Abstract
A quaternary phase, Ba 3La 3Mn 2W 3O 18, was synthesized in reduced atmosphere (5% H 2/Ar) at 1200 °C and characterized by using powder X-ray diffraction, electron diffraction and high resolution TEM. Ba 3La 3Mn 2W 3O 18 crystallizes in rhombohedral space group R 3 ¯ m with the cell parameters, a = 5.7371 ( 1 ) Å and c = 41.8336 ( 5 ) Å , and can be attributed to the n = 6 member in the B-site deficient perovskite family, A nB n −1O 3 n . The structure can be described as close-packed [La/BaO 3] arrays in the sequence of ( hcccch ) 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 6+–Mn 2+–W 5+–Mn 2+–W 6+. The bond valence calculation and optical reflection spectrum confirm the presence of W 5+. This compound behaves paramagnetically in wide temperature range and weak antiferromagnetic interaction only occurs at low temperatures.
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