Characterisation of semiconducting V2O5–Bi2O3–TeO2 glasses through ultrasonic measurements

Rajendran, V.; Palanivelu, N.; Chaudhuri, B. K.; Goswami, K.

doi:10.1016/s0022-3093(03)00018-8

Cited by 153 publications

(76 citation statements)

References 36 publications

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“…It can be seen that the density increases from 4.71 to 4.97 g cm¯3 and the molar volume increases from 28.24 to 28.50 cm 3 . The dependence of density and molar volume on composition is in agreement with the weight and size of the constituent oxides.…”

Section: Resultsmentioning

confidence: 94%

“…Tellurium oxide (TeO 2 ) is a conditional glass former [2] and forms glass only with a modifier such as alkali, alkaline earth and transitional metal oxides or other glass formers. In a binary tellurite glasses, the basic structural unit of TeO 4 is a trigonal bipyramid (tbp) with lone pair of electrons and the structural units take the Te-O-Te bond for glass formation [3] . Ultrasonic nondestructive character of materials is a versatile tool for investigating the change in microstructure, deformation process and mechanical properties of materials over a wide range of temperatures [4] .…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic Study and Physical Properties of Borotellurite Glasses

Halimah¹,

Sidek²,

Daud³

et al. 2005

American J. of Applied Sciences

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A series of glasses (TeO 2 ) x (B 2 O 3 ) 1-x with x = 0. 6, 0.63, 0.65, 0.70, 0.73, 0.75, 0.78 and 0.80 were synthesized by rapid quenching. Longitudinal and shear ultrasonic velocity were measured at room temperature and at 5 MHz frequency. Elastic properties, Poisson's ratio and micro hardness have been calculated from the measured density and ultrasonic velocity at room temperature. Estimated parameters based on Makishima-Mackenzie theory and bond compression model were calculated in order to analyze the experimental elastic moduli. Comparison between the experimental elastic moduli data obtained in the study and the calculated theoretically by other models has been discussed.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Ultrasonic Study and Physical Properties of Borotellurite Glasses

Halimah¹,

Sidek²,

Daud³

et al. 2005

American J. of Applied Sciences

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“…Rajendran et al [3,14] and Bridge et al [15][16][17] proposed that a high cross-link density has Poisson's ratio in the order of 0. [8] .…”

Section: Resultsmentioning

confidence: 99%

“…TeO 2 and B 2 O 3 are known as glass forming oxides. The structure of tellurite glass is a laminar network based on triangular TeO 3 pyramids or square TeO 4 pyramids [3] . Boron oxide B 2 O 3 in its glassy form is a laminar network consisting of boron atoms 3-fold coordinated with oxygen which can form six-membered boroxol rings (B 3 O 6 ), as reported earlier by KroghMoe [4] .…”

Section: Introductionmentioning

confidence: 99%

Structural Analysis of Borotellurite Glass

Halimah¹,

Daud²,

Sidek³

et al. 2007

American J. of Applied Sciences

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Abstract:The average cross-link density, number of the network bonds per unit volume, average stretching force constant, atomic ring size and the ratio K bc /K e have been calculated and discussed according to bond compression model for borotellurite glass. The result showed that the connectivity and rigidity of the borotellurite glasses increases with TeO 2 content due to the transformation of BO 3 units to BO 4 and TeO 3 units to TeO 4 . Comparison between theoretical calculated and experimental elastic moduli and Poisson's ratio has been carried out. The results showed good agreement between experimental and theoretical calculated elastic moduli.

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“…Trigonal pyramidal units form chains while [TeO 4/2 ] 0 tbp units lead to three-dimensional structures [30]. Bismuth from Bi 2 O 3 generally tends to occupy octahedral positions in glass structure [31,32]. The additional oxygens required for octahedral coordination of Bi are provided by the oxygen atoms in the host matrix through non-bonding coordination, because .…”

Section: Introductionmentioning

confidence: 99%