Thermoelectric and electrical properties of Ba0.5Sr0.5CoxRuxFe(12−2x)O19 ferrite Charanjeet Singh, Maciej Jaroszewski, Sukhleen Bindra Narang and D. Ravinder Eur. Phys. J. B, 89 5 (2016) 110 Published online: 02 May 2016 DOI: 10.1140/epjb/e2016-60471-6