Issue 24, 2020

Formation kinetics of Sr0.25Ba0.75Nb2O6 and Li2B4O7 crystals from 0.25SrO–0.75BaO–Nb2O5–Li2O–2B2O3 glass

Abstract

We have investigated the transition kinetics of Sr0.25Ba0.75Nb2O6 (SBN) and Li2B4O7 (LBO) crystals from 0.25SrO–0.75BaO–Nb2O5–Li2O–2B2O3 (SBNLBO) glass under isothermal and non-isothermal processes. With increasing temperature, there are two consecutive steps of crystallization of SBN and LBO from the glass. The Johnson–Mehl–Avrami function indicates that the crystallization mechanism of SBN belongs to an increasing nucleation rate with diffusion-controlled growth. The crystallite size of SBN ranges from 40 to 140 nm but it is confined to within 30–45 nm for LBO during the whole crystallization process. The relationship between the nano size and strain of SBN based on the Williamson–Hall method, and the change of activation energies of SBN and LBO crystallization analyzed by using the isoconversional model are discussed. A comparison of phonon modes between as-quenched glass and fully transformed crystals clearly shows that the low dimensional vibration modes in the structurally disordered glass change to highly dimensional network units with the formation of crystals.

Graphical abstract: Formation kinetics of Sr0.25Ba0.75Nb2O6 and Li2B4O7 crystals from 0.25SrO–0.75BaO–Nb2O5–Li2O–2B2O3 glass

Article information

Article type
Paper
Submitted
18 Feb 2020
Accepted
01 Apr 2020
First published
07 Apr 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 14113-14121

Formation kinetics of Sr0.25Ba0.75Nb2O6 and Li2B4O7 crystals from 0.25SrO–0.75BaO–Nb2O5–Li2O–2B2O3 glass

C. G. Baek, Y. H. Rim, J. Ko, C. Kim and Y. S. Yang, RSC Adv., 2020, 10, 14113 DOI: 10.1039/D0RA01541E

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