High-temperature Raman spectra of KDP:Ni crystal

作者：Pereira Daniel P; de Oliveira Paulo C^*; Remedios Claudio M R; Moreira Sanclayton G C; de Sousa Francisco F; Mendes Filho J; Freire P T C; Melo F E A

来源：Solid State Communications, 2012, 152(12): 1023-1026.

DOI：10.1016/j.ssc.2012.03.026

• Ferroelectricity
• Crystal structure and symmetry

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.

• 出版日期2012-6