Raman and infrared spectroscopy of monazite-type ceramics used for nuclear waste conditioning

J Heuser, AA Bukaemskiy, S Neumeier… - Progress in Nuclear …, 2014 - Elsevier
Raman and infrared spectroscopic investigations were performed on synthetic lanthanide
orthophosphates (LnPO 4) within this study. Seven monoclinic monazite-type phosphates …

Monazite as a promising long-term radioactive waste matrix: Benefits of high-structural flexibility and chemical durability.

N Dacheux, N Clavier, R Podor - American Mineralogist, 2013 - degruyter.com
ABSTRACT Monazite (Ln3+PO4) and related solid solutions are a well-known source of rare
earth elements on earth. They may also accommodate large amounts of thorium and …

Studies on thermal and mechanical properties of monazite-type ceramics for the conditioning of minor actinides

Y Arinicheva, A Bukaemskiy, S Neumeier… - Progress in nuclear …, 2014 - Elsevier
Lanthanum and europium phosphates with various La/Eu ratios were synthesised using the
wet-chemical microwave-assisted hydrothermal method. The thermal behaviour of the (La …

Monazite, rhabdophane, xenotime & churchite: Vibrational spectroscopy of gadolinium phosphate polymorphs

N Clavier, A Mesbah, S Szenknect… - Spectrochimica Acta Part A …, 2018 - Elsevier
Rare-earth phosphates with the general formula REEPO 4· nH 2 O belong to four distinct
structural types: monazite, rhabdophane, churchite, and xenotime. We report herein the first …

New insights into phosphate based materials for the immobilisation of actinides

S Neumeier, Y Arinicheva, Y Ji, JM Heuser… - Radiochimica …, 2017 - degruyter.com
This paper focuses on major phosphate-based ceramic materials relevant for the
immobilisation of Pu, minor actinides, fission and activation products. Key points addressed …

Benchmarking the DFT+U Method for Thermochemical Calculations of Uranium Molecular Compounds and Solids

G Beridze, PM Kowalski - The Journal of Physical Chemistry A, 2014 - ACS Publications
Ability to perform a feasible and reliable computation of thermochemical properties of
chemically complex actinide-bearing materials would be of great importance for nuclear …

Performance of DFT+U method for prediction of structural and thermodynamic parameters of monazite‐type ceramics

A Blanca Romero, PM Kowalski… - Journal of …, 2014 - Wiley Online Library
We performed a density functional theory (DFT) study of the monazite‐type ceramics using
DFT+ U method, where the Hubbard U parameters are derived ab initio, with the main goal …

A structural investigation of hydrous and anhydrous rare-earth phosphates

MR Rafiuddin, AP Grosvenor - Inorganic Chemistry, 2016 - ACS Publications
Rhabdophane-(REPO4· n H2O; RE= La to Dy), monazite-(REPO4; RE= La to Gd), and
xenotime-type (REPO4 and RE′ PO4· n H2O; RE= Tb to Lu and Y; RE′= Ho to Lu and Y) …

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

A Hirsch, P Kegler, I Alencar, J Ruiz-Fuertes… - Journal of solid state …, 2017 - Elsevier
The monazite-type solid solution La 1− x Pr x PO 4 was synthesized by solid-state reaction
and extensively investigated using electron microprobe and thermogravimetric analyses …

Thermochemistry of La1− xLnxPO4-monazites (Ln= Gd, Eu)

S Neumeier, P Kegler, Y Arinicheva, A Shelyug… - The Journal of Chemical …, 2017 - Elsevier
Enthalpy of formation (ΔH° f) of single phase orthophosphate solid solutions La 1− x Ln x PO
4 (Ln= Eu, Gd; 0< x< 1) with monazite structure has been determined by high temperature …