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Preparation, Structural and Magnetic Properties of Ordered Perovskite (BaLa)(MgMo)O$_6$

  • Choy Jin-Ho (Department of Chemistry, Seoul National University) ;
  • Hong Seung-Tae (Department of Chemistry, Seoul National University)
  • 발행 : 19890200

초록

The polycrystalline powder of (BaLa)(MgMo)$O_6$ has been prepared at $1350^{\circ}C$ in a nitrogen flowing atmosphere. The powder X-ray diffraction pattern indicates that (BaLa)(MgMo)$O_6$ has a cubic perovskite structure ($a_0$ = 8.019(3) $\AA)$ with 1:1 ordering or $Mg^{2+}$ and $Mo^{5+}$ in the oxide lattice. The infrared spectrum shows two strong absorption bands with their maxima at 600(${\nu}3$) and 365(${\nu}4$) cm-1, which are attributed to $2T_{1U}$, modes of molybdenum octahedra MoO6 in the crystal lattice. According to the magnetic susceptibility measurement, the compound shows a paramagnetic behavior which follows the Curie-Weiss law below room temperature with the effective magnetic moment 1.60(1){$\mu}B$, which is consistent with that of spin only value ($1.73{\mu}B$) for $Mo^{5+}$ ($4d^1$ electronic configuration). From the thermogravimetric and X-ray diffraction analyses, it has been found that (BaLa)(MgMo)$O_6$ decomposes gradually into $BaMoO_4$, $MoO_3$ and unidentified phases above $900^{\circ}C$ in an ambient atmosphere, absorbing about 0.25 mole $O_2$ per mole of Mo ion, which also supports that oxidation state of $Mo^{5+}$ in the (BaLa)(MgMo)$O_6$.

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참고문헌

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피인용 문헌

  1. ChemInform Abstract: Preparation, Structural, and Magnetic Properties of Ordered Perovskite (BaLa)(MgMo)O6. vol.20, pp.27, 1989, https://doi.org/10.1002/chin.198927009
  2. Structural study and magnetic measurements of some perovskites MLnLiTeO6 vol.63, pp.None, 1989, https://doi.org/10.1016/0167-2738(93)90165-y