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Influence of Simultaneous Doping of Li^+ and Fe^{3+} Ions in the LiMn_2O_4 Spinel Structure

100%
Nowicki W.
Acta Physica Polonica A
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2008
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vol. 114
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issue 2
375-382
EN
A series of compounds Li_xMn_{3-x-y}Fe_yO_4 (x=1.0125;0≤y≤0.05) were synthesized by solid state reaction of Li_2CO_3 with the manganese oxide or iron-manganese oxide precursors. Investigations of the structure transformation effect of double substitution with Li^+ and Fe^{3+} ions in LiMn_2O_4, in the temperature range of 10-300 K, were undertaken using high-resolution X-ray powder diffraction at the HASYLAB (DESY) synchrotron. The Li_{1.0125}Mn_{1.9625}Fe_{0.025}O_4 transforms from cubic (Fd3̅ m) to orthorhombic (Fddd) below 250 K, and is stable to 10 K. Whereas in the Li_{1.0125}Mn_{1.9375}Fe_{0.05}O_4 oxide no phase transition was observed, this spinel remains in cubic structure down to the temperature of 10 K.
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Some peculiarities in stability of nanodispersions

100%
Nowicki W.
|
2008
|
vol. 63
169-179
EN
The stability of some classes of dispersion systems, extensively studied in modern material sciences and nanotechnology, is discussed in terms of the classical colloid chemistry laws. Some limitations of the technologies resulting from the specificity of the nanodispersed systems, utilized in nowadays applications, are pointed out.
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