Local structures and electronic band states of α-Fe2O3 polycrystalline particles included in the red-color overglazes and the transparent glazes of the Kakiemon-style porcelains by means of X-ray absorption spectra (i)

Abstract

Kakiemon-style porcelain is mainly characterized by the porcelain body of white color or milky-white color and the elegant and bright patterns of the colored overglazes on its white body. The porcelains were first developed and completed by Kakiemon-kiln family in 1650-80's. The red-color overglazes and the transparent glazes of the present porcelain pieces, which were produced in the early 17th century to the middle 18th century, have been investigated by means of X-ray absorption spectrum using synchrotron radiation. The structure of α-Fe2O3 as red-color emission element is slightly deformed in the red-color overglazes by the other surrounding oxides (SiO2, Al2O3, K2O, Na2O, MgO, PbO), and/or the new complexes of (SiO2-Al2O3,) systems constructed by the raw materials. The Fe ions in the transparent glazes are in the glass-state with the other oxides. However, the electronic valence, Fe3+, of Fe ions is the same with that of the α-Fe2O3 in the red-color overglazes. The lead oxides (PbO, Pb3O4) used in the Edo period to increase the brightness in the fritted red-color overglazes were perfectly decomposed, and Pb ions were in the glass-state of the porcelains.

Propriedades estruturais e eletrônicas de óxidos de ferro em esmaltes celadon (II)

“…The refinements are always monitored by a convergence factor RF (={Σ|Х obs (K)-kХ cal (K)| 2 }/Σ|Х obs (K)| 2 ), where k is a scale factor. The details were already reported [9]. Fig.…”

Controlling the Color of Lead-Free Red Overglaze Enamels and a Process for Preparing High-Quality Red Paints

“…Although Takada’s report constitutes a pioneering study that tried to scientifically elucidate the essence of akae , the effect of particle dispersibility of hematite and its microstructure on the color of akae remains insufficiently understood. Recently, although some detailed investigations have been done into akae of the old Imari and Chinese porcelain from the historical viewpoint by using a state-of-the-art analytical method, the essential coloring mechanism of akae is still not clear. ,,− …”

Correlation between glaze-colors and structural properties of the HIZEN celadons produced in the Edo period of Japan, by means of X-ray diffraction (І)

“…Recently, we have studied the structural and electronic properties of the red-colored overglazes on the HIZEN colored porcelains, produced at Arita areas from the 17 th to 18 th century, by means of X-ray diffraction (XRD) and X-ray absorption spectrum (XAS), using synchrotron radiation [18][19][20]. In the present paper, we report the technical and historical correlations among the celadon glazes of the HIZEN celadons produced in the Edo period by means of the same methods of the XRD and XAS using synchrotron radiation, in addition to X-ray fl uorescence analysis.…”