Comment on “Structural, electrical, and multiferroic characteristics of lead-free multiferroic: Bi(Co<sub>0.5</sub>Ti<sub>0.5</sub>)O<sub>3</sub>–BiFeO<sub>3</sub> solid solution” by N. Kumar, A. Shukla, N. Kumar, R. Choudhary and A. Kumar, <i>RSC Adv.</i>, 2018, <b>8</b>, 36939”
