Effect of lithium on thermal and structural properties of zinc vanadate tellurite glass

2018 ◽  
Author(s):  
Sunita Rani ◽  
R. S. Kundu ◽  
Neetu Ahlawat ◽  
Suman Rani ◽  
Kanta Maan Sangwan ◽  
...  
Keyword(s):  
Structural Properties ◽  
Tellurite Glass

Thermal and Structural Properties of Erbium/Neodymium Co-Doped Lithium-Magnesium-Tellurite Glass

2015 ◽  
Vol 1107 ◽  
pp. 466-470 ◽  
Author(s):  
Ramli Arifin ◽  
S. Akmar Roslan ◽  
M.R. Sahar ◽  
S.K. Ghoshal ◽  
K. Hamzah
Keyword(s):  
Thermal Stability ◽  
Structural Properties ◽  
Tellurite Glass ◽  
Rare Earth Doping ◽  
X Ray Diffraction ◽  
Co Doping ◽  
Thermal Analyser ◽  
Differential Thermal Analyser ◽  
The Difference ◽  
Inorganic Glasses

Detailed characterizations of inorganic glasses via optimized rare earth doping/co-doping are challenging. Tellurite glasses with composition (78-x)TeO2-10Li2O-10MgO-2Nd2O3-xEr2O3, (where x = 0.4 to 2.0 mol%) are prepared by melt-quenching technique. The effects of Er2O3 concentration on the thermal stability and structural properties are examined. The X-ray diffraction pattern confirms the glassy nature of all samples. The temperature of glass transition (Tg), crystallization (Tc), melting (Tm) and the difference (Tc-Tg) are determined by differential thermal analyser (DTA). The values of Tc, Tg and Tm are found to vary in the range of 419-430 °C, 300-345 °C and 885-890 °C, respectively. The glass sample with 0.4 mol% Er2O3 shows highest thermal stability. The FTIR spectra measured in the range of 400 - 4000 cm1 exhibits two major absorption peaks around 1600 - 3600 cm1 and 900 - 1200 cm1 assigned to the stretching vibrational mode of OH and Te-OH respectively. Improvements in the optical and thermal properties due to co-doping may be useful for the development of tellurite glass based photonics.

A new transition metal-tellurite glass family: Electrical and structural properties

2016 ◽  
Vol 433 ◽  
pp. 68-74 ◽  
Author(s):  
S. Terny ◽  
M.A. De la Rubia ◽  
J. De Frutos ◽  
M.A. Frechero
Keyword(s):  
Transition Metal ◽  
Structural Properties ◽  
Tellurite Glass

Hardness and Structure of Er3+:Sm3+ Co-Doped Oxychloride Zinc Tellurite Glass

2017 ◽  
Vol 268 ◽  
pp. 43-47
Author(s):  
S.N. Nazhirah Mazlan ◽  
Ramli Arifin ◽  
Sib Krishna Ghoshal
Keyword(s):  
Structural Properties ◽  
Tellurite Glass ◽  
Glass Composition ◽  
Rare Earth Ions ◽  
Host Matrix ◽  
High Performing ◽  
Co Doping ◽  
Quenching Method ◽  
Ir Bands

Glass samples with composition of (64-x)TeO2 + (x)ZnO + 15 ZnCl2 + 0.5 Sm2O3 + 0.5 Er2O3 (x = 20, 25 and 30 mol%) are prepared by melt quenching method. The season for co-doping with rare earth ions such as samarium (Sm3+) and erbium (Er3+) is to explore the feasibility of their simultaneous exploitation as high performing up-converted lasing materials. The role of varying modifier of ZnO concentration in improving the hardness and structural properties are evaluated. The density is observed to reduce and ionic packing density is augmented with increasing concentration of ZnO. Glass with 25 mol% of ZnO revealed the optimum hardness of 2830 N/mm2. Incorporation of Zn2+ into the tellurite host matrix is found to shift the IR bands position slightly without altering their intensity. Bonding vibrations corresponding to bending of TeO3 unit (784-762 cm-1), stretching of TeO4 units (678-676 cm-1) and Zn-O bonds (462-452 cm-1) are evidenced. Incorporation of ZnO as modifier is established to enhance the hardness and improved the structural properties. The proposed glass composition may be useful for industrial purposes.

The effect of erbium oxide in physical and structural properties of zinc tellurite glass system

2018 ◽  
Vol 490 ◽  
pp. 35-43 ◽  
Author(s):  
S.N. Nazrin ◽  
M.K. Halimah ◽  
F.D. Muhammad ◽  
J.S. Yip ◽  
L. Hasnimulyati ◽  
...  
Keyword(s):  
Structural Properties ◽  
Tellurite Glass ◽  
Glass System ◽  
Erbium Oxide

Newborn's Preference for Faces

1996 ◽  
Vol 1 (3) ◽  
pp. 200-205 ◽  
Author(s):  
Carlo Umiltà ◽  
Francesca Simion ◽  
Eloisa Valenza
Keyword(s):  
Visual System ◽  
Structural Properties ◽  
Sensory Properties ◽  
Human Face ◽  
System Experiment ◽  
Face Experiment

Four experiments were aimed at elucidating some aspects of the preference for facelike patterns in newborns. Experiment 1 showed a preference for a stimulus whose components were located in the correct arrangement for a human face. Experiment 2 showed a preference for stimuli that had optimal sensory properties for the newborn visual system. Experiment 3 showed that babies directed their attention to a facelike pattern even when it was presented simultaneously with a non-facelike stimulus with optimal sensory properties. Experiment 4 showed the preference for facelike patterns in the temporal hemifield but not in the nasal hemifield. It was concluded that newborns' preference for facelike patterns reflects the activity of a subcortical system which is sensitive to the structural properties of the stimulus.

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