Infrared investigations of some borate glasses

150-153<span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">Infrared spectral investigation of some borate glasses in the frequency range 200-4000 cm-1 has been done. The borate glasses have been prepared by mixing and heat treating ZnO, B2O3 and V2O5. No boroxol ring formation is observed in the structure of these glasses. The absence of 806 cm-1 frequency is attributed to the progressive substitution of boroxol rings by triborate and tetraborate groups. The structure of ZnO-B2O3 glass changes by the addition of V2O5 .In series II and III , the main structure will be due to increase of V2O5content. Similarly formation of Zn in tetrahedral coordination is not observed in ZnO containing glasses.</span

Optical Behaviour of PEO-LiClO4-ZnO Nanocomposite Polymer Electrolyte Films

Abstract- Nanocomposite solid polymer electrolyte films based on Poly (ethylene oxide), (PEO) complexed with lithium perchlorate (LiClO4) and ZnO nanoparticles were prepared for optimized high conducting concentrations of ZnO nanoparticles by sol gel technique. Scanning electron microscopy has been used to study surface morphology. The optical transmission and absorption spectra were recorded in the wavelength range 200-800 nm for optimized high conducting concentrations of ZnO nanoparticles in the polymer matrix. Values of absorption coefficient, direct band gap energy, measure of extent of band trailing or Urbach energy, absorption edge and constant, B, have been investigated by optical characterization method. Effect of concentration of ZnO nanoparticles in the polymer matrix on these parameters has been discussed. It was found that addition of ZnO nanoparticles increases structural disorder and fluctuations of the internal fields associated with it. Small change in the concentration of ZnO nanoparticles changes optical properties of nanocomposite polymer matrix. Index Terms- Absorption coefficient; optical energy gap; optical properties; absorption edge; Urbach energy; bang trailing; nanocomposite polymer matrix. 1

Transport properties of zinc-bismuth oxide glasses

28-32<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Zinc-bismuth oxide glasses of 10-25 mol% of zinc oxide are prepared having thickness between 0.35-0.42 cm and diameter 0.60-0.95 cm. Physical properties such as density (d), molar volume <span style="font-size:11.0pt; line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:minor-fareast;="" mso-hansi-theme-font:minor-latin;mso-bidi-font-family:arial;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa;mso-bidi-font-style:="" italic"="">(V),<span style="font-size:11.0pt;line-height: 115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:minor-fareast;="" mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"=""> hopping distance <span style="font-size:11.0pt;line-height:115%;font-family: " calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa;mso-bidi-font-style:italic"="">(R), number of ions per cc (N) and polaron radius <span style="mso-bidi-font-style: italic">(rp) are also reported. Polaron radius is found around 1.85 <span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-theme-font:minor-latin;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Å<span style="font-size:11.0pt; line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:minor-fareast;="" mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"=""> which shows formation of small polarons. Measurements of de electrical conductivity are reported in the temperature range 443-573K. - Log σ<span style="font-size:11.0pt; line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:minor-fareast;="" mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"=""> versus 1/T and –log µ versus 1/T plots exhibited linearity. Hopping condition given by Holstein was applied. Polaron band-width (J) satisfies the inequality which shows adiabatic hopping conduction. The density of Fermi level and the density of localized states are found to be close to each other.</span

Effect of Past Electric Field on Transport Properties of 8Ov<Sub>2</Sub>O<Sub>5</Sub>-2Op<Sub>2</Sub>O<Sub>5</Sub> Semiconducting Glass

The effect of past electric field on transport properties such as dc-conductivity, activation energy etc. of 8Ov2O5-2Op2O5 semiconducting glass has been considered. The various parameters N,rp,N (EF) etc. Are calculated from Mou T1/4 analysis, and the results are discussed on the basis of the polaron model

<span style="font-size:11.0pt;line-height:115%; font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family: "Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:Arial;mso-ansi-language:EN-US;mso-fareast-language: EN-US;mso-bidi-language:AR-SA">Thermal conductivity of V₂O₅-P₂O₅ glasses</span>

291-296<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">The thermal conductivity of V2O5-P2O5 glass system has been experimentally determined in the temperature range 303-422 K. The data covered the glass composition range from 60 to 80 mol% of V2O5. It has been observed that the thermal conductivity increases linearly with temperature. The results obtained confirmed that the major contribution to the thermal conductivity of this glass system is due to lattice vibrations. The values of density, molar volume, lattice thermal conductivity (λL) band gap energy, melting temperature, electronic (λe) and bipolar component of thermal conductivity (λbp) are also reported.</span