High-temperature Raman spectra of KDP:Ni crystal
SOLID STATE COMMUNICATIONS, 152 (12):
1023-1026 (2012)DOI: 10.1016/j.ssc.2012.03.026
Abstract
High-temperature Raman scattering measurements of KDP doped with Ni (1%
weight) were performed over the spectral range 50-1200 cm(-1). The X-ray
powder diffraction patterns taken at room temperature and analyzed by
Rietveld refinement showed that doped samples of KDP:Ni have the same
tetragonal structure of a pure KDP crystal, but with a contraction of
the crystalline cell. The behavior of the high-temperature Raman spectra
indicate that two phase transitions occur, one at 413 K and another one
at 443 K. These phase transitions occur at temperatures below the
thermal dehydratation point, 488 K. DTA and TGA measurements reveals
that KDP:Ni and pure KDP have the same thermal dehydratation
temperature. (C) 2012 Elsevier Ltd. All rights reserved.