posted on 2012-08-23, 00:00authored byJolanta Darul, Waldemar Nowicki, Paweł Piszora
Lithium-rich spinel oxide has been synthesized in a long-term
low
temperature sintering process via the intermediate defected phase.
Synchrotron X-ray diffraction studies under pressure have been performed
on Li4Mn5O12, and some similarity
of its behavior under compression to that of LiMn2O4 has been demonstrated. Li4Mn5O12 reveals a bulk modulus value of K0 = 118(1) GPa, and K0′ = 4.5(3)
GPa. This value is far below 200 GPa, which is typical of most spinel
oxides. The local compressibility of LiO4 tetrahedra is
responsible for these unusual elastic properties of lithium–manganese
spinel oxides both with Mn4+ only and Mn3+/Mn4+ ions in octahedral sites.