The synthesis and thermodynamic properties of strontium fluoromanganite Sr2.5Mn6O12.5 - δf2

M. L. Kovba, Yu Ya Skolis, A. M. Abakumov, J. Hadermann, I. S. Sukhushina

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Abstract

The existence of the [SrF0.8O0.1] 2.5[Mn6O12] = Sr2.5Mn 6O12.5 - δF2 compound was established in the SrO-Mn2O3-SrF2 system at 900°C and p(O2) = 1 atm. The crystal structure of strontium fluoromanganite was determined from the X-ray powder diffraction data, electron diffraction, and high-resolution electron microscopy. It can be described in the monoclynic system with four Miller hklm indices: hklm: H = h a*+ k b*+ l c 1 * + m q 1, q 1, q 1 = c 2 * = γc 1 *, γ ≈ 0.632, a ≈ a ≈ 9.72 Å, b ≈ 9.55 Å, c 1 ≈ 2.84 Å, c 2 ≈ 4.49 Å, monoclinic angle γ ≈ 95.6°. The electromotive force method with a solid fluorine ion electrolyte was used to refine the composition of fluoromanganite and determine the thermodynamic functions of its formation from phases neighboring in the phase diagram (SrMn3O6, Mn2O3, SrF2, and oxygen), ΔG°, kJ/mol = -(111.7 ± 1.9) + (89.5 ± 1.5) × 10-3 T.

Original languageEnglish
Pages (from-to)2033-2038
Number of pages6
JournalRussian Journal of Physical Chemistry A
Volume84
Issue number12
DOIs
Publication statusPublished - Dec 2010
Externally publishedYes

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