This study was conducted to research the formation, color development and application for colored glazes of the spinel solid solutions with the composition of (Co, Zn)O(Al, Cr, Fe)
2O
3.
On specimens prepared by calcing the oxide and hydroxide mixture at 1400°C for 1 hour, the X-ray analysis, measurement of reflectance and the tests of their stability as a glaze stain were carried out. The results were summarized as follows.
1) Formation of continuous solid solution and except a few instances, obedience to Vegard's law were confirmed by means of the X-ray analysis.
2) Colors obtained in ZnO(Al, Cr)
2O
3, as the amount of Cr
3+ increased, ranged from white, through pink and grayish red to beige, and absorption of Cr
3+ shifted towards red region.
3) An increase in Fe
3+ in ZnO(Al, Fe)
2O
3, yielded the colors ranging from white through orange yellow to reddish brown, and the shift of absorption of Fe
3+ towards red region.
4) Colors developed in ZnO(Cr, Fe)
2O
3, as the amount of Fe
3+ increased, ranged from beige to reddish brown, and specific absorption resulted from the coexistence of Cr
3+ and Fe
3+ was observed within a range of 600-700mμ.
5) Colors obtained in ZnO(Al, Cr, Fe)
2O
3, (inside of the triangular coordinates) ranged from reddish orange, through light brown to reddish brown.
6) Brilliant hue, so-called cobalt-blue, developed in (Co, Zn)OAl
2O
3, and in (Co, Zn)O(Al, Cr)
2O
3, an increase in Cr
3+ yielded greenish blue and blue green, so-called peacock.
7) Colors developed in (Co, Zn)O(Al, Fe)
2O
3, as the amounts of Fe
3+ increased, ranged from greenish to dark gray.
8) An increase of Fe
3+, yielded the colors ranging from blue green to dark gray in (Co, Zn)O(Cr, Fe)
2O
3.
9) Colors obtained in (Co, Zn)O(Al, Cr, Fe)
2O
3, (inside of the triangular coordinates) ranged from grayish olive to dark gray.
10) According to the results of the colored glaze tests, except ZnO(Al, Fe)
2O
3 and (Co, Zn)O(Al, Fe)
2O
3 systems, the spinels, especially with the composition in Cr
3+ rich region, were appreciated to be stable as a glaze stain.
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