Basic properties of α-, β′- and γ-modifications of Mn3(PO4)2

Volkova, O.S.; Shvanskaya, L.V.; Zvereva, E.A.; Ovchenkov, E.A.; Dimitrova, O.V.; Yakubovich, O.V.; Chareev, D.A.; Rahaman, B.; Saha-Dasgupta, T.; Vasiliev, A.N.

Авторы: Volkova O.S., Shvanskaya L.V., Zvereva E.A., Ovchenkov E.A., Dimitrova O.V., Yakubovich O.V., Chareev D.A., Rahaman B., Saha-Dasgupta T., Vasiliev A.N.
Сборник: Proceedings of International Symposium on Structure-Property Relationships in Solid State Material (SPSSM 2016), Nante, France, 2016
Том: 1
Тезисы
Год издания: 2016
Место издания: Institut des Materiaux Jean Rouxel Нант, Франция
Первая страница: 73
Последняя страница: 73
Аннотация: The manganese (II) orthophosphate Mn3(PO4)2 belongs to the anhydrous phosphates family of divalent metals M3(PO4)2 with M = Mg, Ca, Cr-Zn. It stands out for multiple low symmetry crystal structures and limited amount of information about their properties. The Mn3(PO4)2 compound has been reported to exist in three polymorphs: α- phase, a variety of graftonite structural type; β′- phase, characterized by superstructure to β-Zn3(PO4)2 structure type [1, 2] and γ-phase [3], topologically close to the mixed (Zn,Mn) phosphate (Zn0.75Mn0.25)3(PO4)2 with farringtonite Mg3(PO4)2 structure. All polymorphs adopt the same monoclinic space group of P21/n or P21/c (S.G. No. 14).The temperature dependences of magnetic susceptibility χ in α-,β′- and γ- modifications of Mn3(PO4)2 are shown in Fig. 1. At elevated temperatures these dependences follow the Curie-Weiss law with addition of temperature independent term χ = χ 0 + C/(T–Θ). At low temperatures, these compounds demonstrate the peaks indicating formation of the long – range antiferromagnetic order. The γ- phase possessing trimerized fragments in magnetic structure shown in the Inset to Fig. 1 demonstrates 1/3 plateau in magnetization curve. All compounds were characterized in measurements of thermodynamic and resonant properties in a wide temperature range and magnetic fields. Their magnetic exchange interactions were estimeted from first principles calculations.
Добавил в систему: Зверева Елена Алексеевна

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