Microwave characterization of Pb1−xCaxFe0.5Nb0.5O3 multiferroics at X-bandTanvi Dhiman, Charanjeet Singh, Maalti Puri, Harpreet Kaur, Randeep Kaur and S. Bindra NarangEur. Phys. J. B, 88 10 (2015) 271DOI: https://doi.org/10.1140/epjb/e2015-60527-1