Fig. 4From: Temperature- and humidity-induced changes in alum-treated wood: a qualitative X-ray diffraction studyXRD 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 scaleBack to article page