High-temperature elasticity of magnesioferrite spinel |
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| Authors: | Sytle M Antao Ian Jackson Baosheng Li Jennifer Kung Jiuhua Chen Ishmael Hassan Robert C Liebermann John B Parise |
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| Institution: | (1) Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA;(2) Research School of Earth Sciences, Australian National University, Canberra, ACT, 0200, Australia;(3) Mineral Physics Institute and Department of Geosciences, Stony Brook University, Stony Brook, NY 11794-2100, USA;(4) Department of Earth Sciences, National Cheng Kung University, 1 University Road, Taiwan, 70101, Taiwan, R.O.C;(5) Department of Chemistry, University of the West Indies, Kingston 7, Jamaica |
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| Abstract: | The elastic moduli of magnesioferrite spinel, MgFe2O4, and their temperature dependence have been determined for the first time by ultrasonic measurements on a polycrystalline
specimen. The measurements were carried out at 300 MPa and to 700°C in a gas-medium high-pressure apparatus. On heating, both
the elastic bulk (K
S) and shear (G) moduli decrease linearly to 350°C. By combining with extant thermal-expansion data, the values for the room-temperature
K
S and G, and their temperature derivatives are as follows: K
0 = 176.3(7) GPa, G
0 = 80.1(2) GPa, (∂K
S/∂T)
P
= −0.032(3) GPa K−1 and (∂G/∂T)
P
= −0.012(1) GPa K−1. Between 350 and 400°C, there are abrupt increases of 1.4% in both of the elastic moduli; these closely coincide with the
magnetic Curie transition that was observed by thermal analyses at about 360°C. |
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| Keywords: | Magnesioferrite High-temperature studies Ultrasonic Elasticity |
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