Dielectric and ferroelectric properties of stoichiometric and A - site substituted BaBi4-xMxTi4O15(M=La,Sm) ceramics - Anita Au.; University of Delhi. Faculty of Science. Department of Physics and Astrophysics; Prof. K. Sreenivas Gu.; University of Delhi. Faculty of Science. Department of Physics and Astrophysics (2015)