Details

Autor(en) / Beteiligte

• Sedmidubsky, D.
• Strejc, A.
• Benes, O.
• Ruzicka, K.
• Hejtmanek, J.
• Javorsky, P.
• Nevriva, M.
• Martin, C.

Titel

Energetics of charge order transition in Bi{sub 1-x}Sr{sub x}MnO{sub 3}

Ist Teil von

• Journal of solid state chemistry, 2006-12, Vol.179 (12)

Ort / Verlag

United States

Erscheinungsjahr

2006

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The transition from the high-temperature pseudocubic form of the perovskite manganites Bi{sub 1-x}Sr{sub x}MnO{sub 3}, x=0.3,0.5,0.8, to their orthorhombically distorted charge-ordered state is examined. As the experimental probe the measuring of the heat capacity by heat flux DSC incremental method above 300K and by relaxation method below 300K is used. While a broad symmetrical transition spanning the temperature interval {delta}T{approx}500K with a maximum at the apparent T{sub CO}{approx}500K is observed for x=0.5, the other two compositions reveal typical {lambda}-shaped peaks often considered as typical for the second order transitions. The total entropy release on heating is interpreted in terms of a simultaneous change of charge, orbital and spin degree of freedom.