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Non-stoichiometry defects and radiation hardness of lead tungstate crystals PbWO4

Devitsin, EG; Kozlov, VA; Potashov, SY; Terkulov, AR; Nefedov, VA; Polyansky, EV; Zadneprovski, BI; Kjellberg, Pär LU and Korbel, V (2002) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 486(1-2). p.336-344
Abstract
It has been stated many times that the formation of radiation infringements in PbWO4 is to a big extent stipulated by the non-stoichiometry defects of the crystals, arising in the process of their growth and annealing. To refine the idea of characteristics of the non-stoichiometry defects and their effect on the radiation hardness of PbWO4, the current study is aimed at the melt composition infringements during its evaporation and at optical transmission of crystals obtained in these conditions after their irradiation ((CS)-C-137 source). In the optical transmission measurements along with traditional techniques a method "in situ" was used, which provided the measurements in fixed points of the spectrum (380, 470 and 535nm) directly in the... (More)
It has been stated many times that the formation of radiation infringements in PbWO4 is to a big extent stipulated by the non-stoichiometry defects of the crystals, arising in the process of their growth and annealing. To refine the idea of characteristics of the non-stoichiometry defects and their effect on the radiation hardness of PbWO4, the current study is aimed at the melt composition infringements during its evaporation and at optical transmission of crystals obtained in these conditions after their irradiation ((CS)-C-137 source). In the optical transmission measurements along with traditional techniques a method "in situ" was used, which provided the measurements in fixed points of the spectrum (380, 470 and 535nm) directly in the process of the irradiation. X-ray phase and fluorescence analysis of condensation products of vapours over PbWO4 melt has found PbWO4 phase in their content as well as compounds rich in lead PbO, Pb2WO5 with overall ratio Pb/W (3.2). Correspondingly, the lack of lead and variations in the content of oxygen are pointed out as the major growth defects of nonstoichiometry of PbWO4 crystals. The oxygen variations are determined by the partial oxygen pressure in the atmosphere of growth or annealing of the crystals. The obtained results were compared with known conceptions of PbWO4 crystal colour centres. The possibilities of the formation of these centres accounting for the discovered loss of lead and oxygen exchange between the external medium and the crystal were considered. (C) 2002 Elsevier Science B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
electromagnetic calorimeter, radiation hardness, crystals, lead, tungstate, PWO
in
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
volume
486
issue
1-2
pages
336 - 344
publisher
Elsevier
external identifiers
  • wos:000177273200065
  • scopus:0037118545
ISSN
0167-5087
DOI
10.1016/S0168-9002(02)00730-1
language
English
LU publication?
yes
id
2b2bb9fd-c5ff-4f17-8468-2d4338ee83d3 (old id 331908)
date added to LUP
2007-08-16 08:51:25
date last changed
2017-01-01 06:57:25
@article{2b2bb9fd-c5ff-4f17-8468-2d4338ee83d3,
  abstract     = {It has been stated many times that the formation of radiation infringements in PbWO4 is to a big extent stipulated by the non-stoichiometry defects of the crystals, arising in the process of their growth and annealing. To refine the idea of characteristics of the non-stoichiometry defects and their effect on the radiation hardness of PbWO4, the current study is aimed at the melt composition infringements during its evaporation and at optical transmission of crystals obtained in these conditions after their irradiation ((CS)-C-137 source). In the optical transmission measurements along with traditional techniques a method "in situ" was used, which provided the measurements in fixed points of the spectrum (380, 470 and 535nm) directly in the process of the irradiation. X-ray phase and fluorescence analysis of condensation products of vapours over PbWO4 melt has found PbWO4 phase in their content as well as compounds rich in lead PbO, Pb2WO5 with overall ratio Pb/W (3.2). Correspondingly, the lack of lead and variations in the content of oxygen are pointed out as the major growth defects of nonstoichiometry of PbWO4 crystals. The oxygen variations are determined by the partial oxygen pressure in the atmosphere of growth or annealing of the crystals. The obtained results were compared with known conceptions of PbWO4 crystal colour centres. The possibilities of the formation of these centres accounting for the discovered loss of lead and oxygen exchange between the external medium and the crystal were considered. (C) 2002 Elsevier Science B.V. All rights reserved.},
  author       = {Devitsin, EG and Kozlov, VA and Potashov, SY and Terkulov, AR and Nefedov, VA and Polyansky, EV and Zadneprovski, BI and Kjellberg, Pär and Korbel, V},
  issn         = {0167-5087},
  keyword      = {electromagnetic calorimeter,radiation hardness,crystals,lead,tungstate,PWO},
  language     = {eng},
  number       = {1-2},
  pages        = {336--344},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment},
  title        = {Non-stoichiometry defects and radiation hardness of lead tungstate crystals PbWO4},
  url          = {http://dx.doi.org/10.1016/S0168-9002(02)00730-1},
  volume       = {486},
  year         = {2002},
}