Lattice dynamics is also one of the important aspects in such studies, because it has been suggested that soft
phonon mode mechanism is the major cause of zirconia phase transformations [13]. One of the important issues is
that the density function theory calculation is performed in the conditions which temperature is 0 K. However, at 0
K, most phases could not be stable without any external pressure or internal dopants. The issue produces challenges
when comparing DFT computational results with experimental data. Therefore, a study of pressure-dependent
lattice dynamic study is necessary. Ozturk and Durandurdu [14] conducted a comprehensively theoretical study on
pressure based phase transition of zirconia. Victor et al [15] used CASTEP code to develop an ab initio model of
tetragonal zirconia with external pressure. They found that the lattice structure of t-ZrO2 will change to cubic
structure under the pressure of 37GPa. Structural properties of zirconia, such as band structure and density of state,
were also investigated by DFT calculations [11, 16].
Lattice dynamics is also one of the important aspects in such studies, because it has been suggested that softphonon mode mechanism is the major cause of zirconia phase transformations [13]. One of the important issues isthat the density function theory calculation is performed in the conditions which temperature is 0 K. However, at 0K, most phases could not be stable without any external pressure or internal dopants. The issue produces challengeswhen comparing DFT computational results with experimental data. Therefore, a study of pressure-dependentlattice dynamic study is necessary. Ozturk and Durandurdu [14] conducted a comprehensively theoretical study onpressure based phase transition of zirconia. Victor et al [15] used CASTEP code to develop an ab initio model oftetragonal zirconia with external pressure. They found that the lattice structure of t-ZrO2 will change to cubicstructure under the pressure of 37GPa. Structural properties of zirconia, such as band structure and density of state,were also investigated by DFT calculations [11, 16].
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