Jun ware glazes: Chemistry, nanostructure and optical properties

Abstract

A set of the Classic and official Jun ware shards found at various kilns at Yuzhou (Henan) are analyzed. The blue color and milky appearance of the glazes subject of intense debate as being due to either the glaze nanostructure or chemistry. The presence of submillimetre areas showing different color and opacity gives to the glazes a three dimensional cloudy sky appearance. Nanostructure and chemistry of the glazes, oxidation state of iron and nature of the copper nanoprecipitates are studied at a submillimetre level. Images of the glaze nanostructures are obtained using a Focus Ion Beam and Scanning Electron Microscope with nanometric resolution. The size and volume fraction of the nanostructures determined by image treatment are related to the chemical composition of the glazes. Differences between kiln productions are found and the origin of the color and opacity of the glazes discussed in terms of the chemistry and nanostructure.

Handheld X-ray Fluorescence (XRF) Versus Wavelength Dispersive XRF: Characterization of Chinese Blue-and-White Porcelain Sherds Using Handheld and Laboratory-Type XRF Instruments

“…[35][36][37][38][39] As mentioned above, the analyses aim to identify the body, glaze, and coloring agent constituents, as well as to resolve the discussion of the authenticity of the objects. Most studies focus on excavated materials, 24,[40][41][42][43][44][45][46][47] which are more reliable for authenticity and provenance determination, but generally consist of kiln waste remains. Masterpieces preserved at museums, art galleries, and/or private collections, which are artistically considered as the most representative artifacts, also require similar scientific investigations and comparison using measurements on excavated kiln waste.…”

New perspective on Jun glaze corrosion: study on the corrosion of light greenish blue and reddish purple glazes from Juntai Kiln, Yuzhou, Henan, China

“…The blue/green colors are related to both iron oxide colorant and the blue-opaque caused by the microstructure change of liquid-liquid phase separation [26]. The purple/red colors are the result of the presence of small copper metal nanoparticles or even copper sulfide particles [27]. Moreover, the presence of unmelted quartz, micro-crystallites, bubbles and cracks is also responsible for the opalescence.…”

Mechanisms of pattern and colour generation of Chinese Tianmu glaze

“…The scattering intensity is determined using the following formula. 16,18 IðlÞ scattering f IðlÞ incident l 4…”

“…The structural colour of the glaze is caused by optical effects (e.g., interference, diffraction, and reection), when the size range of the particles is comparable to the optical wavelength range. 16,18 The XRD pattern (Fig. 3(b)) indicates that in the oil spot area the crystalline phases are mainly magnetite and hematite.…”

“…Many experts have studied phase-separated crystalline glazes such as Tianmu glaze. [1][2][3][4][5][6][7][8][9] In this paper, the microstructures of oil spot Tianmu glaze were studied, and the formation mechanism of oil spot speckles was probed into. Zhou et al 1 investigated a commercial Tianmu glaze bowl and a sample that they prepared.…”