abstract
A single perovskite phase formation of polycrystalline samples of (Na(0.52)K(0.44)Li(0.04)) (Nb(0.86-x) Ta(0.1)Sb(0.04)Mn(x)) (where x = 0.00, 0.01, 0.03, and 0.05) here by denoted as NKNLST and Mn doped NKNLST were prepared by mixed oxide method. The preliminary structural studies were carried out by x-ray diffraction technique showing the formation of single perovskite phase with orthorhombic symmetry for all compositions. Addition of Mn in NKNLST system lowered the sintering temperature by 75 degrees C. Detail study of impedance parameters shows the non-Debye temperature of relaxation phenomena in the system. This analysis enables us to separate grain and grain boundary contribution of the materials. Above the ferroelectric-paraelectric phase transition temperature, the electrical conduction is governed by the thermal excitation of carriers from oxygen vacancies exhibiting Negative temperature coefficient (NTCR) behaviour. (C) 2011 American Institute of Physics. [doi:10.1063/1.3660267]
keywords
LEAD-FREE CERAMICS; PIEZOELECTRIC PROPERTIES; CONDUCTIVITY; TEMPERATURE; RELAXATION; BEHAVIOR; RANGE; NA
subject category
Physics
authors
Rani, R; Sharma, S; Rai, R; Kholkin, AL
our authors
Andrei Kholkin
Principal Researcher
Radheshyam Rai
Post-doc Fellowshipacknowledgements
This work was supported by the Department of Science and Technology, Govt. of India (SR/S2/CMP-39/2006) and Foundation for Science and Technology of Portugal (FCT) for financial support (grant SFRH/BPD/38001/2007).