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Hexagonal Na1.5Y1.5F6 at High Pressures

✍ Scribed by A. Grzechnik; P. Bouvier; M. Mezouar; M.D. Mathews; A.K. Tyagi; J. Köhler

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
263 KB
Volume
165
Category
Article
ISSN
0022-4596

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✦ Synopsis

The high-pressure behavior of hexagonal Na 1.5 Y 1.5 F 6 is investigated with synchrotron angle-dispersive X-ray powder di4raction in a diamond anvil cell up to 22 GPa at room temperature. There is no major phase transition in this material in the entire pressure region studied here. At near ambient pressures, the structure is of the Na 1.5 Nd 1.5 F 6 type (P6 , Z ‫؍‬ 1), found in other low-temperature sodium lanthanide 6uorides. Pressure-induced order+ disorder phenomena lead to the formation of the gagarinite structure (P6 3 /m, Z ‫؍‬ 1) above 20 GPa. Alternatively, the pressure-induced order+disorder phenomena could be related to a polymorphic transition towards the phase of the -Na 2 ThF 6 type with P6 2m (Z ‫؍‬ 1) symmetry. There is no volume change associated with all these reversible structural changes.

2002

Elsevier Science (USA)

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