Electrical resistivity of nano-crystalline and natural MgTiO3−geikielite at high-pressures up to 8 GPa

We report here for the first time the pressure dependence of the electrical resistivity of nano-crystalline and natural MgTiO₃-geikielite up to 8 GPa, at room temperature. The electrical resistivity of nano-crystalline geikielite decreases from 2.246 × 10⁸ Ω m at room pressure to 2.0 × 10⁶ Ω m at 7.8 GPa, whereas the electrical resistivity of natural geikielite decreases from 1.098 × 10⁸ Ω m at room pressure to 1.74 × 10⁵ Ω m at 7.8 GPa, indicating more compressibility of natural geikielite in the pressure range of investigations. The present study shows that geikielite does not undergo any pressure-induced phase transition up to 7.8 GPa, indicating its stability in the Earth's mantle pressure conditions.