We proposed a good calcinations condition of the ZnO disk to control the crystallography and nanoparticles in ZnO disk. The crystallography of precursor powder and disk powder were analyzed by the X-ray diffraction (XRD). The mean nanoparticles of ZnO disk was determinate by XRD results and observed by scanning electron microscope. The temperature ranges of 400℃ to 650℃ in air for 30 minutes were used calcinations ZnO disk. These temperature can be controlled the single phase, lattice parameters, unit cell volume, crystalline size, d-value, texture coefficient and bond lengths of Zn–Zn, Zn–O and O–O which correspond significantly the hexagonal crystal structure. The nanoparticles were small changed mean of 76.59 nm at the calcinations temperature range
This research has an objective to develop and fabricate thermoelectric generator (TEG) from the p-Ca3Co4O9 and n-CaMnO3 ceramic materials. The p-n materials were cut and polished to the dimension of 4 × 4 × 4 mm3 and 71 couples. The relationship between temperature difference and electrical voltage, electrical current, electrical power and conversion efficiency were measured. The electricity and efficiency of TEG showed the maximum value of 1.6 V, 300 mA, 480 mW and 0.025 % at temperature difference of 60 K.
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