Can I read Stability of LiMn2O4 and new high temperature phases in air, O2 and N2 on EtoBox?

Stability of LiMn2O4 and new high temperature phases in air, O2 and N2 by Vincenzo Massarotti; Doretta Capsoni; Marcella Bini is a Physics and Astronomy article available to read on EtoBox.

What is Stability of LiMn2O4 and new high temperature phases in air, O2 and N2 about?

We investigate the reversible and irreversible transformations, the Li, Mn spinel undergoes under different atmospheres (air, O 2 , and N 2 ) when heated up to 1050 8C. In air and O 2 , a substantial reversible cation exchange occurs. For T $ 800 8C, Mn 2þ ions substitute Li þ at the tetrahedral (8a) position, and Li þ shifts to interstitial octahedral (16c) site. Charge balance is achieved by a decrease in the Mn 3þ fraction, which is partially reduced to Mn 2þ in the regular octahedral (16d) site, according to the charge distribution (Li 122y þ Mn 2y 2þ ) 8a [Li 3y þ ] 16c [Mn 5y 2þ Mn 125y 3þ Mn 1 4þ ] 16d O 4 (y increases with T ). Under N 2 flow, a first decomposition occurs between 600 and 800 8C and yields Mn 3 O 4 , orthorhombic LiMnO 2 and O 2 . A minor O 2 release occurs when heating above 900 8C, which is accompanied by the transformation of o-LiMnO 2 into a cubic Li x Mn 12x O solid solution ðx # 0:5Þ; consistent with a decrease in the average oxidation state of Mn ions. This cubic phase is stable at high temperature and decomposes upon cooling ðT # 800 8CÞ leaving just the Mn 3 O 4 and o-LiMnO 2 phases.

Who reads Stability of LiMn2O4 and new high temperature phases in air, O2 and N2?

Author

Vincenzo Massarotti; Doretta Capsoni; Marcella Bini

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0038-1098)

Published

2002

Language

EN

Field

Physics and Astronomy (Physical Sciences)