Effect of ZnO nanoparticles on structure and magnetic properties of Li_2O-B_2O_3: TiO_2 glasses

摘要

Li_2O-B_2O_3 glasses were synthesized doping with TiO_2 and co-doping with TiO_2 as well as ZnO nanoparticles through the melt-quenching process. LB_1, LBT_2 and LBTZ_3 were the labeling of the samples. The X-ray analysis of these glass samples have shown two amorphous halos at small values of 2θ (≈ 22° and 45°), which were due to the short-range periodicity of the glass network as a result of non-bridging oxygens (NBOs). The prominent bands exhibited in FTIR spectra were due to trigonal (BO_3) and tetrahedral (BO_4) structural units and as well due to bending vibrations of B-O-B linkages. The absorption bands observed in the spectra were attributed to stretching vibration modes of O-H bonds present in the moisture in the glass samples. The rigidity of the samples follows order: LBT_2 > LBTZ_3 > LB_1. The ESR spectra of the sample LBTZ_3 has shown a spectral line centered at about g≈1.94. The addition of ZnO nanoparticles into the glass matrix leads to convert the non-magnetic glass sample into a magnetic glass material; because some of Ti~(4+) ions may be converted as Ti~(3+) ions in the melt-quenching process. Thus, we expect that these materials can find potential applications such as solid state electrolytes, humidity sensors and magnetic sensors etc.