Investigation of Single Crystals СaMoO4 with Low Residual Absorption
https://doi.org/10.17073/1609-3577-2014-3-168-173
Abstract
Calcium molybdate enriched with the isotope 100Мо (40Ca100MoO4) is a promising material for use in cryogenic scintillation detectors. The main requirements for working crystalline elements of the detector are absence of color and the value of attenuation coefficient (μ) at the wavelength of 520 nm is not higher than 0.01 cm–1. Single crystals 40Ca100MoO4 and 40Ca100MoO4 : Nb5+ are investigated. The influence of isothermal annealing on the attenuation spectra in the wavelength range 350 to 700 nm is studied. The broad absorption band with a maximum at λ = 460 nm is observed at the attenuation spectra of such samples.
The dichroism phenomenon, which is associated with anisotropy of color centers in the crystals, is found along directions perpendicular to the optical axis. The annealing of the enriched samples at temperature 1250 °C in an atmosphere of O2 leads to the substantial reduction of intensity of the band near the wavelength 460 nm.
The attenuation coefficient of the crystals 40Ca100MoO4 : Nb5+ meets the requirements is μ << 0.01 cm–1 to λ = 520 nm. Both the absorption band and dichroism are not observed in the area of 460 nm.
About the Authors
N. S. KozlovaRussian Federation
Cand. Sci. (Phys.−Math.), Senior Researcher, Head of Laboratory,
O. A. Buzanov
Russian Federation
Cand. Sci. (Eng.), Chief Researcher
M. B. Bykova
Russian Federation
Senior Engineer
E. V. Zabelina
Russian Federation
Senior Engineer
V. N. Kornoukhov
Russian Federation
Senior Researcher
A. P. Kozlova
Russian Federation
Senior Engineer
A. G. Chernykh
Russian Federation
student
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Review
For citations:
Kozlova N.S., Buzanov O.A., Bykova M.B., Zabelina E.V., Kornoukhov V.N., Kozlova A.P., Chernykh A.G. Investigation of Single Crystals СaMoO4 with Low Residual Absorption. Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering. 2014;(3):168-173. https://doi.org/10.17073/1609-3577-2014-3-168-173
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