کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1505436 | 993763 | 2011 | 5 صفحه PDF | دانلود رایگان |
The precursor of nanopowder ZnO was synthesized by direct precipitation method and compacted to bulk samples. The bulk ZnO was annealed by furnace at temperature range of 400–650 °C in air for 30 min. The crystallography of precursor and bulk powder of ZnO was analyzed by the X-ray diffraction (XRD) and scanning electron microscopy (SEM) and obtained the hexagonal crystal structure, mean lattice parameters of a = b = 3.2478 Å and c = 5.2037 Å and unit cell volume of 47.53 Å3. The particle size was investigated by SEM and evaluated by XRD results about 76.28 nm and bulk density of 3494.14 kg m−3. The thermopower was measured by steady state method and obtained highest value of −92.99 μV K−1 at room temperature for annealing temperature of 550 °C.
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► Annealing at 400–650°C had effects of crystal structure, nanoparticle and thermopower of bulk ZnO.
Journal: Solid State Sciences - Volume 13, Issue 8, August 2011, Pages 1599–1603