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High-temperature investigations of the rare earth NZP phosphates R1/3Zr2(PO4)3 (R= La, Nd, Eu, Lu) by drop calorimetry

“…A number of questions still remain open, among which that of their thermodynamic properties. While thermodynamic properties of NZP phosphates with 1-and 2-valent cations in the interframework positions of the NZP structure have been reported in several papers [16][17][18], data on the phosphates with 3-valent cations, including lanthanides, were not found.…”

Thermal Expansion of NaZr2(PO4)3 Family Ceramics in a Low-Temperature Range

“…Their crystal structure consists of a rigid three-dimensional network of PO 4 tetragonals sharing corners with ZrO 6 octahedrons and a three-dimensionally linked interstitial space partially occupied by interstitial ions including alkali and alkalineearth metal ions. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The thermal expansion of NZP family ceramics is greatly influenced by the interstitial ions: larger ionic radii or fewer interstitial ions result in low expansion. The thermal properties and crystallographic structure of a wide variety of NZP family ceramics have been studied at temperatures above room temperature (RT).…”

“…The thermal properties and crystallographic structure of a wide variety of NZP family ceramics have been studied at temperatures above room temperature (RT). [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] However, those investigations evaluated thermal expansion above RT, and no investigations have been conducted below RT. This work aims to clarify the thermal expansion properties of NZP family ceramics in a temperature range from below RT to much higher than RT.…”

Thermodynamic properties of trizirconium tetraphosphate

“…Till date there are the results of a thermodynamic study on compositions MZr 2 (PO 4 ) 3 (M = Na, K, Rb, or Cs) [6,7] and on the compounds Na 1 + x Zr 2 -Si x P 3 À x O 12 [8,9], Na 3 M 2 (PO 4 ) 3 (M 2 = Fe 2 , Cr 2 , ZrMg) [10,11], Na 5 Zr(PO 4 ) 3 [12,13], Ca 0.5 M 2 (PO 4 ) 3 (M = Zr, Hf) and Sr 0.5 M 2 (PO 4 ) 3 (M = Ti, Zr) [14]. This paper describes a similar study of Zr 3 (PO 4 ) 4 .…”