Crystal structure, phase transition and anisotropic thermal expansion of barium zirconium diorthophosphate, BaZr(PO4)2

BaAnIV(PO4)2 (AnIV = Th, Np) – A New Family of Layered Double Phosphates

“…II MЈ IV (PO 4 ) 2 double phosphates have been intensively studied during the past two decades for applications including catalysts, ion conductors, [1] UV-emitting X-ray phosphors, [2] and also as potential host matrices for minor actinide immobilization. [3][4] Two main structural families can be distinguished, depending on the size of the cations.…”

“…The yavapaiite family, from the archetype KFe(SO 4 ) 2 (monoclinic, C2/m), [5] 2 . [1,6] In contrast, the cheralite structure (formerly known as brabantite), isotypic with the Ce III PO 4 monazite, [7] only hosts M II and MЈ IV cations similar in size with the light lanthanides, thus allowing them to occupy the same ninefold polyhedron in a disordered array. Because of the steric compatibility of tetra- [ valent actinides with large divalent cations, most of the M II An IV (PO 4 ) 2 double phosphates discovered to date belong to this family.…”

Neutron diffraction studies on Ca1−x Ba x Zr4P6O24 solid solutions

“…The observed Bragg peaks were modelled with pseudo-Voigt profile functions. It needs to be mentioned here that secondary phases like, BaZrP 2 O 8 [9] and ZrP 2 O 7 [10] were observed in some compositions. The diffraction data of these compositions were refined with multiphase contributions.…”

Structural study of polymorphism and thermal behavior of CaZr(PO4)2

“…IV (PO 4 ) 2 compounds (M II = Cd, Ca, Sr, Pb, Ba; M' IV = Ge, Ti, Mo, Sn, Hf, Zr, Pu, Np, U, Th) are subject of intensive research since they are proved to be interesting as ionic conductors, dielectrics, catalysts, ion exchangers, luminescent materials and UV-emitting Xray phosphors [1][2][3][4][5][6][7]. They also find applications in the nuclear cycle, either as host matrices for actinide radwastes or, more recently, as products of the reaction of the spent nuclear fuel with tributyl phosphate during the reprocessing [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”