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2 International Letters of Chemistry, Physics and Astronomy

2 2015

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Semiconductor MgTiO3, MgTi2O5 &enspand Mg2TiO4 &ensp double-oxide electrodes for dye-sensitized solar cells

Ishii N., Okamoto Y., Suzuki Y.

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 46

9--15

MgTiO3, MgTi2O5&ensp and Mg2TiO4 &ensp were examined as DSC electrodes to improve photoelectric conversion efficiency. MgCO3 &ensp(basic) and &enspTiO2&ensp powders (nominally, Mg:Ti = 1:1, 1:2 and 2:1 in mole fraction) were wet-ball milled in ethanol for 24 h. The mixed powders were calcined in air at 1100 °C for 2 h to obtain the MgTiO3&enspand MgTi2O5&ensp powders, and at 1300 °C for 2 h to obtain the Mg2TiO4 &ensp powder. Single-phase MgTiO3, MgTi2O5&ensp and Mg2TiO4 &ensp powders were successfully synthesized. Although the DSC performance was not as high as expected, all samples were functioned as DSC.

Morphology control of pseudobrookite-type MgTi2O5&ensppowders by LiF doping

Nakagoshi Y., Suzuki Y.

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 46

37--41

Well-controlled fine MgTi2O5 &ensppowders, with pseudobrookite-type structure, are desired toward various industrial applications, however, commercial powders are hardly available to date. In this study, we focused the processing and characterization of well-controlled MgTi22O5 &ensppowders with/without LiF additive. MgCO3 &ensp(basic) and TiO2&ensp anatase powders with/without 0.5 wt. % LiF additive were calcined in air at 1100 °C for 2 h to obtain the MgTi2O5 &ensppowders. SEM observation revealed that the non-doped MgTi2O5 &ensppowder consisted of equiaxed particles with the diameter of 0.51.5 μm, whereas, the LiF-doped MgTi2O5 &ensppowder consisted of elongated particles with the length of ~ 5-10 μm and the diameter of ~1.0-1.5 μm. The smooth surface of elongated MgTi2O5 &enspparticles demonstrates the effect of LiF doping as a flux, i.e., liquid phase formation during the reaction.