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Coloration, photoconductivity, photo‐ and thermoluminescence of PbMoO 4 crystals
Author(s) -
Bollmann W.
Publication year - 1980
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19800150320
Subject(s) - thermoluminescence , ion , annealing (glass) , photoconductivity , irradiation , materials science , analytical chemistry (journal) , absorption (acoustics) , absorption spectroscopy , absorption band , oxygen , chemistry , luminescence , optics , optoelectronics , metallurgy , environmental chemistry , physics , organic chemistry , nuclear physics , composite material
An absorption band at 435 nm with a half‐value width of 0.57 eV which causes the yellowish colour of PbMoO 4 crystals is due to Pb 3+ ions. Pb 3+ ions are produced by oxidation of the crystals or by incorporation of foreign cations of oxidation state lower than 6 at Mo 5+ sites. Usual Pb 3+ ion mole fractions are ⪅ 10 −7 . Annealing of the crystals at low oxygen partial pressure discolours them. Colourless crystals become coloured at low temperatures by ionizating irradiation causing absorption bands at 380 and 575 nm due to Mo 5+ ions and at about 990 nm due to an other electronic centre (may be Pb + or F centre). Heating causes a thermoluminescence connected with disoloration which is finished at room temperature.