant at T_R and T_C.

Grain size dependence of the piezoelectric constant d₃₃ of BST ceramics.

Values of E_c, P_max and P_r obtained from the hysteresis loops of BST ceramics with different grain sizes

(a) Ferroelectric hysteresis loops at room temperature and 1 kHz with different grain sizes; (b) grain size dependence of the remanent polarization (P_r) and the coercive field (E_c) of BST ceramics.

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