Mixed alkali effect in glasses containing MnO[sub 2]

2013 ◽  
Author(s):  
M. Sudhakara Reddy ◽  
Asha Rajiv ◽  
V. C. Veeranna Gowda ◽  
R. P. S. Chakradhar ◽  
C. Narayana Reddy
Keyword(s):  
Mixed Alkali ◽  
Mixed Alkali Effect

scholarly journals Influence of glass network ionicity on the mixed‐alkali effect

2020 ◽  
Vol 11 (3) ◽  
pp. 396-414
Author(s):  
Courtney Calahoo ◽  
Yang Xia ◽  
Ru Zhou
Keyword(s):  
Glass Network ◽  
Mixed Alkali ◽  
Mixed Alkali Effect

scholarly journals OPTICAL PROPERTIES ON Li2O-K2O-WO3-B2O3 GLASS SYSTEM

2013 ◽  
Vol 22 ◽  
pp. 278-283
Author(s):  
A. EDUKONDALU ◽  
M. A. SAMEE ◽  
SHAIKH KAREEM AHMMAD ◽  
SAIR MD. TAQIULLAH ◽  
SYED RAHMAN ◽  
...  
Keyword(s):  
Glass Structure ◽  
Glass System ◽  
Alkali Concentration ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Mixed Alkali ◽  
Absorption Studies ◽  
Mixed Alkali Effect ◽  
Oxide Ion ◽  
B2o3 Glass

Mixed alkali tungsten borate glasses xLi2O–(30–x) K2O–10WO3–60B2O3 (0 < x < 30) were prepared from the melts. These glasses were characterized using X-ray diffraction, differential scanning calorimetry and density measurements. Optical absorption studies were carried out as a function of alkali content to look for mixed alkali effect (MAE) on the spectral properties of these glasses. From the study of ultraviolet absorption edge, the optical band gap energies and Urbach energies were evaluated. The average electronic polarizability of the oxide ion, optical basicity and the interaction parameters were also evaluated for all the glasses. Many of these parameters vary non-linearly exhibiting a minima or maxima with increasing alkali concentration, indicating the mixed alkali effect. An attempt is made to interpret MAE in this glass system in terms of its glass structure.

scholarly journals Monte Carlo simulation of the mixed alkali effect with cooperative jumps

2000 ◽  
Vol 62 (6) ◽  
pp. 8790-8793 ◽  
Author(s):  
Junko Habasaki ◽  
Yasuaki Hiwatari
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Mixed Alkali ◽  
Mixed Alkali Effect

scholarly journals The Electrical Conductivity of Some Hydrous and Anhydrous Molten Silicates as a Function of Temperature and Pressure

2021 ◽  
Author(s):  
◽  
John Satherley
Keyword(s):  
Electrical Conductivity ◽  
Quartz Crystal ◽  
Pressure Coefficient ◽  
General Picture ◽  
Water Composition ◽  
Mixed Alkali ◽  
Mixed Alkali Effect ◽  
Temperature And Pressure ◽  
Increasing Temperature ◽  
Arrhenius Temperature

<p>This thesis is concerned with the measurement and interpretation of electrical conductivity in molten silicates. Physicochemical properties and structural models of silica and silicates are reviewed first, to give a general picture of their behaviour. Electrical conductivity was measured as a function of temperature, pressure and water composition. To make these measurements an internally heated pressure vessel, designed to operate at temperatures up to 1200 degrees C and pressures up to 5 kbars was constructed. Conductivity measurements were made on the following anhydrous and hydrous silicate melts: SiO2/Na2O 60/40, 65/35, 75/25, 78/22 mol%; SiO2/Na2O/CaO 72/24/4 mol%; Mt. Erebus lava; SiO2/Na2O 78/22 mol% + ~5 wt% H2O and Mt. Erebus lava + ~4 wt% H2O in the temperature range 850-1000 degrees C and the pressure range 0-1.3 kbar. Arrhenius temperature and pressure dependencies on conductivity were observed. The pressure coefficient of conductivity was zero for the anhydrous melts well above Tg but small and positive for the hydrous silicates. Water caused ~40% reduction in conductivity when added to a melt which was accounted for in terms of the mixed alkali effect. Conductivity isobars for the hydrous silicates passed through a maximum as a function of increasing temperature. The conductivity behaviour as a function of temperature and pressure is analogous to that observed in partially ionised liquids and is intrepretated in an identical way. The range of operation of a piezoelectric alpha-quartz crystal viscometer was extended to allow measurement of viscosity as a function of temperature.</p>

EPR, optical, photoluminescence studies of Cr3+ ions in Li2O–Cs2O–B2O3 glasses – An evidence of mixed alkali effect

2010 ◽  
Vol 975 (1-3) ◽  
pp. 93-99 ◽  
Author(s):  
C.R. Kesavulu ◽  
R.P.S. Chakradhar ◽  
C.K. Jayasankar ◽  
J. Lakshmana rao
Keyword(s):  
Mixed Alkali ◽  
Mixed Alkali Effect ◽  
Photoluminescence Studies
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