Fig. 2
From: The earliest known artificial synthesized ε-Fe2O3 in the Deqing Kiln ceramic ware of Tang Dynasty
The XRD spectrum of the sample’s brown area, the thermal expansion curve, and the schematic diagram of the experimental regions in this paper. a The experimental XRD spectrum. The peak positions of relevant phases are shown by different symbols and the Miller indexes are labeled. Here the red, green, blue, cyan and magenta stand for α-Fe2O3, quartz, mullite, ε-Fe2O3 and Al-doped ε-Fe2O3, respectively. It can be seen that the ε-Fe2O3 and α-Fe2O3 coexist here. b The sample’s thermal expansion curve. c and d are optical and SEM back-scattering images of the sample’s brown area, and the regions of the following experiments are shown by red circles