Ferroelectric solid solutions (Ba,Sr)TiO3 for microwave applications

“…Among the perovskites mixed systems, Ba 1-x Sr x TiO 3 (BST) is an interesting series due to its unique ferroelectric properties which are suitable for various potential applications [8]. And that the BST system shows high permittivity which has a wide interest in the field of electrically controlled devices [9].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Dielectric Properties of BST/BF Multiferroic Ceramic Materials

Zhang¹,

Qiu²,

Pan³

et al. 2016

JMSE-A

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Abstract:The lead-free multiferroic ceramic of (1-x)Ba 0.70 Sr 0.30 TiO 3 (BST) + xBiFeO 3 (BFO) was synthesized by a conventional solid-state reaction method. The dielectric, ferroelectric and magnetic properties was studied. The X-ray diffractomentry (XRD) revealed that the ceramic formed a single perovskite structure. The results suggested that the remanent magnetization (Mr) reached to maximum when the BFO content is up to 0.05. The powder of the samples Mr = 70 memu/g when x = 0.05. The change of the electrical resistance with magnetic field of the (1-x)Ba 0.70 Sr 0.30 TiO 3 + xBiFeO 3 samples reached 25.6% when x = 0.03. The relative dielectric constant was reduced under magnetic field compared with no magnetic field and the change is 13.1% as x = 0.01. It is indicated that the lead-free multiferroic ceramic of (1-x)Ba 0.70 Sr 0.30 TiO 3 + xBiFeO 3 exhibited both ferroelectric and magnetic at room temperature. The ferroelectric and magnetic properties are derived from the displacement of magnetic atom iron and the change of the atomic spin state.

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“…Using niobium oxide in few percent, in the system Ba(Ti,Nb)O 3 , caused a severe decrease in Curie temperature and raised the tetragonal-orthorhombic and orthorhombic-rhombic transition points. To control porosity, MgO and MnO 2 dopants (1 wt.% each) were added to Ba (1-x) Sr (x) TiO 3 ceramics (x=0.25, 0.50, 0.75, 0.90) sintered at 1260°C [27].…”

Section: Introductionmentioning

confidence: 99%

Structural and mechanical properties characterization of barium strontium titanate (BST) ceramics

et al. 2011

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Ba (1-x) Sr (x) TiO 3 ceramics, where x=0.05, 0.10, 0.15, and 0.20, were prepared by solid state reaction technique. X-ray diffraction analysis confirmed the formation of single phase perovskite structures. Mechanical properties such as ultrasonic attenuation, longitudinal wave velocity, and longitudinal elastic modulus were studied by an ultrasonic pulse echo technique at 2 MHz. Investigations of ceramic microstructures and mechanical properties showed its dependence on composition and sintering time. Increasing of Sr content, x, resulted in a decrease in bulk density and ultrasonic attenuation and an increase in velocity and modulus. Also, size of crystallites and c/a ratio were found to decrease with increasing of x, and increased with increasing of sintering time. High temperature ultrasonic studies showed, in addition to Curie phase transition, two relaxation peaks and its origin was investigated. The acquired structural and mechanical results were correlated and discussed.

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Ferroelectric solid solutions (Ba,Sr)TiO3 for microwave applications

Cited by 32 publications

References 4 publications

BST solid solutions, temperature evolution of the ferroelectric transitions

BST solid solutions, temperature evolution of the ferroelectric transitions

Magnetic and Dielectric Properties of BST/BF Multiferroic Ceramic Materials

Structural and mechanical properties characterization of barium strontium titanate (BST) ceramics

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