@article { coopanrai2013, author = "Coondoo, Indrani and Panwar, Neeraj and Rai, Radheshyam and Amorin, Harvey and Kholkin, Andrei L.", title = "Synthesis and physical properties of Ca- and Ta-modified (K,Na)NbO3 lead-free piezoelectric ceramics", year = "2013" }