Abstract

The residue on ignition at 900 °C of the copy paper sample Multipaper Fabriano 100g/m² was determined to be 12.96%w/w and its XRD pattern showed the presence of lime, syn CaO, peaks placed at 2θ values of 32o, 37o, 37o, 38o, 48o, 54o, 64o, 67o, 67o, 80o, 89o, 92o, 103o, 107o which corresponded to crystal planes of 111, 002, 211, 220, 221, 311, 311, 400, 411, 420, 422 and 500. The high values of tensile force, made of 100% chemical pulp of 4.91KN/m in the machine direction and of 3.28KN/m in the cross direction of the paper sample correlated with an alkaline pH value of 8.8 and a low value of residue on ignition. Also, the average low roughness Bendtsen of the paper of 64ml/min related with the low pick resistance measured to be 1.18m/s in the machine direction and 0.19m/s in the cross direction. The residue on ignition, of the same copy paper sample, at 525 °C was also determined to be 22.8%w/w and calcite, magnesian, gallium iron sulfide was identified from their XRD pattern. The band gap energy Eg from the diffuse reflection spectroscopy study of the 100gsm A4 copy paper sample was calculated to be 1.1654879939663700eV at room temperature. The crystallographic phase of the residue on ignition at 900 °C was determined by X-Ray diffraction (XRD) and the powder diffraction pattern of CaO was indexed by trial and error and all of the peaks were assigned their hkl values. The Miller indices of the reflections were determined and also the separation of planes. The average crystallite size τ of the pattern of CaO was determined to be on average below 60nm, by using the Scherrer equation. A graphical representation of the line broadening of the diffraction peaks as a function of the crystallite size was also presented. The peak broadening factor β which was equal to FWHM of the reflections of the sample was related to the micro-strain ε and a graph was plotted and from its intercept the lattice strain was calculated to be 4.719727188044x10^-4rad.

Keywords: Residue on ignition at 900 °C; Residue on ignition at 525 °C; XRD pattern; Lime; Magnesian; Full width at half maximum (FWHM); Reflectance spectrum; Tauc plot; Band gap energy