High-temperature elasticity of magnesioferrite spinel |
| |
Authors: | Sytle M. Antao Ian Jackson Baosheng Li Jennifer Kung Jiuhua Chen Ishmael Hassan Robert C. Liebermann John B. Parise |
| |
Affiliation: | (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 |
| |
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. |
| |
Keywords: | Magnesioferrite High-temperature studies Ultrasonic Elasticity |
本文献已被 SpringerLink 等数据库收录! |
|