X-band microwave permittivity measurements on lithium and cesium salts of 12-tunstophosphoric acid
Davidović, Milorad P.
MetadataShow full item record
Complex permittivity measurements have been performed on lithium and cesium salts of 12-tungstophosphoric acid hydrates (H3PW12O40.nH(2)O) within the frequency region of the microwave X-band (8 - 12 GHz) and at room temperature. Dielectric relaxation spectra have been observed for both salts. For the lithium salt (Li3PW12O40.11H(2)O) one dipolar relaxation has been recorded, whereas for the cesium salt (CS3PW12O40.10H(2)O) two dipolar relaxations have been registered. The results are discussed by assuming that the fast reorientation of H2O molecules and oxonium ions (H3O+) contribute to the observed relaxations. Dynamical conductivity results exhibit frequency dependence with a waviness reflecting the observed dipolar relaxations.
Keywords:superionic proton conductors / heteropolyacids salts / microwave permittivity / dielectric relaxations
Source:Materials Science Forum, 1998, 282-2, 193-197
- Advanced Materials and Processes, 2nd Yugoslav Conference on Advanced Materials (YUGOMAT II), Sep 15-19, 1997, Herceg Novi, Yugoslavia