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Pressure induced phase transformations in NaZr2(PO4)3 studied by X-ray diffraction and Raman spectroscopy

“…Study of structural stability as a function of pressure, temperature and substitution of cations in these open framework compounds is of great interest to establish the phase diagram of NZP. Prototype NZP is stable up to 1100 K without any phase transformation [10] but only limited studies are available on its stability with pressure [11]. These studies may also have a bearing on the consequences in case a large pressure pulse gets generated by accidental chemical events etc., at a place where this material is employed for nuclear waste management.…”

Synthesis and photoluminescence properties of MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K) phosphors

“…As a NZP structure compound, zirconium phosphates MZr 2 (PO 4 ) 3 (M = Na, K) have a rhombohedra structure. The crystal structure of MZr 2 (PO 4 ) 3 (M = Na, K) consists of a three-dimensional network of a ZrO 6 octahedral linked by corner-sharing with a PO 4 tetrahedral and sodium ions that lie in the cavities of the tetrahedron-octahedral framework, filling them partly [7][8][9]. Eu 3+ -doped alkaline metal phosphates are a class of desirable phosphors for UV excitation [10][11][12][13].…”

“…The structure of MZr 2 (PO 4 ) 3 (M = Na, K) has stability and flexibility which allows isovalent and heterovalent substitutions at all non-oxygen lattice sites and give rise to a large number of compounds with identical topology of connections between their structural units. Due to the dependence of these properties on the framework structure, MZr 2 (PO 4 ) 3 compounds have attracted significant interest for their low thermal expansion, their diversity of ionic conductivity, and catalytic properties [8,14,15] (A. R.) were used as reagents for the sample preparations. Stoichiometric amounts of the raw materials were combined into a homogeneous mixture in an agate mortar and calcined at 1200…”

Immobilisation of molybdenum from fuel reprocessing wastes into sodium zirconium phosphate ceramics

“…Moreover, the materials are resistant towards the action of c~ particles (up to 9 x 1013 particles and the same quantity of recoil atoms per 1 mg). Some phosphates with NZP structure are characterised by ultra-low thermal expansion (a near-zero value), high ionic conductivity (Na § conductivity of Nasicon solid solution systems to 0.2 ~'-1 cm-1 at 600 K) and catalytic activity [4][5][6].…”