MÖSSBAUER STUDY OF THE STATE OF IMPURITY ATOMS IN TiO2 - AND BaTiO2 -BASED INSULATING AND SEMICONDUCTIVE CERAMICS V.K. Yarmarkin, S.P. Teslenko, A.V. Motorny et A.A. Shustrov J. Phys. Colloques, 40 C2 (1979) C2-375-C2-377 DOI: 10.1051/jphyscol:19792132