Z. Naturforsch. 2014,
69b, 141 – 149
doi:10.5560/ZNB.2014-3259
Optical Spectroscopy and Crystal Field Studies of the Mn4+ Ion (3d3) in the Double Perovskite NaLaMgTeO6
Alok M.
Srivastava1,
Mikhail G.
Brik2,
Samuel J.
Camardello1,
Holly A.
Comanzo1, and
Florencio
Garcia-Santamaria1
1 GE Global Research, One Research Circle, Niskayuna, New York 12309, USA
2 Institute of Physics, University of Tartu, Riia 142, Tartu 51014, Estonia
Received August 21, 2013 / published online February 17, 2014
The spectroscopic properties of the Mn4+ ion (3d3) in the double perovskite NaLaMgTeO6 are reported in this work. Evidence is presented for the occupation by the Mn4+ ion of both the six coordinated Mg2+ and Te6+ sites in the host structure. The Mn4+ energy levels are calculated using the exchange charge model of crystal field theory for both occupied sites. The results of our calculations yield the crystal field splitting and Racah parameters of Dq =2008 cm−1, B =790 cm−1, C =2881 cm−1, with C/B = 3.65 (Mg2+ site) and
Dq =2008 cm−1, B =790 cm−1, C =2949 cm−1, with C/B = 3.73 (Te6+ site). A cross-cutting comparative study of the variations in the crystal field splitting and the Racah parameters of the six-coordinated Mn4+ ion in a series of materials with the perovskite structure are presented.
Key words: Mn4+ Ion, Crystal Field Splitting, Perovskites, Optical Materials