Thermal Expansion in the Zr and 1-, 2-valent Complex Phosphates of NaZr2(PO4)3 (NZP) Structure |
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| Authors: | Pet'kov V I Orlova A I Kazantsev G N Samoilov S G Spiridonova M L |
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| Institution: | (1) Department of Chemistry, Nizhni Novgorod State University, Gagarin Av. 23, 603950 Nizhni Novgorod, Russia;(2) Institute of Physics and Power Engineering, Bondarenko Sq. 1, 249020 Obninsk, Kaluga Region, Russia |
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| Abstract: | A5–4xZrxZr(PO4)3 (A=Na, K;0≤x≤1.25), Na1-xCd0.5xZr2(PO4)3 (0≤x≤1), Na5–xCd0.5xZr(PO4)3 (0≤x≤4) compositions which belong to the NZP structural family were synthesized using the sol-gel method. The lattice thermal
expansion of members of these rows were determined up to 600°C by high-temperature X-ray diffractometry. The axial thermal
expansion coefficients change from -5.8·10-6to 7.5·10-6 °C-1 (αa) and from 2.6·10–6 to 22·10–6 °C-1 (αc). These results, in addition to those for other NZP compounds allow us to explain their low thermal expansion. The mechanism
can be attributed to strongly bonded three-dimensional network structure, the existence of structural holes capable to damp
some of the thermal vibrations and anisotropyin the thermal expansion of the lattice.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | complex zirconium phosphates NZP structure thermal expansion X-ray diffraction |
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