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.

The mixed alkali effect in the MgO–Li2O–Na2O–K2O–B2O3 glass system

2016 ◽  
Vol 57 (5) ◽  
pp. 227-229
Author(s):  
Abdul Hameed ◽  
◽  
Md. Shareefuddin ◽  
M. Narasimha M. Narasimha Chary ◽  
Keyword(s):  
Glass System ◽  
Mixed Alkali ◽  
Mixed Alkali Effect ◽  
B2o3 Glass

scholarly journals Synthesis, structural characterization and ionic conductivity of mixed alkali titanium phosphate glasses

2018 ◽  
Vol 7 (5) ◽  
pp. 328-336 ◽  
Author(s):  
Fatima Ezzahraa Dardar ◽  
Michael Gross ◽  
Saida Krimi ◽  
Michel Couzi ◽  
Abdessadek Lachgar ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Physical Properties ◽  
Glass Structure ◽  
Phosphate Glasses ◽  
X Ray Diffraction ◽  
Mixed Alkali ◽  
Tio6 Octahedra ◽  
Mixed Alkali Effect ◽  
Density Values ◽  
Pass Through

Glasses with formula Na3-xLixCaTi(PO4)3 [10(3-x) mol. % Na2O - 10x mol. % Li2O - 20 mol. % CaO - 20 mol. % TiO2 - 30 mol. % P2O5] (0 ≤ x ≤ 3) were prepared by standard melt-quenching technique, and their structural and physical properties were characterized by thermal analysis, density measurements, Raman, and impedance spectroscopy. When Na+ is gradually replaced by Li+ , molar volume, glass transition temperature (Tg) and ionic conductivity values decrease, pass through a minimum around the composition x = 1.5, then increase, while density values increase, pass through a maximum, then decrease. The non-linear variation of these physical properties is a result of the classical mixed alkali effect. Powder X-ray diffraction shows that crystallization of the glasses leads to the formation of a Nasicon phase for the compositions x = 0 and x = 0.5, and to a mixture of phases for the other compositions. Raman spectroscopy study shows that the glass structure contains P2O7 and PO4 groups, and short -Ti-O-Ti-O-Ti- chains, formed by TiO6 octahedra linked to each other through corners. These chains are linked by phosphate tetrahedra to form -O-Ti-O-P-O- linkages.

Mixed-Alkali Effect in Li2O–Na2O–K2O–B2O3 Glasses: Infrared and Optical Absorption Studies

2013 ◽  
Vol 42 (8) ◽  
pp. 2516-2524 ◽  
Author(s):  
M.A. Samee ◽  
A. Edukondalu ◽  
Shaik Kareem Ahmmad ◽  
Sair Md. Taqiullah ◽  
Syed Rahman
Keyword(s):  
Optical Absorption ◽  
Mixed Alkali ◽  
Absorption Studies ◽  
Mixed Alkali Effect

scholarly journals Electrical Conductivity Enhancement of V2O5-P2O5-Bi2O3 Glasses by Nanocrystallization

2021 ◽  
Author(s):  
F. A. Ibrahim
Keyword(s):  
Electrical Conductivity ◽  
Glass Ceramic ◽  
Glass Structure ◽  
Dc Conductivity ◽  
Glass System ◽  
X Ray Diffraction ◽  
Conductivity Enhancement ◽  
Average Grain Size ◽  
Structural And Electrical Properties ◽  
Xrd Patterns

AbstractThe structural and electrical properties of the xP2O5-(40 − x) Bi2O3-60V2O5 (0 ≤ x ≤ 20) glass system have been investigated. The samples were prepared by the conventional melt-quenching technique. X-ray diffraction (XRD) patterns confirmed the amorphous nature of the present glasses. Nanocrystalline grains were found due to the annealing of the glass samples under study. Nanocrystals with an average grain size of 22 nm were implanted in the glass structure and estimated from the XRD patterns of the glass–ceramic samples. DC conductivity of the glass system has been determined in the temperature range 300–500 K. It was found that the general behavior of electrical conductivity was similar for all the glass compositions and found to decrease with increasing phosphate content. The electrical conductivity of the glass–ceramic nanocrystals obtained by annealing at crystallization temperature (Tc) was much higher than the initial glass. The activation energy (W) was enhanced by annealing and was obtained from plots of temperature-dependent DC conductivity, and found to be 0.23–0.31 eV for glasses and 0.19–0.23 eV for the glass–ceramic nanocrystals.

Mixed-alkali effect on hardness and indentation-loading behavior of a borate glass system

2020 ◽  
Vol 548 ◽  
pp. 120314
Author(s):  
Zhitao Shan ◽  
Yanfei Zhang ◽  
Shujiang Liu ◽  
Haizheng Tao ◽  
Yuanzheng Yue
Keyword(s):  
Borate Glass ◽  
Glass System ◽  
Mixed Alkali ◽  
Mixed Alkali Effect

Mixed alkali effect in optical properties of lithium–potassium bismuth borate glass system

2004 ◽  
Vol 58 (5) ◽  
pp. 694-698 ◽  
Author(s):  
A Agarwal ◽  
V.P Seth ◽  
S Sanghi ◽  
P Gahlot ◽  
S Khasa
Keyword(s):  
Optical Properties ◽  
Borate Glass ◽  
Glass System ◽  
Bismuth Borate ◽  
Mixed Alkali ◽  
Mixed Alkali Effect ◽  
Bismuth Borate Glass
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