The transparent willemite, Zn2SiO4 (ZS) glass-ceramic nanocomposites were prepared from melt-quench derived ZnO-Al2O 3-B2O3-SiO2 (ZABS) precursor glass by an isothermal heat-treatment process. The generation of willemite crystal phase, size and morphology with increase in heat-treatment time was examined by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) techniques. The average calculated crystallite size obtained from XRD is found to be in the range 80-120 nm. The decreased refractive index with increase in heat-treatment time attributed to partial replacement of ZnO4 units of willemite nanocrystals by AlO4 units and simultaneous generation of vacancies in the Zn-site. Fourier transform infrared (FTIR) reflection spectroscopy exhibits the structural evolution of willemite glass-ceramics. The photoluminescence spectra of Sm3+ ions exhibit emission transitions of 4G5/2 → 6HJ (J = 5/2, 7/2, 9/2, 11/2) and its excitation spectra shows an intense absorption band at 402 nm. These spectra reveal that the luminescence performance of the glass-ceramic nanocomposites is enhanced up to 14-fold with crystallization into willemite. © 2014 Elsevier B.V. All rights reserved.

SUNANDA MUKHOPADHYAY

Chemical Technology

A TARAFDER

A R MOLLA

B KARMAKAR

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Optical Materials

The Eu 3+-doped novel precursor glass in the K 2O-SiO 2-SrO-Bi 2O 3-Ta 2O 5 system was prepared using the melt-quench technique. The transparent SrBi 2Ta 2O 9 (SBT) glass-ceramic nanocomposites were derived from this glass using a controlled crystallization process. The formation of SBT crystal phase, size, and morphology with increase in heat-treatment time was examined using X-ray diffraction, field emission scanning electron microscopy, and fourier transform infrared transmission spectroscopy. Vicker's hardness study indicates marked improvement of hardness in the glass-ceramics compared to precursor glass. The photoluminescence spectra of Eu 3+ ions exhibit emission transitions of 5D 0→ 7F j (j = 0, 1, 2, 3, and 4) and its excitation spectra show an intense absorption band at 467 nm. These spectra reveal that the Eu 3+ ions are gradually entering into the SBT nanocrystals present in the glass-ceramics. This study indicates that the incorporation of Eu 3+ ions into SBT crystal lattice enhances the photoluminescence performance of the glass-ceramics by two-fold. It is believed that this work would generate significant impact in the exploration of SBT glass-ceramic nanocomposites. © 2012 The American Ceramic Society.

Journal of the American Ceramic Society

Synthesis and properties of SrBi 2 Ta 2 O 9-based glass-ceramics modified with Eu 3+

Thermal, Structural, and Enhanced Photoluminescence Properties of Eu3+-doped Transparent Willemite Glass-Ceramic Nanocomposites

Enhanced photoluminescence and structure of Dy3+-doped SrBi2Ta2O9-containing transparent glass-ceramics

Journal of the Optical Society of America B

Laser cooling with Tm^3+-doped oxy-fluoride glass ceramic

Applied Physics A

Structural, spectroscopic and crystal field analyses of Ni2+ and Co2+ doped Zn2SiO4 powders

Fabrication and enhanced photoluminescence properties of Sm 3+-doped ZnO-Al2O3-B2O 3-SiO2 glass derived willemite glass-ceramic nanocomposites

Journal	Data powered by TypesetOptical Materials
Publisher	Data powered by TypesetElsevier B.V.
ISSN	0925-3467
Open Access	No