Synthesis and characterization of rare-earth doped SrBi2Nb2O9 phase in lithium borate based nanocrystallized glasses

Venkataraman, B.; Fujiwara, Takeshi; Komatsu, Takayuki

doi:10.1016/j.jssc.2009.04.004

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…It should also be pointed out that various optically transparent crystallized glasses containing Nb 2 O 5 -based nanocrystals have been reported so far [2,[43][44][45][46][47][48][49]. These previous studies strongly suggest that NbO n polyhedra would not be present as a network former, but rather exist as a modifier in the space created in the inside of network rings.…”

Section: Discussionmentioning

confidence: 92%

Effect of Al2O3 addition on the formation of perovskite-type NaNbO3 nanocrystals in silicate-based glasses

Kioka¹,

Honma²,

Oh-ishi³

et al. 2012

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 92%

Effect of Al2O3 addition on the formation of perovskite-type NaNbO3 nanocrystals in silicate-based glasses

Kioka¹,

Honma²,

Oh-ishi³

et al. 2012

Journal of Non-Crystalline Solids

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“…Bismuth niobate layered crystals such as SrBi 2 Nb 2 O 9 , that is, the Aurivillius family of ferroelectric oxides, have received much attention because of their piezoelectric, pyroelectric, and catalytic properties. The formation of the fluorite‐like (Sr,Ba)Bi 2 Nb 2 O 9 nanocrystals has been reported in the crystallization of x (SrO/BaO–Bi 2 O 3 –Nb 2 O 5 )–(100 – x )Li 2 B 4 O 7 glasses ( x = 10–60) (mol%), in which layered perovskite‐type (Sr,Ba)Bi 2 Nb 2 O 9 nanocrystals with an orthorhombic structure are induced through the intermediate fluorite‐like nanocrystals 166–169 . Bi 3 TiNbO 9 ferroelectrics are synthesized through the crystallization of 40Bi 2 O 3 –(10–15)TiO 2 –(10–15)Nb 2 O 5 –(33.4–40)B 2 O 3 glasses 170 .…”

Section: Nanocrystallizationmentioning

confidence: 97%

A new perspective for nucleation and nanocrystallization from interfacial energy and nanoscale composition fluctuations in glasses

Komatsu,

Honma

2023

Int J of Appl Glass Sci

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Nucleation behaviors in glasses/supercooled liquids (SCLs) such as lithium disilicate Li2O–2SiO2, cordierite Mg2Al4Si5O18, fresnoite Ba2TiSi2O8, and K2O–Nb2O5–GeO2/TeO2 glasses were analyzed and discussed from the interfacial energy γ at SCL–nucleus interfaces and nanoscale composition fluctuations. Based on the fragility concept for SCLs and the intrinsic origin of γ, the magnitude order of γ(fragile SCL) < γ(strong SCL) was proposed to be a crucial guide for an understanding of high homogeneous nucleation rates and prominent nanocrystallization. The role of nucleating agent TiO2/ZrO2 in accelerating the nucleation rate in cordierite‐based and β‐spodumene‐type Li2O–Al2O3–SiO2‐based glasses was discussed from the new perspective of γ(homoepitaxial‐like nucleation) < γ(heteroepitaxial‐like nucleation). Ferroelectric nanocrystals such as SrxBa1–xNb2O6 in borate glasses and fluoride nanocrystals such as CaF2 are also well understood from the proposed guidelines. The present article provides a new perspective for nucleation in glasses/SCLs, contributing to the comprehensive composition design of new innovative glass‐ceramics.

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Multiple relaxation mechanisms in SrBi2Nb2O9 ceramic tweaked by tin and samarium incorporation in assistance with single-step microwave sintering

Pritam,

Bhattacharya,

Sain

et al. 2024

Appl. Phys. A

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Non-stoichiometric lead free polycrystalline Sr0.8Sn0.2Bi1.75Sm0.25Nb2O9 (SSBSN) ferroelectric ceramics were synthesized through conventional solid step route method by incorporating ball milling and microwave sintering method. X-ray diffraction along with the Rietveld refinement technique confirms the single-phase orthorhombic structure with A21 crystal symmetry. Additionally, the short-range ordering was confirmed by Raman spectroscopy. Doping induced crystallite size and strain were further calculated from the Williamson-Hall plot, which comes around 150 nm and 1.48 × 10–3 respectively. A plate like morphology with an average grain size of 0.41 μm was confirmed by scanning electron microscopy (SEM). A diffuse type ferroelectric to paraelectric phase transition was recorded at 395 °C, mostly arising due to structural heterogeneity at the inter-ferroelectric phase boundary. The temperature and frequency-dependent dielectric measurement of SSBSN ceramic reveal a Maxwell–Wagner relaxation, with prominent dielectric loss in a low frequency regime perhaps due to the generation of leakage current in the SSBSN system. Frequency dependent ac conductivity indicates the polaron assisted hopping mechanism in SSBSN, which further obeys Jonscher’s formulation. The intra and intergranular contributions to impedance in SSBSN ceramics were probed by the complex impedance spectroscopy (CIS) technique. A non-Debye type relaxation mechanism in SSBSN ceramics was indicated by the Cole–Cole plot, whereas the conduction mechanism and transport properties were briefly studied using modulus spectroscopy.

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Synthesis and characterization of rare-earth doped SrBi2Nb2O9 phase in lithium borate based nanocrystallized glasses

Cited by 9 publications

References 28 publications

Effect of Al2O3 addition on the formation of perovskite-type NaNbO3 nanocrystals in silicate-based glasses

Effect of Al2O3 addition on the formation of perovskite-type NaNbO3 nanocrystals in silicate-based glasses

A new perspective for nucleation and nanocrystallization from interfacial energy and nanoscale composition fluctuations in glasses

Multiple relaxation mechanisms in SrBi2Nb2O9 ceramic tweaked by tin and samarium incorporation in assistance with single-step microwave sintering

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