Crystal Structure and Magnetic Properties of (Mg6−xLix)MnO8

✍ Scribed by Hideki Taguchi; Akiko Ohta; Mahiko Nagao; Hiroyasu Kido; Hisanori Ando; Kenji Tabata

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 237 KB
• Volume: 124
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1996.0229

✦ Synopsis

shows that the sample fired at high temperature is a mixture Murdochite-type (Mg 6؊x Li x )MnO 8 (0.0 Յ Յ Յ x Յ Յ Յ 0.3) was synthe-of Mg 6 MnO 8 and MgO (1, 2). Recently, Taguchi and Nagao sized at 973 K in a flow of pure oxygen gas using a solid state synthesized Mg 6 MnO 8 from the stoichiometric molar ratio reaction. The cell constants, the (Mg, Li)-O(1) distance, and of Mg/Mn by using a sol-gel process (3).

the Mn-O(1) distance monotonously decrease with increasing

Taguchi et al. synthesized (Mg 6Ϫx Al x )MnO 8 (0 Յ x Յ x. The variation of the effective magnetic moment ( eff ) calcu-0.3) at low temperature using the solid state reaction (4). lated from the magnetic measurement indicates that both the (Mg 6Ϫx Al x )MnO 8 has a mixed valence of the Mn 3ϩ and the Mn 4؉ and the Mn 5؉ ions coexist in (Mg 6؊x Li x )MnO 8 (0.0 Յ Յ Յ x Յ Յ Յ Mn 4ϩ ions. The cell constants monotonously decrease with 0.2). The binding energies of the Mg 2s 1/2 , Li 1s 1/2 , Mn 2p 3/2 , increasing x. From the results of the magnetic moment, and O 1s 1/2 levels of (Mg 6؊x Li x )MnO 8 were determined by X-ray both low-spin and high-spin states of the Mn 3ϩ ions coexist.

photoelectron spectroscopy (XPS), and they are independent of the composition.