Abstract
The electron spin resonance (ESR) spectra of SO −3 and SO −2 radical ions with a linewidth ΔH ≈ 2.7 G and SO −3 (A 1) and SO −3 (A 2) centers with superhyperfine splitting due to the interaction with protons in platelike gypsum single crystals under X-ray irradiation have been analyzed at 25°C. Dehydrated regions with a radius >4 Å are revealed in gypsum. The ESR spectra of SO −3 radical ions and atomic hydrogen with ΔH ≈ 0.3 G are found in the products of isothermal annealing of gypsum kept for 30 min after X-ray irradiation at 25°C. The dependences of the intensities of these spectra on the annealing temperature are studied in the range of 100–450°C. The temperature range of formation of α- and β-phase states of bassanite and γ-anhydrite are determined. The process of residual water redistribution between the channel systems of the α- and β-phase types of γ-CaSO4 in gypsum thermal derivatives is established.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
A. G. Betekhtin, Mineralogy (Gos. Izd-vo Geol. Lit, Moscow, 1950) [in Russian].
A. A. Godovikov, Mineralogy (Nedra, Moscow, 1975) [in Russian].
V. I. Spitsyn, V. V. Gromov, and L. G. Karaseva, Dokl. Akad. Nauk SSSR 159(1), 401 (1964).
Th. E. Gunter, J. Chem. Phys. 46(10), 3818 (1967).
A. R. P. L. Albuquerque and S. Isotani, J. Phys. Soc. Jpn. 51(4), 1111 (1982).
M. Kasuya, S. Brumby, and J. Chappell, Nucl. Tracks Radiat. Meas. 18(3), 329 (1991).
R. A. Khasanov, N. M. Nizamutdinov, N. M. Khasanova, et al., Crystallogr. Rep. 53(5), 806 (2008).
C. Bezou, A. Nonat, J.-C. Mutin, et al., J. Solid State Chem. 117, 165 (1995).
A. Abragam and B. Bleany, Electron Spin Resonance of Transition Metal Ions (Claredon Press, Oxford, 1969).
M. J. Mombourquette, J. A. Weil, and D. G. McGavin, EPR-NMR USER’S Manual (Department of Chemistry, University of Saskatchewan, Canada, 1996).
P. W. Atkins and M. C. R. Symons, The Structure of Inorganic Radicals. An Application of Electron Spin Resonance to the Study of Molecular Structure (Amsterdam, 1967).
B. F. Pedersen, Acta Crystallogr. B 38, 1074 (1982).
N. M. Nizamutdinov, N. M. Khasanova, R. A. Khasanov, et al., Proc. RSNE-NBIK, Moscow, 2009 (IK RAN-RNTs KI, Moscow, 2009), p. 361.
R. A. Khasanov, N. M. Nizamutdinov, N. M. Khasanova, et al., Proc. X Int. Sci. Conf. “Nanotekh-2009”, Kazan, 2009), p. 307.
R. A. Khasanov, N. M. Nizamutdinov, N. M. Khasanova, et al., Proc. V Int. Sci.-Practical Conf. “Increasing the Efficiency of Production and Application of Gypsum Materials and Products”, Kazan, 2010, p. 116.
H. Bruckner, E. Dayler, G. Fitch, et al., Gypsum: Production and Application of Gypsum Building Materials (Stroiizdat, Moscow, 1981) [in Russian].
N. B. Singh and B. Middendorf, Prog. Crystal Growth Characterization 53, 57 (2007).
R. A. Khasanov, Extended Abstract of Cand. Sci. Dissertation in Physics and Mathematics (KGU, Kazan, 1980).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © R.A. Khasanov, N.M. Nizamutdinov, N.M. Khasanova, R.I. Salimov, R.I. Kadyrov, V.M. Vinokurov, 2014, published in Kristallografiya, 2014, Vol. 59, No. 3, pp. 443–450.
Rights and permissions
About this article
Cite this article
Khasanov, R.A., Nizamutdinov, N.M., Khasanova, N.M. et al. Phase states of the gypsum thermal-annealing derivatives according to electron spin resonance spectra. Crystallogr. Rep. 59, 399–406 (2014). https://doi.org/10.1134/S1063774514030110
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063774514030110