Fig. 1From: The earliest known artificial synthesized ε-Fe2O3 in the Deqing Kiln ceramic ware of Tang DynastyThe ceramic ware of Deqing Kiln and the sample used in our work. a The original ceramic ware. The sample used for observation is shown by the orange triangle, and the sample used in thermal expansion experiments is shown by the green rectangular. b The optical image of the sample, where the scale bar is 5 mmBack to article page