STRUCTURE AND PROPERTIES OF CUALO2 SEMICONDUCTOR CERANICS SYNTHESIZED FROM PRECURSORS WITH DIFFERENT COPPER VALENT STATE
The samples of copper aluminate were synthesized from copper oxides with different copper oxidation state. Crystal structure of the samples was determined by X-ray diffraction and confirmed by Raman scattering data.The bandgap was determined from optical absorption spectra. P-type of electrical conductivity was confirmed by positive sign of Seebeck coefficient. The temperature dependence of conductivity was measured and activation energies were determined. The higher resistivity had the samples synthesized from Cu2O while their activation energy was lower.