Giant dielectric response with metastable phase crystallization from Ba1-Ca Ti2O5 glasses

Masuno, Atsunobu; Inoue, Hiroyuki; Arai, Yasutomo; Yu, Jiahui; Moriyoshi, Chikako; Kuroiwa, Yoshihiro; Watanabe, Yasuhiro

doi:10.1016/j.jnoncrysol.2012.05.017

Cited by 11 publications

(4 citation statements)

References 19 publications

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“…The melt was levitated by oxygen gas. The details of the ADL technique are described in previous reports13141516. For all compositions, glass formation was confirmed by X-ray diffraction measurements with Cu K α radiation.…”

Section: Methodsmentioning

confidence: 85%

“…Depending on the glass composition, the diameter of the spherically shaped solidified glasses was approximately 1.2–3.5 mm. With increasing Ca content, glass stability was enhanced, and larger-sized glass samples were obtained1516.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, we reported that Ba 1− x Ca x Ti 2 O 5 glasses could be obtained by containerless processing13141516. The glass-forming region is wide and allows x values as high as 0.85.…”

mentioning

confidence: 99%

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Stabilization of metastable ferroelectric Ba1−xCaxTi2O5 by breaking Ca-site selectivity via crystallization from glass

Masuno

Moriyoshi

Mizoguchi

et al. 2013

Sci Rep

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The thermal stability and dielectric and structural properties of ferroelectric Ba1−xCaxTi2O5 (0 ≤ x ≤ 0.30) prepared by crystallization from glass are investigated. The Ba1−xCaxTi2O5 compounds with x < 0.10 are thermally stable phases, while those with x ≥ 0.10 are metastable phases. The ferroelectric transition temperature drastically decreases from 470 to 220°C with increasing x. Crystal structure analyses reveal that one of two possible Ba sites is occupied by Ca in the stable phase region, while Ca-site selectivity is broken in the metastable phase region. The Ca-site selectivity introduces local distortion and makes the crystal lattice unstable. However, the local distortion is suppressed by the occupancy of Ca into both Ba sites. Accordingly, the metastable ferroelectric phase can be obtained beyond the substitution limit of Ca by crystallization from the glassy state. The stabilization mechanism provides possible wide control of the functionality of materials by expanding the composition range.

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Section: Methodsmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Stabilization of metastable ferroelectric Ba1−xCaxTi2O5 by breaking Ca-site selectivity via crystallization from glass

Masuno

Moriyoshi

Mizoguchi

et al. 2013

Sci Rep

Self Cite

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“…Titanium oxide glasses free of conventional glass‐forming cations, such as Si, B, P, or Te, are able to be vitrified by roller quenching or through containerless processes where the melt‐crucible interface is absent 1–4 . Typically formed with alkaline‐earth or rare‐earth cations as the ‘modifier’,

{\rm TiO}_2

based glasses are of interest for electrical 5 and optical 6–8 applications. Titanate glasses defy Zachariasen's rules with their high coordination numbers and significant edge sharing 9–11 .…”

Section: Introductionmentioning

confidence: 99%

Site‐selective fluorescence and spectroscopic properties of Yb‐doped lanthanum titanate glasses

Topper,

Neumann,

Wilke

et al. 2024

Int J of Appl Glass Sci

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Ytterbium‐doped lanthanum titanate glasses were prepared by levitation melting for the detailed characterization of the spectroscopic properties in the rare‐earth titanate glass host. Low‐temperature fluorescence spectroscopy reveals distinct site‐selectivity in both static and lifetime fluorescence measurements suggesting an absence of clustering as well as significant variation of local ytterbium environments. Typical site‐selectivity behavior of a shrinking Stark manifold with lower excitation energy is observed. At 77 K, both the mean emission frequency and the fluorescence lifetime initially increase as the excitation energy decreases from about 11100 to 10750 and then slightly decrease at lower excitation energy. Temperature‐dependent lifetime measurements between 77 and 420 K show a decreasing lifetime with increasing temperature and are well described by a two‐level thermal activation model. The temperature‐dependent fluorescence spectroscopy coupled with a room temperature white light absorption measurement allow the determination of the Stark energy levels of in lanthanum titanate glass as well as the calculation of the laser cross‐sections.

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Optimization of the dielectric properties and energy storage density in (K2O, SrO)–Nb2O5–B2O3–Al2O3–SiO2 glass–ceramics

et al. 2016

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Giant dielectric response with metastable phase crystallization from Ba1-Ca Ti2O5 glasses

Cited by 11 publications

References 19 publications

Stabilization of metastable ferroelectric Ba1−xCaxTi2O5 by breaking Ca-site selectivity via crystallization from glass

Stabilization of metastable ferroelectric Ba1−xCaxTi2O5 by breaking Ca-site selectivity via crystallization from glass

Site‐selective fluorescence and spectroscopic properties of Yb‐doped lanthanum titanate glasses

Optimization of the dielectric properties and energy storage density in (K2O, SrO)–Nb2O5–B2O3–Al2O3–SiO2 glass–ceramics

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