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The impedance spectra of KNbO3 under different pressure. Inset: the enlargement of impedance at 8.1, 13.8, and 23.4 GPa.
The pressure dependence of resistance, relaxation frequency, and relative permittivity of KNbO3. O denotes orthorhombic; T, tetragonal; and C, cubic. Vertical dotted lines indicate transition pressures.
The band structure of (a) the orthorhombic phase at 4 GPa and (b) the tetragonal phase at 10 GPa, (c) the cubic phase at 15 GPa. (d) The pressure dependence of energy bandgap in three phases.
Calculated partial DOS for the orthorhombic phase (1, 7 GPa), the tetragonal phase (9, 13 GPa), and the cubic phase (15, 30 GPa), respectively.
Calculated difference charge density maps in the (001) plane through the Nb and O atoms with an isosurface value of 0.27 for the orthorhombic phase (1, 7 GPa), the tetragonal phase (9, 13 GPa), and the cubic phase (15, 30 GPa), respectively.
The pressure dependence of Eg and lnR for three phases of KNbO3.
The pressure dependence of activation energy.
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