Infrared and Raman spectroscopic characterization of the phosphate mineral kosnarite KZr2(PO4)3 in comparison with other pegmatitic phosphates.
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2012
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Abstract
In this research, we have used vibrational
spectroscopy to study the phosphate mineral kosnarite
KZr2(PO4)3. Interest in this mineral rests with the ability of
zirconium phosphates (ZP) to lock in radioactive elements.
ZP have the capacity to concentrate and immobilize the
actinide fraction of radioactive phases in homogeneous
zirconium phosphate phases. The Raman spectrum of
kosnarite is characterized by a very intense band at
1,026 cm-1 assigned to the symmetric stretching vibration
of the PO4
3- m1 symmetric stretching vibration. The series
of bands at 561, 595 and 638 cm-1 are assigned to the m4
out-of-plane bending modes of the PO4
3- units. The
intense band at 437 cm-1 with other bands of lower
wavenumber at 387, 405 and 421 cm-1 is assigned to the
m2 in-plane bending modes of the PO4
3- units. The number
of bands in the antisymmetric stretching region supports
the concept that the symmetry of the phosphate anion in the
kosnarite structure is preserved. The width of the infrared
spectral profile and its complexity in contrast to the wellresolved
Raman spectrum show that the pegmatitic phosphates
are better studied with Raman spectroscopy.
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FROST, R. L. et al. Infrared and Raman spectroscopic characterization of the phosphate mineral kosnarite KZr2(PO4)3 in comparison with other pegmatitic phosphates. Transition Metal Chemistry, Weinheim, v. 37, p. 777-782, 2012. Disponível em: <https://link.springer.com/article/10.1007/s11243-012-9652-x>. Acesso em: 20 de jun. 2017.