Nanocrystalline and bulk Li₂TiO₃ having monoclinic structure were prepared by mechanical alloying as well as conventional ceramic route. Complex impedance analysis in the frequency range of 100 Hz–1 MHz over a wide range of temperature (50–500 ℃) indicates the presence of grain boundary effect along with the bulk contribution. The frequency-dependent conductivity plots exhibit power law dependence, suggesting three types of conduction in the material: low-frequenc...

Lithium titanate (Li₂TiO₃) is one of the most promising candidates among the tritium breeding materials because of its good tritium release capacity. Li concentration has much significance on the diffusivity of tritium in the material. The nanocrystalline single-phase Li₂TiO₃ with monoclinic structure has been prepared by high energy ball milling followed by calcination at 700 ℃ for 2 h. The field emission scanning electron microscopy (FESEM)...

The ternary phosphate glass series (50-x)CaO–xCaF₂–50P₂O₅ (x = 0–20 mol%) were synthesized using melt quench technique. Structural, optical and mechanical properties were investigated with increase in CaF₂ content. Using X-ray diffraction (XRD), synthesized glasses were confirmed to be amorphous in nature. Replacement of oxygen ions by fluorine ions increased the values of density. Decrease in refractive index due to the low pol...

It is possible to fabricate highly sensitive NTCR (negative temperature coefficient of resistance) thermistor using nano crystalline CaTiO₃ synthesized by high energy ball milling. Disc shaped green pellets were prepared and effects of sintering on the disc pellets were studied as thermistor by sintering the samples at 1000 ℃, 1100 ℃ and 1200 ℃. The as-prepared samples were characterized by X-ray diffraction (XRD), impedance analysis and electrical measurement....

The rheological behavior of aqueous Al₂O₃/SiC suspensions at different pH values was investigated by rheological measurement. Experimental results showed that at pH = 3–6, Al₂O₃ and SiC particles have opposite surface charges, and the binary suspensions have lower viscosity than the unary suspensions at shear rates of 0–300 s^-1. Furthermore, at pH = 3–12, the stability of the Al₂O₃ component seemed to dominate the ov...

Titanium oxide that has photocatalytic activity is used as white pigment for cosmetics. A certain degree of sebum on the skin is decomposed by the ultraviolet radiation in sunlight. In this work, as novel white pigment, titanium phosphates were synthesized with titanium sulfate and phosphoric acid for cosmetics. Their chemical composition, powder properties, photocatalytic activity, color phase, moisture retention, and smoothness were studied. These titanium phosphates had less photocatalytic...

Perovskite (Ba,Sr)TiO₃ glass ceramics were crystallized in the presence of La₂O₃ for glass ceramic system [(Ba_1-xSr_x)TiO₃]–[2SiO₂–B₂O₃]–[K₂O]–[La₂O₃] (x = 0.0 and 0.4). The formation of major crystalline phase of BaTiO₃ along with secondary phase of Ba₂TiSi₂O₈ was confirmed by X-ray diffraction (XRD...

Lead-free piezoelectric ceramics K_0.5Na_0.5NbO₃–xmol%K_5.70Li_4.07Nb_10.23O₃₀ (x = 0–2.5, KNN–xmol%KLN) were prepared by conventional sintering technique. The phase structure and electrical properties of KNN ceramics were investigated as a function of KLN concentration. The results showed that small amount of KLN introduced into the lattice formed a single phase perovskite structure. The KLN modifica...

The influence of adding Fe₂O₃ at the expense of Na₂O in sodium lead borate glasses on the structural, physical and electrical properties have been investigated. Results obtained from Fourier transform infrared (FTIR) spectra indicated that Fe₂O₃ plays an important role in converting three coordinated boron atoms [BO₃] to four coordinated boron atoms [BO₄]. The physical properties such as density and molar volume help...

The main subject of this work is an investigation of the effects of heating rate and current on the crystallisation of amorphous precursors in spark plasma sintering (SPS). For this, dry gel of Al₂O₃–SiO₂ with a molar ratio of 1:1, was synthesized and sintered in-situ by SPS, and also by hot pressing (HP) for comparison. Phase analysis showed that the only crystalline product in both cases was mullite, whose Al₂O₃ content was lower in the...