A neutron powder diffraction study of Na1-x Srx TaO3 (x = 0.2 and 0.3)статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Black powder samples of the reduced oxotantalates Na1−xSrxTaO3 x = 0.2 and 0.3 were prepared via solid state reactions from
appropriate amounts of NaTaO3, Sr5Ta4O15 and Ta (99.99%) in sealed tantalum ampoules at 1500◦C. They crystallize in variants of
the perovskite type structure (aper). According to structural refinements from neutron powder diffraction data Na0.8Sr0.2TaO3 crystallizes
orthorhombic in the GdFeO3 type structure with unit cell parameters a ≈ 2 × aper, b ≈ 2 × aper, c ≈ 2 × aper and space group Pnma.
The structure of the more reduced phase Na0.7Sr0.3TaO3 is tetragonal with unit cell parameters a ≈ 2 × aper, c ≈ 2 × aper and space group P4/mbm.