Lattice dynamics and thermal properties of CaWO4
Physical Review B - Condensed Matter and Materials Physics 70:21 (2004) 1-9
Abstract:
Thermodynamic properties of CaWO4 were studied using the GULP code incorporating semiclassical simulations based on quasiharmonic lattice dynamics and static lattice minimisation methods. Free energy minimization along with so called "relax" fitting was used to obtain the parameters characterising the interatomic interaction potential. From analyses of the calculated and experimental cell sizes, thermal expansion coefficients, elastic constants, phonon density of states, heat capacity, entropy, and Grüneisen parameters it is concluded that quasiharmonic lattice dynamics give a good description of these properties of CaWO4 at temperatures up to 800 K.Detection of the natural alpha decay of tungsten
Physical Review C 70 (2004) 064606 6 pages
Two-photon excitation and luminescence of a CaWO4 scintillator
RADIAT MEAS 38:4-6 (2004) 585-588
Abstract:
Luminescence of a CaWO4 scintillator was studied in the temperature range 77-500 K using intense laser excitation in the 450-600 nm spectral region. Characteristics of the observed blue emission are similar to those of the intrinsic luminescence of calcium tungstate. The emission is concluded to be caused by cascade excitation of CaWO4 that results in a two-photon excited (TPE) luminescence. The features of TPE luminescence of CaWO4 are analysed in comparison to those obtained with UV and X-ray excitation. (C) 2004 Elsevier Ltd. All rights reserved.Limits on WIMP dark matter using scintillating CaWO4 cryogenic detectors with active background suppression
(2004)