Structural and magnetic properties of Ba{sub 3}La{sub 3}Mn{sub 2}W{sub 3}O{sub 18}

Journal Article · Sat Jan 15 00:00:00 EST 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.11.007· OSTI ID:20721674

Zhaofei, Li ^[1]; Junliang, Sun ^[1]; Yingxia, Wang ^[1]; Liping, You ^[2]; Jianhua, Lin ^[1]

---

1. State Key Laboratory of Rare Earth Materials Chemistry and Applications, Department of Material Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (China)
2. Electron Microscopy Laboratory, College of Physics, Peking University, Beijing 100871 (China)

A quaternary phase, Ba{sub 3}La{sub 3}Mn{sub 2}W{sub 3}O{sub 18}, was synthesized in reduced atmosphere (5% H{sub 2}/Ar) at 1200 deg. C and characterized by using powder X-ray diffraction, electron diffraction and high resolution TEM. Ba{sub 3}La{sub 3}Mn{sub 2}W{sub 3}O{sub 18} crystallizes in rhombohedral space group R3-bar m with the cell parameters, a=5.7371(1)A and c=41.8336(5)A, and can be attributed to the n=6 member in the B-site deficient perovskite family, A{sub n}B{sub n-1}O{sub 3n}. The structure can be described as close-packed [La/BaO{sub 3}] arrays in the sequence of (hcccch){sub 3}, wherein the B-site cations, W and Mn, occupy five octahedral layers in every six octahedral layers, which leave a vacant octahedral layers separating the 5-layer perovskite blocks. The B-cation layers in the perovskite block alternate along the c-axis in a sequence of W{sup 6+}-Mn{sup 2+}-W{sup 5+}-Mn{sup 2+}-W{sup 6+}. The bond valence calculation and optical reflection spectrum confirm the presence of W{sup 5+}. This compound behaves paramagnetically in wide temperature range and weak antiferromagnetic interaction only occurs at low temperatures.

• OSTI ID: 20721674
• Journal Information: Journal of Solid State Chemistry, Vol. 178, Issue 1; Other Information: DOI: 10.1016/j.jssc.2004.11.007; PII: S0022-4596(04)00606-1; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
CUBIC LATTICES
ELECTRON DIFFRACTION
LANTHANUM COMPOUNDS
LAYERS
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
MANGANESE IONS
OXIDES
PEROVSKITE
SPACE GROUPS
TRANSMISSION ELECTRON MICROSCOPY
TRIGONAL LATTICES
TUNGSTEN COMPOUNDS
TUNGSTEN IONS
X-RAY DIFFRACTION