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Phase Transition Induced by High Pressure in a New LaBaCuGaO5 Compound

✍ Scribed by M.L. Ruiz-González; J. Ramı́rez-Castellanos; J.M. González-Calbet

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
745 KB
Volume
155
Category
Article
ISSN
0022-4596

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✦ Synopsis

The structure of a new LaBaCuGaO 5 material has been elucidated by means of X-ray di4raction (XRD), selected-area electron di4raction (SAED), and high-resolution transmission electron microscopy (HRTEM). This oxide shows the brownmillerite-type structure, built-up of alternating octahedral and tetrahedral layers sharing corners with space group Ima2 and lattice parameters a ‫؍‬ 1.6707 nm, b ‫؍‬ 0.5511 nm, and c ‫؍‬ 0.5485 nm. The presence of some structural disorder at the equatorial oxygen is discussed. When this material is treated under high pressure a phase transition takes place. Although X-ray di4raction data suggest an average cubic perovskite structure, electron di4raction and microscopy show the presence of perpendicular microdomains constituted by the intergrowth of some perovskiterelated superstructures. Paramagnetic behavior is observed in all cases.

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