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Structural Phase Transition of Orthorhombic LaCrO3 Studied by Neutron Powder Diffraction

✍ Scribed by K. Oikawa; T. Kamiyama; T. Hashimoto; Y. Shimojyo; Y. Morii

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
227 KB
Volume
154
Category
Article
ISSN
0022-4596

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✦ Synopsis

An orthorhombic to a rhombohedral structural phase transition of LaCrO 3 has been studied by the neutron powder di4raction over the temperature range of 295+1013 K. At the phase transition around 2603C, the negative volume expansion was observed, and the amount of the volume compression was estimated to be ؊0.081375 A s 3 (؊0.138%) per formula unit. The coe7cients of volume thermal expansion, ؊(1/V )/(*V/*T ) , were estimated to be 2.285(16)Ψ‹10 ؊5 K ؊1 and 2.842(12)Ψ‹10 ؊5 K ؊1 for the orthorhombic and rhombohedral phases, respectively. The Rietveld re5nement revealed that the volume compression at the phase transition was principally due to the shrinking of the [CrO 6 ] octahedra.

πŸ“œ SIMILAR VOLUMES

Structural Phase Transition and Nonstoic
Structural Phase Transition and Nonstoichiometry of Li2FeCl4β€”Neutron Diffraction Studies
✍ H.D. Lutz; A. Pfitzner; J.K. Cockcroft πŸ“‚ Article πŸ“… 1993 πŸ› Elsevier Science 🌐 English βš– 157 KB

Neutron powder diffraction studies have been performed on \(\mathrm{Li}_{2} \mathrm{FeCl}_{4}\) at 298,498 , and \(698 \mathrm{~K}\). The resulting powder profiles were fitted by the Rietveld method to final \(R_{\mathrm{I}}=6.9,3.2\), and \(4.0 \%\), respectively. The orthorhombic room-temperature