Slicing the Perovskite Structure with Crystallographic Shear Planes: The AnBnO3n-2 Homologous Series

被引：26

作者：

Abakumov, Artem M. ^{[1
,2
]}

Hadermann, Joke ^{[1
]}

Batuk, Maria ^{[1
]}

D'Hondt, Hans ^{[1
]}

Tyablikov, Oleg A. ^{[2
]}

Rozova, Marina G. ^{[2
]}

Pokholok, Konstantin V. ^{[2
]}

Filimonov, Dmitry S. ^{[2
]}

Sheptyakov, Denis V. ^{[3
,4
]}

Tsirlin, Alexander A. ^{[5
]}

Niermann, Daniel ^{[6
]}

Hemberger, Joachim ^{[6
]}

Van Tendeloo, Gustaaf ^{[1
]}

Antipov, Evgeny V. ^{[2
]}

机构：

[1] Univ Antwerp, Electron Microscopy Mat Res EMAT, B-2020 Antwerp, Belgium

[2] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia

[3] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[4] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[5] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[6] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

来源：

INORGANIC CHEMISTRY | 2010年 / 49卷 / 20期

关键词：

OXIDE; CHEMISTRY;

D O I：

10.1021/ic101233s

中图分类号：

O61 [无机化学];

学科分类号：

070301 [无机化学];

摘要：

A new A(n)B(n)O(3-n) homologous series of anion-deficient perovskites has been evidenced by preparation of the members with n = 5 (Pb2.9Ba2.1Fe4TiO13) and n = 6 (Pb3.8Bi0.2Ba2Fe4.2Ti1.8O16) in a single phase form. The crystal structures of these compounds were determined using a combination of transmission electron microscopy and X-ray and neutron powder diffraction (S.G. Ammm, a= 5.74313(7), b= 3.98402(4), c= 26.83780(4) angstrom, R-I= 0.035, R-P = 0.042 for Pb2.9Ba2.1Fe4TiO13 and S.G. Imma, a = 5.7199(1), b = 3.97066(7), c = 32.5245(8) angstrom, R-I = 0.032, R-P = 0.037 for Pb3.813i0,2Ba2Fe4,2Ti1.8016). The crystal structures of the A(n)B(n)O(3n-2) homologues are formed by slicing the perovskite structure with (101)p crystallographic shear (CS) planes. The shear planes remove a layer of oxygen atoms and displace the perovskite blocks with respect to each other by the 1/2[110](p) vector. The CS planes introduce edgesharing connections of the transition metal oxygen polyhedra at the interface between the perovskite blocks. This results in intrinsically frustrated magnetic couplings between the perovskite blocks due to a competition of the exchange interactions between the edge- and the corner-sharing metal oxygen polyhedra. Despite the magnetic frustration, neutron powder diffraction and Mossbauer spectroscopy reveal that Pb2.9Ba2.1Fe4TiO13 and Pb3.8Bi0.2Ba2Fe4.2Ti1.8O16 are antiferromagnetically ordered below TN = 407 and 343 K, respectively. The Pb2.9Ba2.1Fe4TiO13 and Pb3.8Bi0.2Ba2Fe4.2Ti1.8O16 compounds are in a paraelectric state in the 5-300 K temperature range.

引用

页码：9508 / 9516

页数：9

共 29 条

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