Effects of microstructure on the sky-green color in imitating ancient Jun glazes

Abstract

The sky-green glaze of ancient Jun ware was successfully imitated with the addition of 4 wt % calcium phosphate for introducing the phosphorus (P) to the composition. Effects of the calcium phosphate contents on the chromaticity, precipitated phase and microstructure of sky-green glaze were investigated. Based on the analysis of colorimeter, XRD, FT-IR, XPS and SEM, a possible coloring mechanism was proposed to explain the variation of glaze colors with the increasing of calcium phosphate content. The results indicated that the addition of calcium phosphate contributed to increasing the content of calcium iron phosphate [Ca 19 to Fe 3+ and the increased size of phase separation droplets weakened the structural color, which increased the L* and b* value of glazes. Therefore, the color of sky-green glaze got more green and white gradually.

Comparative Study: Impacts of Ca and Mg Salts on Iron Oxygen Carriers in Chemical Looping Combustion of Biomass

“…In the literature, Ca 19 Fe 2 (PO 4 ) 14 is reported as a glaze component, so there is a risk that it can lead to a deactivation of oxygen carriers via the formation of a glassy phase. 46 CaSO 4 is a comparably stable salt under operation conditions, and it has a higher melting point than other Cabased salts used in the study. CaSO 4 can be reduced to CaS in the presence of reducing atmospheres such as H 2 and CO.…”

“…In the literature, Ca 19 Fe 2 (PO 4 ) 14 is reported as a glaze component, so there is a risk that it can lead to a deactivation of oxygen carriers via the formation of a glassy phase. 46 …”

“…The formation of this product was accompanied by some agglomeration of the mixture as well. In the literature, Ca 19 Fe 2 (PO 4 ) 14 is reported as a glaze component, so there is a risk that it can lead to a deactivation of oxygen carriers via the formation of a glassy phase …”