Original close-packed structure and magnetic properties of the Pb4Mn9O20 manganite

Artem M. Abakumov, Joke Hadermann, Alexander A. Tsirlin, Haiyan Tan, Jo Verbeeck, Haitao Zhang, Evgeny V. Dikarev, Roman V. Shpanchenko, Evgeny V. Antipov

Результат исследований: Вклад в журналСтатьярецензирование

6 Цитирования (Scopus)

Аннотация

The crystal structure of the Pb4Mn9O20 compound (previously known as "Pb0.43MnO2.18") was solved from powder X-ray diffraction, electron diffraction, and high resolution electron microscopy data (S.G. Pnma, a=13.8888(2) Å, b=11.2665(2) Å, c=9.9867(1) Å, RI=0.016, RP=0.047). The structure is based on a 6H (cch)2 close packing of pure oxygen "h"-type (O16) layers alternating with mixed "c"-type (Pb4O12) layers. The Mn atoms occupy octahedral interstices formed by the oxygen atoms of the close-packed layers. The MnO6 octahedra share edges within the layers, whereas the octahedra in neighboring layers are linked through corner sharing. The relationship with the closely related Pb3Mn7O15 structure is discussed. Magnetization measurements reveal a peculiar magnetic behavior with a phase transition at 52 K, a small net magnetization below the transition temperature, and a tendency towards spin freezing.

Язык оригиналаАнглийский
Страницы (с-по)2231-2238
Число страниц8
ЖурналJournal of Solid State Chemistry
Том182
Номер выпуска8
DOI
СостояниеОпубликовано - авг. 2009
Опубликовано для внешнего пользованияДа

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