Study of the vibrational spectrum of cuprorivaite.
In this research, after tracing a history of the pigment, the preparation and analysis of samples of Egyptian blue have been reported. The main reactions taking place during its preparation are indicated. X-ray diffractions show that, starting from mixtures of precursors with stoichiometric composition, the product is practically only cuprorivaite. The kind of flux and cristallinity of silica does not seem determining factors for the pigment formation. Infrared and Raman spectra and an assignment of the bands are reported. Impurities ascertained are discussed on the basis on the data available.
Baraldi
P
P
Dipartimento di Chimica, Università di Modena e Reggio E., Via Campi 183, 41100 Modena, Italy. baraldi.pietro@unimo.it
Bondioli
F
F
Fagnano
C
C
Ferrari
A M
AM
Tinti
A
A
Vinella
M
M
D003300:Copper / Q000737:chemistry*; D004534:Egypt; D049671:History, 18th Century; D049673:History, 20th Century; D049690:History, Ancient; D049691:History, Medieval; D008855:Microscopy, Electron, Scanning; D010860:Pigments, Biological / Q000737:chemistry* / Q000266:history; D017640:Silicates / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013818:Thermogravimetry; D014961:X-Ray Diffraction
D010860:Pigments, Biological; D017640:Silicates; D003300:Copper