Structural and Dielectric Properties of Sintering Zinc Oxide Bulk Ceramic

Abstract

Undoped zinc oxide (ZnO) has been prepared at various growth temperatures by conventional sintering process. The morphology and crystalline properties of ZnO pellets were examined by scanning electron microscopy, atomic force microscopy and X-ray diffraction. It has revealed that the grain size and surface roughness tends to increase by increasing the sintering temperature. XRD analysis showed that all samples are polycrystalline with a hexagonal wurtzite structure. The alignment of ZnO grains along the (10.0) plane was enhanced as the temperature increased. Interestingly, the compressive stress was found to decrease drastically from –0.62 GPa at 700°C to –0.2 MPa at 1000°C. This improvement in film structure seems to enhance considerably the dielectric properties for the samples sintering at high temperatures. Results show an increase of dielectric constant and a decrease of electrical resistivity when increasing the sintering temperature

Studies of the Atomic and Crystalline Characteristics of Ceramic Oxide Nano Powders after Bio field Treatment

“…Zinc oxide (ZnO) is a common example of TMO which has been used in fabrication of light emitting diodes (LEDs), Varistors (a ceramic resistor which used to protect electronic circuits from high voltages) due to its wide band gap (3.37eV) and large excitation binding energy [2][3][4]. On the other hand iron oxide (Fe 3 O 4 ) is mainly utilized in fabrication of biosensors due to its low inherent toxicity, biocompatibility and strong paramagnetic behaviour [5].…”

Rapid and High-Efficiency Laser-Alloying Formation of ZnMgO Nanocrystals

“…1b . According to previous reports 26 27 , the values of lattice strain in ZnO can be calculated by the following equation:…”

Structural and Optical Properties of Zn<sub>x-1</sub>Mg<sub>x</sub>O Ceramic Composites

“…As shown in the inset (Figure 1), the intensity of (0002) XRD peak decreases and shifts towards high 2θ angles as the MgO content increases from 0% to 40%. This result suggests that the lattice parameter along the c-axis decreases indicating a compressive strain [20]. The grain sizes, lattice parameters, strains and residual stress values were calculated and presented in the Table 1.…”