This study was concerned with the formation and color development of the spinel solid solution in CoO-MgO-Al
2O
3-Cr
2O
3-TiO
2 system, and its application to colored glazes.
Specimens were prepared by calcining the oxide and hydroxide mixture at 1450°C for 1h. The formation of spinel solid solution was examined by X-ray diffraction, the color was discussed by measuring the spectral reflectance, and the stability of the spinel in glazes was tested.
The results were summarized as follows.
1) Formation of a continuous solid solution was confirmed by X-ray analysis.
2) As the amount of Cr
3+ increased in MgO-Cr
2O
3-TiO
2 system, the color changed from white through leaf to grayish leaf, and the absorption of Cr
3+ shifted towards short wavelength region.
3) An increase of Al
3+ in MgO-Cr
2O
3-Al
2O
3 system, caused the color to change from grayish leaf through grayish yellow and pink to white, and the absorption of Cr
3+ shifted towards short wavelength region.
4) The color developed in MgO-Al
2O
3-Cr
2O
3-TiO
2 system, ranged from leaf through grayish leaf to grayish yellow.
5) An increase of Cr
3+ in Coo-MgO-Cr
2O
3-TiO
2 system, yielded the colors ranging from turquoise through dull green to turquoise, and the absorption of Cr
3+ and Co
2+ shifted towards short wavelength region.
6) As the amount of Al
3+ increased in Coo-MgO-Cr
2O
3-Al
2O
3 system, the colors ranging from turquoise through strong greenish blue to bright purplish blue developed, and the absorption of Cr
3+ and Co
2+ shifted towards short wavelength region.
7) As the amount of Al
3+ increased in CoO-MgO-Al
2O
3-TiO
2 system, the color changed from turquoise through dull greenish blue to bright purplish blue, and the absorption of Co
2+ shifted towards short wavelength region.
8) The colors ranging from turquoise through green to bright blue developed in CoO-MgO-Al
2O
3-Cr
2O
3-TiO
2 system.
9) According to the result of the colored glaze test, formation of a new spinel was observed in magnesia-lime glaze, and brilliant hue similar to peacock developed over the wide range of CoO-MgO-Al
2O
3-Cr
2O
3-TiO
2 system in lime glaze. Specimens with the composition of Cr
3+ rich region were stable as a glaze stain.
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