Raman identification of strongly absorbing phases: the ceramic black pigments
Article first published online: 28 AUG 2010
Copyright © 2010 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 42, Issue 4, pages 839–843, April 2011
How to Cite
Caggiani, M. C. and Colomban, P. (2011), Raman identification of strongly absorbing phases: the ceramic black pigments. J. Raman Spectrosc., 42: 839–843. doi: 10.1002/jrs.2777
- Issue published online: 19 APR 2011
- Article first published online: 28 AUG 2010
- Manuscript Accepted: 13 JUL 2010
- Manuscript Received: 29 MAY 2010
To get black decorations requires high ceramic technology and there are different ways of achieving this. Their identification can be very useful to discriminate between different manufactures or periods of production but this information is often very hard to achieve because of their strong absorption of the illuminating laser beam, whatever the wavelength used, causing a very low scattering intensity and, in case of power increase, a transformation of phase which may lead to the misinterpretation of the spectra obtained. We test the use of five instruments with different characteristics (wavelength and power of excitation, spectral resolution, filters and microscope) applied to a group of heterogeneous samples which have in common the presence of a black glaze. The results obtained (manganese oxides, cobalt oxides or a mixture of the two even with the addition of haematite) are compared considering the different methodologies used and leading to a preference towards high-sensitivity rather than high-resolution spectrometers, notch-filtered rather than edge-filtered instruments and microscopic configuration used on freshly created cross-sections. The importance of the objective choice is demonstrated. Small grains may be preferred. Copyright © 2010 John Wiley & Sons, Ltd.