A new manganese ortho-arsenate. The synthesis, structure and magnetic properties of Ba2Mn(AsO4)(2)

被引：4

作者：

Adams, RD ^{[1
]}

Layland, R ^{[1
]}

Payen, C ^{[1
]}

机构：

[1] INST MAT NANTES,F-44072 NANTES,FRANCE

来源：

POLYHEDRON | 1996年 / 15卷 / 08期

关键词：

D O I：

10.1016/0277-5387(95)00383-5

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The new compound Ba2Mn(AsO4)(2) (1) was obtained by heating a mixture of BaCO3, MnO2 and As2O5 in air to 1020 degrees C for 48 h. The manganese ion occupies a distorted octahedral site produced by six oxygen atoms from neighbouring AsO4 groups. Five of the Mn-O contacts are short, Mn-O = 2.11(1)-2.18(1)Angstrom and one is long Mn-O = 2.56(2)Angstrom. The barium ions occupy channels that run parallel to the a-axis of the crystal. Each MnO, octahedron is linked to five nearest neighbours via O-As-O bridging units. Magnetic measurements at room temperature show an effective magnetic moment, mu(eff) = 6.05 B.M., which is consistent with a high-spin Mn2+ ion with five unpaired electrons. The temperature-dependent magnetic measurements show that 1 obeys the modified Curie-Weiss law, C = 4.58 emu K/mol, with a weak antiferromagnetic coupling between the ions as indicated by the Weiss constant, theta(p) = -11 K.

引用

页码：1235 / 1239

页数：5

共 49 条

[1] NEW MANGANESE PYROPHOSPHATES - THE SYNTHESES, CRYSTALLOGRAPHIC CHARACTERIZATIONS AND MAGNETIC-PROPERTIES OF BAMNP2O7 AND CAMNP2O7 [J].