5. 長石の熱力学的性質
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概要
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In this paper, thermodynamic properties of the feldspars has been described. The values of molar enthalpies (H^0_T), entropies (S^0_T) and free energies (G^0_T) of microcline, adularia, high sanidine, KAlSi_3O_8 glass, low albite, high albite, NaAlSi_30_8 glass and anorthite at one atmosphere and at high temperatures (298.15〜1400°K) are calculated, and the results are shown in Table I. The specific heats at one atmosphere (C_p)^0_T of these minerals at high temperatures are as follows: (C_p)^0_T=6.708×10^<-3>T+71.544-28.054×10^55T^<-2> (cal mol^<-1>.deg^<-1>.).........microdine, adularia, and sanidine; (C_p)^0_T=17.282×10^<-3>T+62.092-14.253×10^5T^<-2> (cal mol^<-1>.deg^<-1>.).........K AlSi_3O_8 glass; (C_p)^0_T=9.084×10^<-3>T+67.263-21.947×10^5T^<-2> (cal mol^<-1>.deg^<-1>.).........low albite; (C_p)^0_T=9.086×10^<-3>T+68.435-21.946×10^5T^<-2>........high albite; (C_p)^0_T=15.022×10^<-3>T+64.434-19.897×10^5T^<-2> (cal mol^<-1>.deg^<-1>.).........NaAl Si_2O_8 glass, (C_p)^0_T=11.968×10^<-3>T+65.939-18.112×10^5T^<-2> (cal mol^<-1>.deg^<-1>.).........anorthite. The values calculated from these equation are shown in Table 2-1. The molarvolumcs(V^0_T) and the coefficients or thermal expansion (α^0_T) at one atmosphere of low albite and high albite are as follows: (V^0_T)_<L-Ab>=-12.7006×10^<-11>T^3+1.0392×10^<-6>T^2+14.5962×10^<-4>T+99.5491(cm^3mol.10^<-1>).........low albite, (V^0_T)_<H-Ab>=-13.2053×10^<-10>T^3+4.1554×10^<-6>T^2-8.6737×10^<-4>T+100.3247 (cm^3mol^<-1>.)......high albite, (α^0_T)_<L-Ab>=1/((V^0_<298>)_<L-Ab>)(-38.1018×10^<-11>T^2+2.0784×10^<-6>T+14.5962×10^<-4>),deg.^<-1>.........low albite, (α^0_T)_<H-Ab>=1/((V^0_<298>)_<L-Ab>)(-39.6159×10^<-10>T^2+8.3108×10^<-6>T-8.6737×10^<-4>),deg.^<-1>.........high albite. The values calculated from these equations are shown in Table 2-2. The molar volumes (V^0_<298>) of the sanidine-high albite solid solution series and the microcline-low albite solid solution series has been calculated from the equations of WALDBAUM and THOMPSON (1968) and WALDBAUM and ROBIE (1971). The results are shown in Tables 3 and 4. The equations for the calculation of the molar free energies (G^0_<298>) at one atmosphere and temperature 298.15°K of the sanidine-high albite solid solution series and the microcline-low albite solid solution series are obtained applying the methods of THOMPSON and WALDBAUM (1969) and BACHINSKI and MULLER (1971). The equations are as follows: (G^0_<298>)=(-950.813)N_<Ab>,+(-961.355)N_<Or>+RT(N_<Ab>lnN_<Ab>+N_<Or>lnN_<Or>)+{6.327-(0.004632×298.15)N^2_<Or>N_<Abgt+{7.672-(0.003857×298.15)}N_<Or>N^2_<Ab> (Kcal mol^<-1>.).........sanidine-high albite solid solution series; (G^0_<298>)=(-952.113)N_<Ab>,+(-961.909)N_<Or>+RT(N_<Ab>lnN_<Ab>+N_<Or>lnN_<Or>)+{7.973-(0.00648×298.15)N^2_<Or>N_<Ab>+{7.491-(0.00217×298.15)}N_<Or>N^2_<Ab> (Kcal mol^<-1>.).........microcline-lowalbite solid solution series. The values calculated from these equations are shown in Tables 3 and 4. The equation for the calculation of the molar enthalpies (H^0_<298>) at one atmosphere and temperature 298.15°K of the sanidine-high albite solid solution series and the microcline-low albite solid solution series are as follows: (H^0_<298>)=-934.513-9.865N_<Or>,+6.327N^2_<Or>N_<Ab>+7.672N_<Or>N^2_<Ab>) (Kcal mol^<-1>.).........sanidine-high albite solid solution series, (H^0_<298>)=-937.146-9.119N_<Or>,+5.928N^2_<Or>N_<Ab>+8.457N_<Or>N^2_<Ab>) (Kcal mol^<-1>.).........
- 日本地質学会の論文
- 1974-09-30
著者
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富阪 武士
Department Of Mineralogical Sciences And Geology Faculty Of Literature And Science Yamaguchi Univers
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富阪 武士
山口大学文理学部地質学鉱物科学教室