title: High-temperature phase transition studies in a novel fast ion conductor, Na2Cd(SO4)2, probed by Raman spectroscopy.
abstract: Temperature-dependent Raman spectroscopic studies were carried out on Na(2)Cd(SO(4))(2) from room temperature to 600 degrees C. We observe two transitions at around 280 and 565 degrees C. These transitions are driven by the change in the SO(4) ion. On the basis of these studies, one can explain the changes in the conductivity data observed around 280 and 565 degrees C. At 280 degrees C, spontaneous tilting of the SO(4) ion leads to restriction of Na(+) mobility. Above 565 degrees C, the SO(4) ion starts to rotate freely, leading to increased mobility of Na(+) ion in the channel.
authors.affiliation: Light Scattering Laboratory, Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur P.O., Bangalore 560064, India.
authors.forename: Gopal K
authors.initials: GK
authors.lastname: Pradhan
authors.forename: Diptikanta
authors.initials: D
authors.lastname: Swain
authors.forename: Tayur N
authors.initials: TN
authors.lastname: Guru Row
authors.forename: Chandrabhas
authors.initials: C
authors.lastname: Narayana