2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

Presentation information

Oral presentation

R3: High-pressure science and deep Earth’s material

Sun. Sep 18, 2022 9:00 AM - 12:15 PM B253 (Adv. Edu. Res. Bldg. E-2F)

Chairperson:Takaaki Kawazoe(Hiroshima Univ.), Masayuki Nishi(Osaka Univ.)

10:45 AM - 11:00 AM

[R3-07] Determination of thermal expansivity of calcium ferrite-type MgAl2O4

*Hiroshi Kojitani1, Mei Gonai1, Yoshiyuki Inaguma1, Masaki Akaogi2 (1. Gakushuin Univ., 2. Univ. of Tokyo)

Keywords:calcium ferrite, MgAl2O4, thermal expansivity, high-temperature X-ray diffraction measurement

In this study, calcium ferrite-type MgAl2O4 sample was prepared by several high-pressure synthesis runs and its thermal expansivity was determined by performing powder X-ray diffraction measurements in the temperature range of 303-673 K with 50 K interval. When the thermal expansivity was expressed as a linear function of temperature (α = a + bT), thermal expansion coefficients were obtained to be a = 2.46(13)x10-5 (1/K) and b = 1.2(3)x10-8 (1/K2) by the least squares fitting of unit cell volume-temperature data.