Anhydrite: a refinement

Abstract

Abstract. CaSO4 (Berchtesgaden, Germany): orthorhombic, Bmmb, a = 6"992 (1), b = 6.999 (1), c = 6-240 (1) /~, Z=4, Dx=2"96 g cm -3. Refinement with diffractometer data yielded a final R value of 0.021. The two independent S-O bond lengths are 1.474 (2) and 1.475 (2)/k.Introduction. Intensities were collected from a cubeshaped crystal (edge length about 0.12 mm) with a Rigaku automated four-circle diffractometer and Mo K~ radiation monochromatized by a graphite plate. The co-20 scan technique was employed with a scan speed of 2 ° rain -I in o9. In all, 266 independent reflexion data were obtained within the range 20 < 70 °. Intensities were corrected for Lorentz and polarization

Non-destructive spectroscopic characterization of parchment documents

“…On the inked area, the CaCO 3 layer is hardly visible, but small crystals appear. The octahedrical shape [17] and the EDS spectrum support their identification as anhydrite (CaSO 4 ).…”

Evidence of a new phase in gypsum–anhydrite transformations under microwave heating byin situdielectric analysis and Raman spectroscopy

“…Each stage has its own industrial relevance for different applications, and this leads to the involvement of different disciplines in their study. The terminology related to these materials in the literature uses mineral, chemical, and technical nomenclature, [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] whose equivalences are summarized in Table 1.…”

A New High Sensitive CaSO4 : Dy Thermostimulated Luminescence Phosphor

“…In fact grinding was seen to enhance slightly certain TSL peaks at the expense of the dosimetric peak in CaSO 4 : Dy (P). Table 2 shows the XRD data of CaSO 4 : Dy (P) and CaSO 4 : Dy (N) phosphor powders (<75 mm) along with the CaSO 4 powder diffraction data from JCPDS-file [23]. Though the different lines occur at nearly the same d spacings in all the three samples, the relative intensities of almost all the minor lines are considerably reduced in N.…”