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Raman study of the Ag8W40l6 in the superionic system AgI + Ag8W40l6


Turković, Aleksandra
Raman study of the Ag8W40l6 in the superionic system AgI + Ag8W40l6, Saarbrücken: VDM Verlag Dr. Müller AG & Co. KG, 2009 (monografija)


Naslov
Raman study of the Ag8W40l6 in the superionic system AgI + Ag8W40l6

Autori
Turković, Aleksandra

Vrsta, podvrsta i kategorija knjige
Autorske knjige, monografija, znanstvena

Izdavač
VDM Verlag Dr. Müller AG & Co. KG

Grad
Saarbrücken

Godina
2009

Stranica
172

ISBN
978-3836475419

Ključne riječi
Raman; superionic conductor; impedance spectroscopy

Sažetak
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 a-AgI. Polarization versus temperature measure- ments 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 results in this case confirm an earlier prediction that there is no crystallographic transformation of the crystals up to the melting point and that the (W40l6)8- ions continue to be noncentrosymmetric in the melt. Results of measurements of electrical conductivity of single crystals of Ag26I18W40l6 in the temperature range 473-175 K show existence of two first order transitions at 246 and 197 K ; the phases are labeled α , β , γ in order of decreasing temperature. At 298 K the average conductivity, 0.0825 (Ω cm)-l, is 1.4 times the best value obtained from conductivity measurements on polycrystalline material. From the log (σ T) vs. T-l data for the a phase the activation energies of motion are of magnitude 10-1 eV as for other solid electrolytes. The magnitudes of the activation energies of motion of the β and γ phases appear to be constant, and suggest that there is greater order in the lower phases (β and γ ) than in the α phase.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
098-0982886-2859 - Sinergija nanofaza i nanokompozita (Maja Buljan, )

Ustanove
Institut "Ruđer Bošković", Zagreb

Profili:

Avatar Url Aleksandra Turković (autor)

Citiraj ovu publikaciju

Turković, Aleksandra
Raman study of the Ag8W40l6 in the superionic system AgI + Ag8W40l6, Saarbrücken: VDM Verlag Dr. Müller AG & Co. KG, 2009 (monografija)
Turković, A. (2009) Raman study of the Ag8W40l6 in the superionic system AgI + Ag8W40l6. Saarbrücken, VDM Verlag Dr. Müller AG & Co. KG.
@book{book, author = {Turkovi\'{c}, A.}, year = {2009}, pages = {172}, keywords = {Raman, superionic conductor, impedance spectroscopy}, isbn = {978-3836475419}, title = {Raman study of the Ag8W40l6 in the superionic system AgI + Ag8W40l6}, keyword = {Raman, superionic conductor, impedance spectroscopy}, publisher = {VDM Verlag Dr. M\"{u}ller AG and Co. KG}, publisherplace = {Saarbr\"{u}cken} }