Number of the records: 1
Neutron diffraction and heat capacity studies of PrCoO.sub.3./sub. and NdCoO.sub.3./sub..
- 1.
SYSNO ASEP 0331991 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Neutron diffraction and heat capacity studies of PrCoO3 and NdCoO3. Title Neutronová difrakce a specifické teplo sloučenin PrCoO3 a NdCoO3. Author(s) Knížek, Karel (FZU-D) RID, ORCID
Hejtmánek, Jiří (FZU-D) RID, ORCID
Jirák, Zdeněk (FZU-D) RID, ORCID, SAI
Tomeš, P. (CZ)
Henry, P. (FR)
André, G. (FR)Source Title Physical Review. B - ISSN 1098-0121
Roč. 79, č. 13 (2009), 134103/1-134103/7Number of pages 7 s. Language eng - English Country US - United States Keywords LnCoO3 ; spin transitions ; neutron diffraction ; specific heat Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GA202/09/0421 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000265942800032 DOI 10.1103/PhysRevB.79.134103 Annotation The crystal structures of perovskites NdCoO3 and PrCoO3 have been studied by neutron powder diffraction over a temperature range from 100 to 1000 K. An anomalous isotropic expansion of CoO6 octahedra is observed at two successive temperatures corresponding to the spin transitions of Co3+ from low spin (LS) (S=0) to high spin (HS) (S=2) and intermediate spin (IS) (S=1). At the second spin transition, a significant change in the octahedral tilt is encountered, as well. The heat capacity measurements show broad excess peaks at both transitions and the integral entropy change for each of them is estimated to be ~10 J K-1 mol-1. The structural and specific heat anomalies are interpreted within the LS-LS/HS-IS model of the Co3+ spin transitions. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2010
Number of the records: 1