Open AccessSYNTHESIS OF ENVIRONMENTALLY FRIENDLY (Bi, Ca, Zn)VO4 INORGANIC YELLOW PIGMENTS
Author(s) -
Trần Ngọc Tuyền,
Nguyễn Đức Vũ Quyên,
Hồ Văn Minh Hải,
Đặng Xuân Tín,
Dao Thi Phuong
Publication year - 2017
Publication title -
vietnam journal of science and technology/science and technology
Language(s) - English
Resource type - Journals
eISSN - 2815-5874
pISSN - 2525-2518
DOI - 10.15625/0866-708x/55/1/8215
Subject(s) - pigment , scheelite , crystallinity , nuclear chemistry , scanning electron microscope , materials science , zinc , zinc phosphate , mineralogy , chemistry , metallurgy , organic chemistry , composite material , tungsten
In this paper, the synthesis of scheelite based environmentally friendly inorganic yellow pigments was presented. The pigments of Bi1-x-yCaxZnyVO4-(x+y)/2 (x = 0.1 ÷ 0.9, y = 0.1 ÷ 0.9) have been prepared by the evaporation to dryness from BiONO3, Ca(NO3)2.4H2O, Zn(NO3)2.6H2O and NH4VO3. The obtained powders were characterized by Thermal Analysis (TG-DSC), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and CIE L*a*b* colour measurement. The results showed that the pigments calcinated at 650oC for 6 hours with the heating rate of 5oC.min-1 possessed single phase of scheelite with good crystallinity. The yellow colour intensity was a function of the amount of calcium (II) and zinc (II) ions. The colour of Bi0.70Zn0.30VO3.85 sample was similar to the lemon yellow PbCrO4 (BASF1522) pigment made by Hangzhou Emperor Pigment Company (China).