Syntheses and Crystal Structures of Rare-Earth Oxyapatites Ca2RE8(SiO4)(6)O-2 (RE = Pr, Tb, Ho, Tm)

Chong Saehwa; Riley Brian J.; Nienhuis Emily T.Lee DongjinMcCloy John S.

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Syntheses and Crystal Structures of Rare-Earth Oxyapatites Ca2RE8(SiO4)(6)O-2 (RE = Pr, Tb, Ho, Tm)

机译：Syntheses and Crystal Structures of Rare-Earth Oxyapatites Ca2RE8(SiO4)(6)O-2 (RE = Pr, Tb, Ho, Tm)

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Four different rare-earth oxyapatites of Ca2RE8(SiO4)(6)O-2 (RE=Pr, Tb, Ho, Tm) were synthesized using a solution-based method followed by drying, calcination, and high-temperature sintering in air. X-ray powder diffraction and Raman spectroscopy were performed on the synthesized oxyapatites. The RE oxyapatites crystallize in the hexagonal space group P6(3)/m with similar unit cell parameters, increasing linearly with larger RE cations. The unit cell volumes increase linearly whereas the densities decrease nonlinearly with larger RE cations. Raman spectra showed intense bands of the symmetric bending and stretching modes of SiO4 at similar to 400 and 860 cm(-1) regions, respectively. The bands generally shifted to higher frequencies with smaller RE cations in the structures.

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来源
《Journal of chemical crystallography》 |2021年第3期|293-300|共8页
作者
Chong Saehwa; Riley Brian J.; Nienhuis Emily T.Lee DongjinMcCloy John S.;
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作者单位

Pacific Northwest Natl Lab;

Pohang Univ Sci & Technol;

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正文语种英语
中图分类晶体学;
关键词
Oxyapatite; Rare-earth oxyapatite; X-ray diffraction; Raman spectroscopy; FLUOROSILICATE APATITE; RAMAN-SPECTRA; WASTE FORMS; ND; SM; CA2ND8(SIO4)(6)O-2; CONDUCTIVITY; SILICATES; LANTHANUM; SERIES;

Syntheses and Crystal Structures of Rare-Earth Oxyapatites Ca2RE8(SiO4)(6)O-2 (RE = Pr, Tb, Ho, Tm)

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