Analysis on the local structures for 3d1 impurities (Ti3+ and V4+) in KTiPO4

Ding, C. C.; Wu, S. Y.; Zhang, L. J.; Xu, Y. Q.; Zhang, Z. H.; Wu, M. H.; Teng, B. H.
January 2018
Magnetic Resonance in Chemistry;Jan2018, Vol. 56 Issue 1, p25
Academic Journal
Making use of the perturbation formulae for 3d1 ions (Ti3+ and V4+) under orthorhombically compressed octahedra, the spin Hamiltonian parameters (g factors: gx, gy, gz and hyperfine structure constants: Ax, Ay, Az) and local structures of the 3d1 impurity centres C1, C2, and C3 in KTiOPO4 crystals are theoretically analyzed in a consistent way. The remarkable local distortions (i.e., the relative axial compression ratios 11.2%, 7.0%, and 5.5% along Z axis and the relative planar bond length variation ratios 15.9%, 7.0%, and 6.0%) are obtained for the [Ti2O6]9− cluster on Ti2 site and [VO6]8− clusters on Ti1 and Ti2 sites, respectively, in view of the Jahn-Teller effect. The above local orthorhombic distortion parameters in the impurity centres are found to be more significant than the host Ti1 and Ti2 sites in pure KTiOPO4. The sequences (C1 > C2 > C3) of the local orthorhombic distortion parameters ρ and τ are in accordance with those of the axial and perpendicular anisotropies Δg and δg of g factors, respectively.


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