Micro-structural study of Yaozhou celadons (Tang to Yuan Dynasty): probing crystalline and glassy phases

Abstract

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Morphological and structural study of crystals in black-to-brown glazes of Yaozhou ware (Song dynasty) using imaging and spectroscopic techniques

“…Magnetite clusters were also reported in the glaze of a brown Ding ware deep under layers containing only ε-Fe 2 O 3 [15]. Two broad peaks are also present at c. 500 and 1000 cm -1 which could be explained with the bending and stretching modes of the [SiO 4 ] ntetrahedron of the glassy matrix [19]. Fig.…”

“…In order to investigate the depth of the glaze, cross-sections of each fragment was made following the preparation method described in detail in reference [19].…”

Nondestructive study of glassy matrix of celadons prepared in different firing temperatures

“…The B5-B9 samples display two similar broad bands positioning at approximately 500 and 1,000 cm À1 , corresponding with the [SiO 4 ] nÀ tetrahedron bending and stretching modes, respectively. [20][21][22][23][24][25]37] It identified that the intensity of bending vibration mode decreased with increasing firing temperatures from 1,100 C (B5) to 1,300 C (B9), whereas that of stretching vibration mode increased accordingly. Besides, the peak position of the [SiO 4 ] nÀ stretching vibration mode moved towards the higher wavenumber.…”

“…Raman spectroscopy, a nondestructive technique, is able to research the nature of vitreous glazes. [17][18][19][20][21][22][23][24][25][26][27] The glass network structure is composed of [SiO 4 ] 4À tetrahedral structure units containing different amounts of bridging oxygen. They are covalent and can exhibit remarkable Raman characteristics.…”

“…[22] Raman analyses were also performed on Yaozhou ceramics to confirm that the firing temperature of celadon in the Yuan Dynasty is higher than that in Wudai Dynasty. [23] However, the above research was mainly concerning ancient ceramics. Few studies were conducted to investigate the evolution of chemical compositions, structures of crystals, and the glassy matrix of glazes in the thermal process.…”