Articles written in Bulletin of Materials Science
Volume 14 Issue 3 June 1991 pp 681-686 International Conference On Superconductivity—II
Doppler-broadened positron annihilation studies in Y-Ba-Cu-O, Tl-Ca-Ba-Cu-O and Bi-Ca-Sr-Cu-O superconductors
P K Pujari T Datta Satya Prakash S B Manohar I K Gopalakrishnan G M Phatak J V Yakhmi PVPSS Sastry R M Iyer
Doppler-broadened annihilation radiation spectra have been measured as a function of temperature from 77 K to 300 K, for several high temperature oxide superconductors viz single-phase YBCO, single- and mixed-phase Tl-Ca-Ba-Cu-O and Bi-Ca-Sr-Cu-O compounds. The temperature-dependent parameters extracted respond to a change at the onset of superconducting transition. The observations point to involvement of oxygen valence electrons at the onset of superconducting transition. Also a possible structural change and/or increase in electron density at the oxygen vacancy/defect sites seem to accompany the transition. In addition, the parameters derived are seen to be sensitive to the presence of more than one superconducting phases in mixed phase samples.
Volume 19 Issue 2 April 1996 pp 373-381
Crystallization of glass in fireclay refractories: part II: Detailed study on the mullite crystal content of the ‘synthetic’ glass
A glass of composition similar to that found in fireclay refractories was synthesized and subsequently nucleated with Cr2O3, V2O5 and TiO2. These glasses were heat-treated for crystallization of the mullite phase. The mullite content, the crystallization of mullite and the effect of temperature on the rate were investigated. The concentration of the nucleating oxides and the size and charge of their cations influence both the mullite content obtained and the crystallization rate.
Volume 19 Issue 2 April 1996 pp 383-392
Crystallization of glass in fireclay refractories; part III: Detailed study on the mullite crystal size in the ‘synthetic’ glass
Poor-grade fireclay products contain substantial amount of glass. A glass of similar composition was synthesized, nucleated and heat-treated for crystallization of mullite. The size and size-distribution of mullite crystals, the rate of change of size and the aspect ratio of the crystals were investigated in relation to the nucleating agents and temperature.
Volume 46, 2023
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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