Role of manganese on the structure, crystallization and sintering of non-stoichiometric lithium disilicate glasses
authors Gaddam, A; Fernandes, HR; Tulyaganov, DU; Pascual, MJ; Ferreira, JMF
nationality International
journal RSC ADVANCES
keywords TRANSITION-METAL IONS; CRYSTAL NUCLEATION KINETICS; AMORPHOUS PHASE-SEPARATION; PHYSICAL-PROPERTIES; OPTICAL-ABSORPTION; SILICATE-GLASSES; NETWORK MODIFIERS; BAO-SIO2 GLASSES; BORATE GLASSES; SPECTRA
abstract The structural role of Mn was investigated in a relatively simple non-stoichiometric lithium disilicate (Li2Si2O5) based glass composition. Glasses were prepared by partially replacing SiO2 by MnO2 from the base glass belonging to the system Li2O-K2O-Al2O3-SiO2. An overall depolymerization of the glass network was observed according to magic angle spinning nuclear magnetic resonance (MAS-NMR) and Fourier transform infrared (FTIR) spectroscopic studies, suggesting a network modifier role for Mn. However, thermal analysis, phase segregation and nucleation in the glasses suggested that Mn might also act as network former. Moreover, calculated crystal field parameters from UV-Visible spectroscopy, showing high ligand field strength (Do) and Racah inter electronic repulsion (B) indicate the possible existence of Mn as individual molecular entities in the interstitials of the glass network. This paper discusses the implications of this structural role of Mn on the crystallization of bulk glasses and on the sintering behaviour and crystallization of glass powder compacts.
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2014
volume 4
issue 26
beginning page 13581
ending page 13592
digital object identifier (doi) 10.1039/c3ra46393a
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000333082700049
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