TY - BOOK AU - Ansari Azaj Au. AU - Sreenivas K. Gu. AU - University of Delhi. Faculty of Sciences. Department of Physics & Astrophysics ED - University of Delhi. Faculty of Sciences. Department of Physics & Astrophysics TI - Polymorphic phase boundaries and light upconversion effects in Er3+ and Sn4+ modified BaTiO3 ceramics PY - 2021/// KW - Physics ER -