1. Grupo de Pesquisa em Química Inorgânica Teórica, Departamento de Química-ICEx- Universidade Federal de Minas Gerais, 31.270-901 Belo Horizonte, MG, Brazil
2. Department of Physical Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany
3. Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Science, 620219 Ekaterinburg, Russian Federation