Capacitance-vs-voltage and frequency characteristics of SnO2-Co3O4-Nb2O5-Cr2O3 ceramics A. N. Bondarchuk, A. B. Glot, S. V. Mazurik, M. Marquez Miranda and G. Jimenez-Santana Eur. Phys. J. Appl. Phys., 48 3 (2009) 30302 Published online: 30 October 2009 DOI: 10.1051/epjap/2009173