Microwave characterization of Pb1−xCaxFe0.5Nb0.5O3 multiferroics at X-band Tanvi Dhiman, Charanjeet Singh, Maalti Puri, Harpreet Kaur, Randeep Kaur and S. Bindra Narang Eur. Phys. J. B, 88 10 (2015) 271 Published online: 21 October 2015 DOI: 10.1140/epjb/e2015-60527-1