Open AccessPhase transition of Cd(OH)2 and physical properties of CdO microstructures prepared by precipitation method for optoelectronic applications
Author(s) -
Walid Ismail,
Abdelhamid El-Shaer,
Mahmoud Abdelfatah
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/956/1/012006
Subject(s) - monoclinic crystal system , materials science , microstructure , calcination , cadmium oxide , annealing (glass) , precipitation , hexagonal phase , phase (matter) , crystallography , crystal structure , chemical engineering , hydroxide , cadmium , hexagonal crystal system , analytical chemistry (journal) , chemistry , metallurgy , chromatography , biochemistry , physics , organic chemistry , meteorology , engineering , catalysis
Low cost precipitation technique is employed here to have CdO microstructures as a promising material for optoelectronic applications. Cadmium nitrate hexahydrate and sodium hydroxide were mixed together to have white precipitate of cadmium hydroxide. The product white precipitate then dried at 100 °C followed by different annealing temperatures (200, 300, 400 and 700 °C) for 2 h. The formed samples are characterized employing XRD, SEM, and TEM techniques to investigate the structural and morphology properties. The XRD results indicate that as prepared exhibited hexagonal ß-Cd(OH) 2 phase. For annealed samples at 200, mixed phases of γ-Cd(OH) 2 hexagonal as well as monoclinic were appeared. γ-Cd(OH) 2 monoclinic phase and CdO cubic phase were formed with calcined temperature of 300°C. Pure cubic phase of CdO crystal structure was obtained at 400°C. With higher annealed temperature of 700°C, both cubic phases of CdO and CdO 2 are appeared. The results designate that CdO microstructures formed with single-phase formation of cubic structure at 400°C, which is the most advantageous for optoelectronic applications.