Abstract
KH2PO4 (KDP) crystals doped with Mn ions were studied by an x-ray
multiple diffraction technique using synchrotron radiation at room
temperature. Asymmetric peaks were observed for both undoped and doped
crystals, a characteristic of perfect crystals. X-ray powder diffraction
at room temperature and analysis by Rietveld refinement were also
performed, showing that doped KDP has the same tetragonal structure as
undoped KDP, but with contraction of the lattice parameter for 100,
010, and 001 directions. The polarized Raman spectra of KDP and
KDP:Mn were obtained for temperatures in the range 10-300 K. Some of the
features observed in the spectra were interpreted as consequences of
phase transitions. Although group theory analysis shows that both doped
and undoped crystals have the same symmetry at room temperature, at low
temperature they have different symmetries: a previously reported phase
transition for KDP at 60 K was not observed for KDP:Mn.
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