Structural transitions in La0.95Ba0.05Mn0.9857Fe0.02O3 under heat treatmentстатья
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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Аннотация:Structural transitions in polycrystalline Ba-doped lanthanum manganite
La0.95Ba0.05Mn0.98Fe0.02O3+δ have been investigated under different cooling conditions
after vacuum annealing (fast and slow cooling) by Mössbauer spectroscopy
and X-ray diffraction (XRD) analysis. A rhombohedral structure of the synthesized
La0.95Ba0.05Mn0.98Fe0.02O3+δ sample transfers into a mixture of the orthorhombic
PnmaI, PnmaII* and PnmaII phases (common space group Pnma) with a stoichiometric
oxygen composition under vacuum annealing. The further vacuum annealing
leads to fluctuations in a partial relation of the orthorhombic phases on fast cooling.
This unusual behavior of the structural transitions are discussed.