Thermo-elastic property of Ca(OH)2 portlandite |
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| Authors: | H Fukui O Ohtaka T Fujisawa T Kunisada T Suzuki T Kikegawa |
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| Institution: | 1. Earth and Space Science , Osaka University , 1-1 Machikaneyama, Toyonaka, Osaka , 560-0043 , Japan;2. Environmental Engineering , The University of Kitakyushu , Fukuoka , 808-0135 , Japan;3. PF , KEK , Tsukuba , 305-0801 , Japan |
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| Abstract: | An equation of state (EoS) for Ca(OH)2 portlandite has been obtained through measurements of pressure and temperature dependence of volume by means of in-situ X-ray observation. The bulk modulus and its pressure derivative at zero pressure calculated using third-order Birch-Murnaghan's equation of state is 33.1 GPa and 4.2 at 300 K, respectively. The unit cell parameters and the volumes have been also determined at 573 K and 673 K. Temperature derivatives of the bulk modulus and its pressure derivative have been calculated to be ?0.022 GPa/K and 0.0072 K?1, respectively. Thermal expansion coefficient of portlandite has been calculated from the EoS. The pressure dependence of entropy has been obtained from the present thermo-elastic parameters. |
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| Keywords: | Portlandite High Pressure Equation Of State Thermo-elasticity X-ray Diffraction Entropy |
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