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Cheng, Buwen; Su, Bo; Holmes, J.E.R.; Button, T.W.; Gabbay, M.; Fantozzi, Gilbert

doi:10.1023/a:1021633917071

Cited by 40 publications

(20 citation statements)

References 23 publications

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“…5, where the intensities of the diffraction peaks are decreased which is in good agreement with the reported result [34]. Microstructures of Ba x Sr 1-x TiO 3 ceramics, with x=1, 0.7, 0.6, and 0.5, were described [37], and the reported results showed an abnormal grain growth obtained with coarse grains of about 50 μm, surrounded by fine grains of about 2 μm. Also, the grain size was increased with increasing of Ba content or, in other words, substitution of Ba by Sr inhibited growth of grains.…”

Section: Attenuation Elastic Modulus and Ultrasonic Velocitysupporting

confidence: 89%

“…Whereas, relaxation peaks with energies larger than 1.1 eV were interpreted to diffusion of point defects in ferroelectric phase of these ceramics. Although, comparison between mechanical measurements [21,29] and other dielectric ones [37,39] on BST materials makes it possible to show that these measurements are fully connected; there are some notations which could be summarized in the following manner: i) Dielectric measurements [39] of the real part of permittivity confirmed that the Curie temperature, of investigated BST materials, was frequency-independent in the range 0.1-200 kHz, see Fig. 8 of Ref.…”

Section: Temperature Dependence Of Ultrasonic Attenuationmentioning

confidence: 91%

“…Also, the grain size was increased with increasing of Ba content or, in other words, substitution of Ba by Sr inhibited growth of grains. Therefore, the ceramic microstructure, by this way, has its effect on ultrasonic velocity, elastic modulus, and attenuation of ultrasonic waves as follows: increasing of Sr content would increase porosity [32], and decreases the particle sizes [34,37] in the formed perovskite polycrystalline structures. This in turn decreases the attenuation of ultrasonic waves propagated in these ceramics, increases elastic modulus, and ultrasonic velocity [36], as obtained in Fig.…”

Section: Attenuation Elastic Modulus and Ultrasonic Velocitymentioning

confidence: 99%

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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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Section: Attenuation Elastic Modulus and Ultrasonic Velocitysupporting

confidence: 89%

Section: Temperature Dependence Of Ultrasonic Attenuationmentioning

confidence: 91%

Section: Attenuation Elastic Modulus and Ultrasonic Velocitymentioning

confidence: 99%

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

et al. 2011

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“…Additionally, the large stress in nanograin BT ceramics [18] may also play a role in producing high strength. It is believed that one relaxation process exists in all the ferroelectric phase, which demonstrates a memory effect of ferroelectric domain configuration [19], in the mean time local compressional and tensile stresses will take place. …”

Section: Methodsmentioning

confidence: 99%

Grain-size effects on the hardness of nanograin BaTiO3 ceramics

et al. 2007

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Dense nanocrystalline BaTiO 3 (BT) ceramics with grain size (GS) 50 nm were successfully prepared by spark plasma sintering (SPS) method. The nanoindentation experiment was used to test the hardness of different GS BT ceramics. It was found that the hardness of 50 nm nanograin BT ceramics increased 82% than that of 1.2 μm BT ceramics fabricated by conventional sintering (CS) process. Dislocation pinning resulting from the increase of grain boundary by ultrafine GS are believed to be the dominant factor in raising strength. Restriction on dislocation generation and mobility due to the domain wall motion and sliding imposed by ultrafine GS are expected to be exceptionally important. At the same time, the large stress in nanograin BT ceramics may also play a role in producing high strength. These differences of the hardness behavior between BT ceramics are attributed to the variation of the resultant microstructure, especially the GS of the ceramics.

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“…In order to develop a material system with both high piezoelectric performance and high T d , to investigate the mechanisms that leads to a variation of T d according to the crystal structure are still important objects. Ferroelectric (Ba 1−a Sr a )TiO 3 (BST) material is widely used in microelectronic device due to its high dielectric properties and is a good doping compound to improve the dielectric properties of pure BNT [25]. According to the tolerance factor calculation as mentioned above [18], the MPB composition of (1 − x)(Bi 0.5 Na 0.5 )TiO 3 -x(Ba 1−a Sr a )TiO 3 system is corresponding to a tolerance factor of around 0.991 in which the x value shifts from 0.06 to 0.08 as the Sr 2+ content increases from a = 0-0.3.…”

Section: Introductionmentioning

confidence: 99%