Structural, vibrational, and thermochemical properties of the monazite-type solid solution La1–xPrxPO4

A. Hirsch, P. Kegler, I. Alencar, J. Ruiz-Fuertes, A. Shelyug, L. Peters, C. Schreinemachers, A. Neumann, S. Neumeier, H. P. Liermann, A. Navrotsky, G. Roth

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The monazite-type solid solution La1−xPrxPO4 was synthesized by solid-state reaction and extensively investigated using electron microprobe and thermogravimetric analyses, differential scanning and high-temperature oxide melt solution calorimetry, powder X-ray diffraction, infrared and Raman spectroscopy. Lattice parameters and Ln-O bond lengths show a decrease with increasing Pr content. A small excess volume is observed for the solid solution. IR spectra of the solid solution members present no detectable differences, while a blue shift of the PO4-related modes is seen in the Raman data. This shift can be attributed to the lanthanide contraction. Within errors, calorimetry data show no systematic deviation from an ideal behavior, though one might interpret the data as an indication of a slightly asymmetric mixture. All data indicate that deviations from ideality of the solid solution – if present – are very small.

Original languageEnglish (US)
Pages (from-to)82-88
Number of pages7
JournalJournal of Solid State Chemistry
StatePublished - Jan 1 2017
Externally publishedYes


  • Calorimetry
  • Enthalpy of mixing
  • Monazite
  • Powder X-ray diffraction
  • Raman spectroscopy
  • Rare earth phosphate
  • Solid solution

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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