Author/Authors :
Pereira، نويسنده , , Daniel P. and de Oliveira، نويسنده , , Paulo C. and Remédios، نويسنده , , Claudio M.R. and Moreira، نويسنده , , Sanclayton G.C. and de Sousa، نويسنده , , Francisco F. and Mendes Filho، نويسنده , , J. and Freire، نويسنده , , P.T.C. and Melo، نويسنده , , F.E.A.، نويسنده ,
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.
