Naslov
High Temperature Raman Spectroscopy of Silver Tetratungstate Ag8W4O16

Autori
Turković, Aleksandra ; Fox, David Lee ; Scott, James F. ; Geller, Seymour ; Ruse, Gay F.

Izvornik
Materials research bulletin (0025-5408) 12 (1977), 2; 189-196

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Raman spectroscopy ; single crystal ; Ag8W4O16

Sažetak
Polarized Raman spectra have been obtained on oriented single crystals of Ag2W4O16 from 20oC to the melting point 620oC and also of the melt, both in air and in an oxygen atmosphere. The temperature dependences of the low-frequency Ag+-ion vibrations show no anomalies, in contrast to those in ionic conductors such as alpha-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 irreversible conducting phases. The oxygen atmosphere impedes this decomposition, and the results in this case confirm an earlier prediction that there is no crystallographic transformation of the crystalup to the melting point and that the (W4O16)8- ions continue to be noncentrosymmetric in the melt-

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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