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High-pressure electrical transport properties of KNbO3: Experimental and theoretical approaches
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10.1063/1.4706255
/content/aip/journal/apl/100/17/10.1063/1.4706255
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/17/10.1063/1.4706255

Figures

Image of FIG. 1.
FIG. 1.

The impedance spectra of KNbO3 under different pressure. Inset: the enlargement of impedance at 8.1, 13.8, and 23.4 GPa.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Calculated partial DOS for the orthorhombic phase (1, 7 GPa), the tetragonal phase (9, 13 GPa), and the cubic phase (15, 30 GPa), respectively.

Image of FIG. 5.
FIG. 5.

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.

Tables

Generic image for table
Table I.

The pressure dependence of Eg and lnR for three phases of KNbO3.

Generic image for table
Table II.

The pressure dependence of activation energy.

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/content/aip/journal/apl/100/17/10.1063/1.4706255
2012-04-25
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-pressure electrical transport properties of KNbO3: Experimental and theoretical approaches
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/17/10.1063/1.4706255
10.1063/1.4706255
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