NDLI: Elasticity and equation of state of Li2B4O7

Content Provider	Springer Nature Link
Author	Trots, Dmytro M. Kursov, Alexander Vasylechko, Leonid Berkowski, Marek Boffa Ballaran, Tiziana Frost, Daniel J.
Copyright Year	2011
Abstract	A single crystal X-ray diffraction study on lithium tetraborate Li2B4O7 (diomignite, space group I41 cd) has been performed under pressure up to 8.3 GPa. No phase transitions were found in the pressure range investigated, and hence the pressure evolution of the unit-cell volume of the I41 cd structure has been described using a third-order Birch–Murnaghan equation of state (BM-EoS) with the following parameters: V 0 = 923.21(6) Å3, K 0 = 45.6(6) GPa, and K′ = 7.3(3). A linearized BM-EoS was fitted to the axial compressibilities resulting in the following parameters a 0 = 9.4747(3) Å, K 0a = 73.3(9) GPa, K′ a = 5.1(3) and c 0 = 10.2838(4) Å, K 0c = 24.6(3) GPa, K′ c = 7.5(2) for the a and c axes, respectively. The elastic anisotropy of Li2B4O7 is very large with the zero-pressure compressibility ratio β 0c /β 0a = 3.0(1). The large elastic anisotropy is consistent with the crystal structure: A three-dimensional arrangement of relatively rigid tetraborate groups [B4O7]2− forms channels occupied by lithium along the polar c–axis, and hence compression along the c axis requires the shrinkage of the lithium channels, whereas compression in the a direction depends mainly on the contraction of the most rigid [B4O7]2− units. Finally, the isothermal bulk modulus obtained in this work is in general agreement with that derived from ultrasonic (Adachi et al. in Proceedings-IEEE Ultrasonic Symposium, 228–232, 1985; Shorrocks et al. in Proceedings-IEEE Ultrasonic Symposium, 337–340, 1981) and Brillouin scattering measurements (Takagi et al. in Ferroelectrics, 137:337–342, 1992).
Starting Page	561
Ending Page	567
Page Count	7
File Format	PDF
ISSN	03421791
Journal	Physics and Chemistry of Minerals
Volume Number	38
Issue Number	7
e-ISSN	14322021
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-04-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diomignite Lithium Tetraborate Li2B4O7 Single crystal equation of state Geochemistry Mineralogy Mineral Resources Crystallography
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Materials Science

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