Abstract
The multicomponent glasses doped with chromium oxide (30-x)MO-xAl2O3-15Bi2O3-54.5B2O3-0.5 Cr2O3(M=Pb, Zn, Cd) (where x = 0, 5, 10 and 15 mol%) named as [MABBCr] were prepared by the melt quenching method. XRD studies confirms the amorphous nature of the prepared glass samples. In all the glass systems [PABBCr], [ZABBCr] and [CABBCr], on increasing MO from 15 to 30 mol% (by decreasing Al2O3 from 15 to 0 mol% with a step of 5 mol% in all the systems) it was observed density is increasing with MO content. Since the crystal density of PbO, ZnO and CdO dominates over the crystal density of Al2O3. In all the three glass systems molar volume decreases non linearly showing exactly opposite behaviour to the density. The EPR and FTIR spectral studies were carried out at room temperature. The EPR spectra exhibited three resonance signals, an intense absorption line centered at g = 2.00 and a combination of two absorption lines corresponding to g = 4.26 and 5.21. The EPR spectra of high field resonance signal g ∼ 2.0 is due to exchange coupled pairs of Cr3+ ions only. It was concluded that Cr3+ existed in the manner of an exchange coupled pair in alumino bismuth borate glasses. The number of spins participating in the resonance (N) for the resonance signal g ∼ 2.0 and also paramagnetic susceptibility (χ) are estimated. From FTIR studies revealed the vibrations of metal cation Pb2+, Zn2+ and Cd2+ are appearing as a small kink around 470 cm−1 in all the three glass systems. For ZABBCr and CABBCr glass systems the band is seen around 1450 cm−1 is due to the asymmetric stretching vibrations of B-O bonds in [BO3] units. This band is not observed in PABBCr glass system. From Optical absorption spectra the values related to optical band gap and Urbach energy, crystal field and Racah parameters are obtained. The optical absorption spectra of PABBCr glass system have shown two absorption bands while the absorption spectra of ZABBCr and CABBCr glass systems revealed three absorption bands. It was observed that for CABBCr glass system the optical band (Eopt) values are decreasing with the increase of CdO content. In ZABBCr, PABBCr glass systems, (Eopt) values are varying non -linearly with ZnO and PbO content.
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