Electrical switching and spectroscopic studies of silver-vanado-phosphate glasses
- 97 Downloads
High field electrical switching studies on x Ag2O − (50−x) P2O5 −50V2O5 glasses have been carried out as a function of sample thickness, composition and temperature. The I–V characteristic show that switching in these glasses is memory type. The switch voltages are found to decrease with increase of temperature, on the other hand, the voltages increase with the thickness of the sample. The experimental findings clearly reveal that switching in these glasses is a thermally assisted bulk effect. The results obtained are explained on the basis of formation of crystalline conducting channels. Another notable observation is that the glass with 15 mol% Ag2O concentration only exhibits the switching property at room temperature. This aspect is examined in view of various structural groups present in these glasses with the help of spectroscopic studies; IR and MAS–NMR measurements have been carried out. IR studies of these glasses show characteristic absorption peaks corresponding phosphate and vanadium vibrations in the network. 31P MAS–NMR chemical shift show presence of [POO3/2]0 and [POO2/2O]− groups.
KeywordsAg2O Switching Behavior Vanadium Pentoxide Switching Voltage Memory Type
One of the authors (R.V.A) would like to thank the UGC, New Delhi, for financial assistance to carryout this work.
- 2.Kolomiets BT, Lrbedev EA, Takasami IA (1969) Sov Phys Semicond 3:267Google Scholar
- 7.Tatsmisago M, Shinkuma Y, Minami T (1991) Nature 354:271Google Scholar
- 10.Sanderson RT (1983) Polar covalence. Academic press, NewYorkGoogle Scholar
- 11.Farouk H, Ezz Eldin FM, Farhan H, El -Batal HA, Kashif I (1994) J Phys Chem Glasses 35(5):207Google Scholar
- 12.Rao KJ, Sobha KC, Sundeep Kumar (2001) Proc Indian Acad Sci (Chem Sci) 113(5 & 6):497Google Scholar
- 15.Arujo EB, Eiras JA, Delmedia EF, de-Paiva JAC, Somra SB (1999) Phys Chem Glasses 40(5) 273Google Scholar
- 17.Anderson GW, Compton WD (1970) J Chem Phys 52:1691Google Scholar
- 18.Kulieva SA, Rza-zade PF, Gnaf KL, Luzhnaga NP (1974) Inorg Mater Sci (USA) 10:550Google Scholar