Tungsten bronze Sr1-xBaxNb2O6: A case history of versatility

Neurgaonkar, Ratnakar R.; Hall, William J.; Oliver, J. R.; Ho, W.J.; Cory, W. K.

doi:10.1080/00150198808201379

Cited by 153 publications

(63 citation statements)

References 17 publications

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“…The crystals were grown at Rockwell International Science Center, ͑Thousand Oaks, CA͒ using techniques previously described. 20 All qualitative behavior of the two samples was similar.…”

Section: Experiments and Resultsmentioning

confidence: 62%

Aging and slow dynamics inSrxBa1−xNb2O6

et al. 2005

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The uniaxial "relaxor" ferroelectric Sr x Ba 1−x Nb 2 O 6 ͑SBN͒ is found to crossover from holelike to cumulative aging as it is cooled into the frozen relaxor regime. The cumulative aging contrasts sharply with the behavior of cubic relaxors, supporting ideas that the spin-glasslike aging in cubic relaxors is connected with polarization components orthogonal to the net ferropolarization. In the relaxor regime, small dc fields are found to suppress much of the dissipative response, similar to long-time aging. Pyroelectric currents are measured, along with limits on pyroelectric noise, allowing limits to be set on dynamically coherent domain sizes. Large nonlinear susceptibilities are found near the freezing transition.

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“…The crystals were grown at Rockwell International Science Center, ͑Thousand Oaks, CA͒ using techniques previously described. 20 All qualitative behavior of the two samples was similar.…”

Section: Experiments and Resultsmentioning

confidence: 62%

Aging and slow dynamics inSrxBa1−xNb2O6

et al. 2005

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“…The ferroelectric phase transitions of the SBN family have been discussed within the random-field Ising model [3,4]. SBN shows excellent dielectric [5,6], piezoelectric [7], pyroelectric [8], and photorefractive properties [9][10][11][12].…”

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confidence: 99%

Critical slowing down and elastic anomaly of uniaxial ferroelectricCa0.28Ba0.72Nb2O6crystals with tungsten bronze structure

et al. 2014

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The ferroelectric phase transition of uniaxial Ca 0.28 Ba 0.72 Nb 2 O 6 single crystals with a moderate effective charge disorder was investigated by Brillouin scattering to clarify the dynamic properties. In the tetragonal paraelectric phase a remarkable softening of the sound velocity of the longitudinal acoustic mode and a significant increase in the sound attenuation were observed close to the Curie temperature T C = 527 K. The intermediate temperature T * ∼ 640 K and the Burns temperature T B ∼ 790 K were determined from the temperature variation in the sound attenuation. The intense broad central peak (CP) caused by polarization and strain fluctuations due to polar nanoregions was clearly observed in the vicinity of T C . The relaxation time determined by the CP width clearly shows critical slowing down towards T C , reflecting a weakly first-order phase transition under weak random fields.

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“…The average P sat for single crystals is 27.4 C/cm 2 , and it ranges from 25 to 35 C/ cm 2 depending on the quality of the grown crystal. [31][32][33] While P r improves with f in the c direction, it decreases in the a-b direction. For example, the T5// samples have a P r ‫ס‬ 1 C/cm 2 compared to 0.5 C/cm 2 for the T5-15// samples after sintering at 1400°C for 12 h. In addition, P r (//-cuts) continuously decreases with increasing f due to the consumption of unoriented matrix grains because random samples have higher P r than the //-cut samples due to averaging of properties (Fig.…”

Section: Switching and Piezoelectric Propertiesmentioning

confidence: 99%

“…Pure SBN50 has a T c between 115 and 128°C, depending on the crystal quality. 21,[27][28][29][30][31] This difference can be attributed to the different compositional variations and doping levels in the textured samples.…”

Section: B Dielectric Propertiesmentioning

confidence: 99%

Erratum

2003

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Fiber textured Sr 0.53 Ba 0.47 Nb 2 O 6 ceramics were reactively sintered to ജ95% of the theoretical density from a mixture of SrNb 2 O 6 and BaNb 2 O 6 powders. Texture in 〈001〉 was obtained by templated grain growth on 〈001〉-oriented acicular KSr 2 Nb 5 O 15 template particles. The most highly textured ceramics had a peak dielectric constant of 23,600 (at T c ‫ס‬ 128°C), a remanent polarization (P r ) of 20.3 C/cm 2 , a saturation polarization (P sat ) of 24 C/cm 2 (69-96% of single crystal), and a piezoelectric charge coefficient (d 33 ) of 84 pC/N (76-93% of single crystal). A model, correlating polarization with grain orientation, predicts that P r increases sharply when a percolating grain network forms to transfer charge between elongated grains.

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Tungsten bronze Sr_1-xBa_xNb₂O₆: A case history of versatility

Cited by 153 publications

References 17 publications

Aging and slow dynamics inSrxBa1−xNb2O6

Aging and slow dynamics inSrxBa1−xNb2O6

Critical slowing down and elastic anomaly of uniaxial ferroelectricCa0.28Ba0.72Nb2O6crystals with tungsten bronze structure

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