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Effect of Ca doping on the structure and scintillation properties of ZnWO 4
Author(s) -
Kraus H.,
Mikhailik V. B.,
Vasylechko L.,
Day D.,
Hutton K. B.,
Telfer J.,
Prots Yu.
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622331
Subject(s) - scintillation , monoclinic crystal system , scintillator , doping , crystal structure , diffraction , materials science , lattice constant , analytical chemistry (journal) , x ray crystallography , crystallography , chemistry , physics , optics , optoelectronics , detector , chromatography
The future application of ZnWO 4 scintillator in a cryogenic search for rare events is the motivation for optimization of this material. We present results on the effect of Ca doping on the structure and scintillation properties of ZnWO 4 . X‐ray diffraction analysis revealed that there is no mixing in the CaWO 4 –ZnWO 4 pseudobinary system due to a significant mismatch of the crystal structures of CaWO 4 and ZnWO 4 . The lattice parameters of Ca‐doped ZnWO 4 samples obtained from X‐ray powder diffraction data confirmed this finding. It is also shown that ZnWO 4 retains the monoclinic wolframite structure when cooling, at 12 K exhibiting the following lattice parameters: a = 4.6826(2) Å, b = 5.7088(2) Å, c = 4.9230(2) Å and β = 90.541(2)°. The scintillation light yield of the Zn 1− x Ca x WO 4 was measured using the multi‐photon counting technique and it is found that small concentrations of Ca ( x = 0.001 – 0.02) cause no deterioration of this parameter. Ca doping of ZnWO 4 is expected to facilitate production of a single‐crystalline scintillator. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)