Highly enhanced sinterability of fine-grained Ba0.6Sr0.4TiO3−MgO bulk ceramics and in-situ nanocomposite thick films

Zhang, Hongfang; Kong, Ling Bing; Mak, Chee Leung; Kwok, Kin Wing; Wang, Yu; Chan, Helen L. W.

doi:10.1016/j.ceramint.2014.03.018

Cited by 3 publications

(1 citation statement)

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“…Recently, remarkable dielectric tunability has been reported in Ba 1−x Sr x TiO 3 -based ceramics, which possess extremely high dielectric constant, low dielectric loss, outstanding dielectric tunability under applied direct current (DC) electric field and well-controlled Curie temperature via adjusting barium/strontium (Ba/Sr) ratio [1][2][3]. Actually, though the dielectric ceramics possess excellent dielectric properties, they also have inconvenience such as lack flexibility and high sintering temperature [4][5][6]. On the other hand, from the practical perspective, low dielectric strength is not conducive to dielectric tunability device applications in high-voltage environment [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Fabrication, characterisation and dielectric properties of KH550 modified BST/PVDF nanocomposites with high dielectric strength

et al. 2016

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Ba 0.6 Sr 0.4 TiO 3 (BST)/poly(vinylidene fluoride) (PVDF) 0-3 nanocomposites with BST nanoparticle contents of 10-40 vol% were prepared by tape casting method. The BST nanoparticles with ∼60 nm crystal size and accurate atomic ratio were synthesised by sol-gel method. The effect of the BST nanoparticle contents on the microstructure and dielectric properties of BST/PVDF nanocomposites were investigated. The BST/PVDF nanocomposites system declares that feasibility of applying low contents nanoparticles to form a homogeneous distribution in polymer matrix, higher dense interface connectivity, thereby providing a significant improvement to the dielectric strength and energy storage density; meanwhile, the nanocomposites possess high dielectric tunability. In this study, the maximum dielectric strength ∼287.12 kV/mm and energy storage density ∼5.15 J/cm 3 were obtained in 10 vol% BST/PVDF nanocomposites, respectively. Moreover, the nanocomposite possesses high dielectric tunability ∼62.6% at 58 kV/mm, which proposed the nanocomposites suitable for tunable microwave devices, supercapacitors and energy storage device applications at high-voltage environment. 2 Experimental procedure 2.1 Materials The following materials are used to prepare the BST/PVDF nanocomposites. Acetic acid glacial (C 3 COOH, AR, ≥99.5%) and ethanol (C 2 H 6 O, AR, ≥99.7%) were purchased from Tianjin Fuyu Fine Chemical Co., Ltd. Sr acetate [Sr(C 2 H 3 O 2) 2 , AR, ≥99.0%], Ba acetate [(Ba(C 2 H 3 O 2) 2 , AR, ≥99.0%] and tetrabutyl titanate (Ti [OCH(CH 3) 2 ] 4 , chemically pure reagent (CP), ≥98.0%) were supplied by Sinopharm Chemical Reagent Co., Ltd. N, N-dimethyl formamide (DMF) (AR, ≥99.5%) was provided by Guangdong Guanghua Sci-Tech Co., Ltd. PVDF polymer was obtained from Shanghai 3F New Materials Co., Ltd. 2.2 Preparation of KH550 modified BST nano-powders The BST nano-powder were prepared by sol-gel method. Stoichiometric amount of Ba(C 2 H 3 O 2) 2 , Sr(C 2 H 3 O 2) 2 and Ti[OCH High Voltage

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