Synthesis and Characterization of Eu³⁺‐Doped Transparent Glass–ceramics Containing Nanocrystalline Sr^IINb^IVO₃

Abstract

The glass–ceramics containing a rarely achievable nanocrystalline SrIINbIVO3 phase in the 53.75SiO2–18.25K2O–9Bi2O3–9SrO–9Nb2O5–0.5CeO2–0.5Eu2O3 (mol%) glass system were prepared by the melt‐quench technique followed by a two‐stage controlled heat treatment. The unusual oxidation state of Nb in SrIINbIVO3 crystal is 4+ and upon heat treatment of the samples at lower temperature of 500°C for several hours, the glass composition and chemical environment around Nb ions played a key role for the formation of SrIINbIVO3 in the glass–ceramics. The microstructure of the glass–ceramics was studied using TEM and FESEM. The TEM images advocate 10–40 nm crystallite size of SrIINbIVO3. FTIR study confirms that all the samples consist of SiO4, BiO3, BiO6, and NbO6 structural units. The refractive index at different wavelengths was found to vary in the range 1.7105–1.7905 and increase with increase in heat‐treatment time. The luminescence spectra of Eu3+‐doped glass and glass–ceramics were recorded at 465 nm excitation wavelength and the luminescence intensity is found to be increased with heat‐treatment time due to increase in crystallinity. The high intensity ratio of 5D0→7F2 to 5D0→7F1 indicates that the Eu3+‐doped nanocrystalline SrIINbIVO3 glass–ceramics are promising candidate materials as red‐light source.

Structural and optical properties of 30Li2O–55B2O3–5ZnO–xTiO2–(10−x)V2O5, (0≤x≤10) glasses

“…1. Similar findings have been reported for various nanocrystalline glass ceramics [16,17]. It is clearly observed that the nanocrystalline crystals are inhomogeneous and are distributed unevenly in the glass ceramic matrix of TV-0.0.…”

A Simple Method for Estimation of the Scattering Exponent of Nanostructured Glasses

“…Let us consider glass-ceramics GC20 and GC40 prepared and characterized by U. Gangadharini et al in Ref. [ 41 ]. The light scattering in these glass-ceramics was studied in Ref.…”

“…[ 35 ]. The initial glass of the composition 53.75SiO 2 —18.25K 2 O—9Bi 2 O 3 —9SrO—9Nb 2 O 5 —0.5CeO 2 —0.5Eu 2 O 3 (mol%) was heat-treated at 450 °C for 10 h and then at 500 °C for 20 and 40 h to prepare the glass-ceramics GC20 and GC40, respectively [ 41 ].…”

“…The glass-ceramics contain Sr II Nb IV O 3 crystals (JCPDS file card No. 79-0625) with sizes of 20–25 nm [ 41 ] and are characterized by strong light scattering in visible and IR ranges.…”

Microstructure of Eu3+‐Doped Perovskites‐Type Niobate Ceramic La3Mg2NbO9

“…Perovskite‐type materials have been investigated for versatile applications such as pyro‐, piezo‐ and ferroelectric, superconductors, semiconductors, colossal magnetic resistance, lighting and display, photocatalytic, energy save, etc. To enhance electrical, mechanic, and magnetic properties, perovskite‐type materials have been intentionally modified by doping with rare‐earth ions (RE) in the lattices such as La 3+ , Nd 3+ , Y 3+ , Er 3+ , Sm 3+ , and Lu 3+ …”