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Polarized Raman spectra have been obtained on
oriented single crystals of Ag8W40l6 from 293 K
to the melting point (893 K) and also of the melt,
both in air in an oxygen atmosphere. The temperature
dependences of the low-frequency Ag+-ion vibrations
show no anomalies, in contrast to those in solid
electrolytes such as -AgI. Polarization versus
temperature measurements have been made on the
crystals under the same conditions as the Raman
measurements. The results indicate that there is
decomposition of the crystals in air which produces
conducting phase irreversibly. The oxygen atmosphere
impedes this decomposition and the (W40l6)8- ions
continue to be noncentrosymmetric in the
melt. Results of measurements of electrical
conductivity of single crystals of Ag26I18W40l6 in
the emperature range 473-175 K show existence of two
first order transitions at 246 and 197 K; At 298 K
the average conductivity, 0.0825 ( cm)-l,is 1.4
times the best value obtained from conductivity
measurements on po1ycrystalline material.
oriented single crystals of Ag8W40l6 from 293 K
to the melting point (893 K) and also of the melt,
both in air in an oxygen atmosphere. The temperature
dependences of the low-frequency Ag+-ion vibrations
show no anomalies, in contrast to those in solid
electrolytes such as -AgI. Polarization versus
temperature measurements have been made on the
crystals under the same conditions as the Raman
measurements. The results indicate that there is
decomposition of the crystals in air which produces
conducting phase irreversibly. The oxygen atmosphere
impedes this decomposition and the (W40l6)8- ions
continue to be noncentrosymmetric in the
melt. Results of measurements of electrical
conductivity of single crystals of Ag26I18W40l6 in
the emperature range 473-175 K show existence of two
first order transitions at 246 and 197 K; At 298 K
the average conductivity, 0.0825 ( cm)-l,is 1.4
times the best value obtained from conductivity
measurements on po1ycrystalline material.