Single-crystal elasticity of SrCO3 by Brillouin spectroscopy. Issue 2 (3rd April 2017)

• Record Type: Journal Article
• Authors: Biedermann, N.; Winkler, B.; Speziale, S.; Reichmann, H. J.; Koch-Müller, M.
• Is Part Of: High pressure research. Volume 37:Issue 2(2017)
• Page Start: 181
• Page End: 192
• Publication Date: 2017-04-03
• Subjects: Brillouin spectroscopy -- strontianite -- elasticity -- elastic tensor; High pressure (Science) -- Periodicals; High pressure (Technology) -- Periodicals; 536.41
• DOI: 10.1080/08957959.2017.1289193
• Languages: English
• ISSNs: 0895-7959

Abstract

ABSTRACT: The elastic stiffness tensor cij of synthetic strontianite (SrCO3 ) was determined by Brillouin spectroscopy at ambient conditions. An inversion procedure based on Christoffel's equation was used to determine the 9 independent elastic coefficients of orthorhombic strontianite from acoustic velocities measured along 69 different crystallographic directions in 3 randomly oriented crystal platelets. The best fit values of c 11, c 12, c 13, c 22, c 23, c 33, c 44, c 55 and c 66 are 153(1), 52(1), 38(11), 109.6(8), 43(15), 75(1), 28.0(5), 28.6(4) and 33.2(5) GPa, respectively. The linear compressibilities of a -, b - and c -axis at ambient conditions are 3(2), 4(6) and 10(8) 10 −3 GPa −1 . The adiabatic bulk modulus of strontianite is 64(4) GPa, intermediate between aragonite (CaCO3 ) and witherite (BaCO3 ), thus confirming a systematic linear relationship between cation radius and bulk modulus in aragonite-type carbonates. The shear modulus of strontianite has a value of 31(1) GPa, which is about 10% smaller in comparison to aragonite.