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First observation of the reversible O3 ↔ P2 phase transition

First observation of the reversible O3 ↔ P2 phase transition,10.1016/j.materresbull.2005.11.014,Materials Research Bulletin,O. A. Smirnova,M. Avdeev,V

First observation of the reversible O3 ↔ P2 phase transition  
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According to thermal expansion data, O3-type phase NaxNi(1+x)/3Sb(2−x)/3O2 (x≈0.8) undergoes at ca. 1270K a reversible transition to a less dense form. The high-temperature phase quenched to liquid nitrogen belongs to P2 type, space group P63/mmc (no. 194), a=3.0123Å(2), c=11.2264Å(7) for x≈0.74 at 298K. The stabilisation of P2 versus O3-type structure at high temperatures seems to be due to alkali distribution over greater number of sites thus increasing entropy and decreasing Na+–Na+ repulsion.
Journal: Materials Research Bulletin - MATER RES BULL , vol. 41, no. 6, pp. 1056-1062, 2006
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