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Can I read Gray–blue Al2O3–MoOx ceramic pigments: Crystal structure, colouring mechanism and performance on EtoBox?
Gray–blue Al2O3–MoOx ceramic pigments: Crystal structure, colouring mechanism and performance by Michele Dondi; Francesco Matteucci; Giovanni Baldi; Andrea Barzanti; Giuseppe Cruciani; Isabella Zama; Claudia L. Bianchi is a Materials Science article available to read on EtoBox.
What is Gray–blue Al2O3–MoOx ceramic pigments: Crystal structure, colouring mechanism and performance about?
Grayish-blue coloured aluminaemolybdena was synthesized by high temperature reducing firing and experimented as ceramic pigment. Synchrotron light and conventional X-ray diffraction powder, ICP-OES and BET analyses proved that molybdenum spreads over alumina surface, without entering the corundum lattice, with a high superficial concentration (i.e. 27e99 Mo atoms nm À2 ) implying a prevailing octahedral coordination and a certain long-range order, eventually resulting in the formation of crystalline MoO 2 . XPS and DRS suggested the occurrence of different valences, Mo(VI) being predominant over Mo(V) and Mo(IV). The colouring mechanism is mainly due to electronic absorption of Mo(V) in the redeorange region of the visible spectrum, giving rise to a characteristic blue shade; the gray cast is caused by extensive light absorption by Mo(IV) crystal field transitions and particularly MoeO charge transfer. The colouring performance of Al 2 O 3 eMoO x in ceramic glazes and porcelain stoneware bodies for wall and floor tiles is excellent, being equivalent to the pigment coloration. Thermal stability in these matrices seems to be mostly affected by Na 2 O and MgO. However, the distinctly
Who reads Gray–blue Al2O3–MoOx ceramic pigments: Crystal structure, colouring mechanism and performance?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Michele Dondi; Francesco Matteucci; Giovanni Baldi; Andrea Barzanti; Giuseppe Cruciani; Isabella Zama; Claudia L. Bianchi
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0143-7208)
- Published
- 2008
- Language
- EN
- Field
- Materials Science (Physical Sciences)