ChemInform Abstract: Microstructure Development and Dielectric Properties of Potassium Strontium Niobate Ceramics.

Kimura, Takeshi; Miyamoto, Seiji; Yamaguchi, Takashi

doi:10.1002/chin.199015007

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“…The peak merging phenomenon became apparent in the 'nearly-filled' and 'filled' SCNN ceramics with higher x values. [23][24][25]. As the Na + concentration increased, the grains grew bigger and the anisometric growth behavior became more apparent.…”

Section: Resultsmentioning

confidence: 99%

Electrical and transparent properties induced by structural modulation in (Sr0.925Ca0.075)2.5–0.5Na Nb5O15 ceramics

Yang

Hao

et al. 2017

Journal of the European Ceramic Society

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The effects of Na + concentration on the microstructural, dielectric, ferroelectric and transparent properties of (Sr 0.925 Ca 0.075) 2.5−0.5x Na x Nb 5 O 15 (SCNN; 0.4 ≤ x ≤ 1.0) ceramics prepared using a conventional solid-state reaction method were investigated. X-ray diffraction results showed that the phase structure transitioned from tetragonal to orthorhombic tungsten bronze along with the structural type changing from 'unfilled' to 'filled' state. The NbO 6 octahedron became more distorted and had higher interaction strength when introducing Na + in A-sites to decrease the structural vacancies, leading to the improvement of dielectric and ferroelectric properties. The dielectric spectra of all specimens showed two broad dielectric anomalies: a hightemperature anomaly (the ferroelectric phase transition) and a low-temperature anomaly caused by the subtle structural effects in 'unfilled' SCNN ceramics, which evolved into the ferroelastic phase transition in 'filled' SCNN ceramics.

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Section: Resultsmentioning

confidence: 99%