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Powder Neutron Diffraction Studies of Na2Ti2Sb2O and Its Structure–Property Relationships

✍ Scribed by Tadashi C Ozawa; Rigo Pantoja; Enos A Axtell III; Susan M Kauzlarich; John E Greedan; Mario Bieringer; James W Richardson Jr.

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
220 KB
Volume
153
Category
Article
ISSN
0022-4596

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✦ Synopsis

The structure of Na 2 Ti 2 Sb 2 O has been investigated by temperature-dependent powder neutron di4raction. Na 2 Ti 2 Sb 2 O crystallizes in I4/mmm symmetry. The structure of this phase can be viewed as an anti-K 2 NiF 4 type where Ti 3؉ ion is located between two oxygen atoms forming a square-planar lattice. Powder neutron di4raction studies of Na 2 Ti 2 Sb 2 O indicate that this compound has a structural distortion in the [Ti 2 Sb 2 O] 2؊ layer at T+120 K. This transition corresponds well to the previously reported anomalous transition temperature of the magnetic susceptibility and electronic resistivity. Several models to explain the data are presented and discussed.

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