Electron-Spin Resonance Studies of Crystal Field Parameters in Mn2+: LiNbO3

Abstract

ESR studies were performed on a single crystal of ferroelectric LiNbO3 doped with manganese. Mn2+ in an axially symmetric site is described by the spin Hamiltonian [H=gβ H·S+B20D20+B40040+B43043+(B43043)*+AS·I]. Values for B43(B43=0, B43I=17 G) reported here, have not been reported previously. By examining the temperature dependence of B43 and B40 a value for the fractional change in the optical parameter Dq[(1/Dq)(∂Dq/∂T)=−3.5 × 10−3 °C−1] has been calculated. A discussion of the temperature dependence of B20 is also given.

EPR Study of Low Symmetry Mn2+ Centers in LiNbO3. Superposition Model and Crystal Field Analysis of the Zero‐Field Splitting Parameters

“…5 0) -(0.029345 -i0.001491) ("P -1.5 -1) (0.006104 -i0.000414) ("G -1.5 -4) -(0.006205 -i0.000315) ("G -1.5 -1) -(0.008012 -i0.000271) ("G -1. 5 2)…”

“…In practice, since D ( = b; = 3B;) is the major parameter which determines the two ZF transitions in (5), Z F splittings can be roughly estimated as 2 0 and 4 0 for 3d5 ions (see, e.g., [28,32,351). …”

Study of the Solid Solutions of LiNbO3and LiTaO3with Mn2+

“…Another application of solid solutions of LiNbO and LiTaO that contain Eu> is light-converted materials (19)(20)(21)(22)(23)(24). Although some authors have described the optical properties of a single crystal of LiNbO with Mn> (25)(26)(27)(28)(29)(30)(31)(32)(33)(34), no one has reported crystallochemical studies of LiNbO and LiTaO solid solutions with Mn>. Even though our crystallochemical data were in complete agreement with a divalent valence for manganese when it is incorporated into the lattices of LiNbO and the LiTaO , X-ray photoelectron spectroscopy (XPS) was used to confirm this oxidation state, since this technique has proved to be a very powerful tool for the study of molecular bonding (35,36).…”

Temperature Dependence of Mn2+Paramagnetic Ion in a Stoichiometric LiNbO3Single Crystal

“…(1) and (2). The D value was already calculated in many previous papers [30][31][32][33]. Only the variation of D values as a function of temperature for Mn 2+ ion is interested in this study.…”

“…The local site symmetry, the substituted position and ionic state of the optically active ions in LiNbO 3 crystal can be determined by EPR techniques [28]. A number of NMR [29] and EPR [30][31][32][33] …”