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Fig. 4 | Heritage Science

Fig. 4

From: Temperature- and humidity-induced changes in alum-treated wood: a qualitative X-ray diffraction study

Fig. 4

XRD pattern of ammonium alum after 15 h at 40 °C, compared to pattern at 25 °C (refined lattice constant for alum, a = 12.24435(4), space group Pa-3), showing an increase in amorphous content of ca. 14%. For equivalent patterns of potassium alum the increase in amorphous content was ca. 23% at 40 °C relative to 25 °C (refined lattice constant for alum, a = 12.16551(5), space group Pa-3). Intensity in square root scale

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