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Transmission Electron Microscopy and Neutron Powder Diffraction Studies of GdFeO3 Type SrNbO3

✍ Scribed by H. Hannerz; G. Svensson; S.Ya. Istomin; O.G. D'yachenko

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 680 KB
Volume: 147
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8357

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✦ Synopsis

Stoichiometric SrNbO 3 ; with a GdFeO 3 type structure was synthesized between 1300 and 15503C in Ar-5lled and sealed niobium ampoules. Its crystal structure was re5ned using time-of-6ight neutron di4raction data. Space group Pnma: a ‫؍‬ (2 ) a p ‫؍‬ 5.6894(2) A > ; b ‫؍‬ 2 ' a p ‫؍‬ 8.0684(1) A > ; c ‫؍‬ (2 ' a p ‫؍‬ 5.6944(2) A > ; R F 2 ‫؍‬ 0.020; and R P ‫؍‬ 0.034. High-resolution electron microscopy and electron di4raction studies frequently revealed structural defects in SrNbO 3 . X-ray and electron di4raction studies showed cubic symmetry for SrNbO 3 synthesized below 13003C and for compounds with nominal composition Sr 0.8 NbO 3 synthesized between 1200 and 15503C. SrNbO 3 was found to be temperature independently paramagnetic.

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