Structural and spectroscopic properties of M{sup I}Th{sub 2}(PO{sub 4}){sub 32} (M = Cu{sup +}, Ag{sup +}, Na{sup +}, K{sup +})

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(96)00139-0· OSTI ID:409700

Arsalane, S; Ziyad, M ^[1]

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1. Faculte des Sciences, Rabat (Morocco). Lab. de Physico-Chimie des Materiaux et Catalyse

Phosphates of general formulae M{sup I}Th{sub 2}(PO{sub 4}){sub 3} where M = Cu{sup +} and Ag{sup +} were synthesized using sol-gel type methods and Cu{sup +}/Ag{sup +} ion exchange. Their structures were investigated by X-ray diffraction, FTIR, and {sup 31}P MAS NMR spectroscopies. AgTh{sub 2}(PO{sub 4}){sub 3} and NaTh{sub 2}(PO{sub 4}){sub 3} were found to be isostructural. Their {sup 31}P NMR spectra exhibit three resonances agreeing with the noncentrosymmetric space group Cc to which they belong. On the other hand, CuTh{sub 2}(PO{sub 4}){sub 3} does not show a real crystallographic resemblance with the other M{sup I}Th{sub 2}(PO{sub 4}){sub 3} phosphates of this family. Its {sup 31}P NMR spectrum is similar to that of KTh{sub 2}(PO{sub 4}){sub 3} and exhibits two sharp resonances in good agreement with the C2/c space group. Nevertheless, the [PO{sub 4}] groups in this phosphate are highly distorted because of the linear coordination of the Cu{sup +} copper ions.

• OSTI ID: 409700
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 12 Vol. 31; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMMONIUM PHOSPHATES
AQUEOUS SOLUTIONS
COPPER PHOSPHATES
CRYSTAL STRUCTURE
FOURIER TRANSFORM SPECTROMETERS
INFRARED SPECTRA
LATTICE PARAMETERS
MONOCLINIC LATTICES
NITRATES
NUCLEAR MAGNETIC RESONANCE
PHOSPHORUS 31
POTASSIUM PHOSPHATES
SILVER PHOSPHATES
SODIUM PHOSPHATES
SOL-GEL PROCESS
STOICHIOMETRY
THORIUM PHOSPHATES
X-RAY DIFFRACTION