Spectroscopy and diffraction using the electron microscope

Sciau, Philippe; Godet, Marie

doi:10.1016/b978-0-12-818860-6.00001-5

Cited by 2 publications

(1 citation statement)

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“…However, the use of non-purified raw materials by the ancient craftsmen, for instance in the production of ceramics (Sciau & Goudeau, 2015), often led to very complex structures and composite systems of chemically close phases, which require significant instrumental developments and suitable strategies to describe thoroughly their whole structure. In addition to conventional analytical methods, such as Raman spectroscopy, scanning electron microscopy (SEM) or X-ray diffraction (XRD), it can sometimes be necessary to complement these studies with nanoscale investigations to obtain an in-depth understanding of the materials composing the artefacts (Sciau & Godet, 2021). These data are essential to the comprehensive understanding of the chemical processes taking place during manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Study of the epitaxy between ɛ-Fe₂O₃, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques

Holé,

Brunet,

Joulié

et al. 2024

J Appl Crystallogr

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Black-to-brown Chinese ceramics have sparked the interest of material scientists since the widespread discovery of complex dendritic structures containing mainly the rare ɛ-Fe2O3 polymorph in their glazes. This study proposes to tackle this issue using two electron diffraction mapping techniques, transmission Kikuchi diffraction and automated crystal orientation mapping–precession electron diffraction, which have not been fully exploited despite their relevance for studying these structures at the scales of interest. It first demonstrates the efficiency of applying these techniques to characterize the structures at the nanoscale and discusses some limitations that may be encountered, in particular due to the specificity of heritage samples. It then focuses on the crystalline orientations obtained with these techniques, which highlight epitaxial relationships among the crystalline planes (001) of the ɛ-Fe2O3 phase, (0001) of the hematite and (111) of the spinel. Finally, it discusses the growth of such complex multi-phase structures by proposing two possible mechanisms, one based on the transformation of ɛ-Fe2O3 into hematite and spinel, and the other based on the growth of hematite and spinel on already crystallized ɛ-Fe2O3 dendrites. It also compares the dendritic structures of the two modern samples with those found in an ancient sample of Jian ware.

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Section: Introductionmentioning

confidence: 99%