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More about RAMAN STUDY OF THE Ag8W40l6 IN THE SUPERIONIC SYSTEM AgI + Ag8W40l6

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Book synopsis

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.

Book details

• Full title: RAMAN STUDY OF THE Ag8W40l6 IN THE SUPERIONIC SYSTEM AgI + Ag8W40l6
• Author: Aleksandra Turkovi
• Language: English
• Binding: Paperback
• Number of pages: 172
• EAN: 9783836475419
• ID: 07119715
• Publisher: VDM Verlag Dr. Müller
• Weight: 272 g
• Dimensions: 220 × 150 × 10 mm
• Published: 2009

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