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Effect of Non-stoichiometry on Some Properties of Lead Tungstate Single Crystals by S.C. Sabharwal; Sangeeta; D.G. Desai; S.C. Karandikar; A.K. Chauhan; A.K. Sangiri; K.S. Keshwani; M.N. Ahuja is a Engineering article available to read on EtoBox.

What is Effect of Non-stoichiometry on Some Properties of Lead Tungstate Single Crystals about?

The effect of stoichiometric deviations on the optical absorption, gamma rays induced absorption and thermoluminescence (TL) from PbWO4 (PWO) single crystals has been investigated. The stoichiometric deviations are found to develop yellowish coloration in this crystal. This problem has been overcome by purifying the starting powder for minute stoichiometric deviations through repeated crystallisations. In the case of non-stoichiometric crystals a broad absorption over the wavelength range 400-5(X) nm is observed. This absorption gets further enhanced when the crystal is subjected to 3,-ray irradiation. Whereas, the stoichiometric crystals, which are colourless, are found not to develop coloration for gamma exposures as high as 10 Mrad. The presence of weak TL in both types of crystals is observed for the radiation exposures of 10 Mrad. For colourless crystals, only one TL glow peak at 170°C is recorded over the temperature range 30-400°C. A shift in the glow peak temperature towards the lower temperature side is observed in the case of non-stoichiometric crystals. This result can be used to detect minute stoichiometric deviations in PWO.

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Author

S.C. Sabharwal; Sangeeta; D.G. Desai; S.C. Karandikar; A.K. Chauhan; A.K. Sangiri; K.S. Keshwani; M.N. Ahuja

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-0248)

Published

1996

Language

EN

Field

Engineering (Physical Sciences)