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The spin Hamiltonian parameters (g factors and the hyperfine structure constants) and the local structure for the tetragonal Pt3 + center in BaTiO3 are theoretically investigated from the improved perturbation formulas of these parameters for a 5d7 ion in a tetragonally elongated octahedron. The Jahn-Teller effect yields 0.05Å longer Pt3 + − O2 − bonds along the C4 axis. Under the uniaxial...
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