The enthalpy of formation of natural siderophyllite |
| |
| Authors: | L P Ogorodova L V Mel’chakova I A Kiseleva T N Shuriga O V Kononov |
| |
| Institution: | (1) Faculty of Geology, Moscow State University, Leninskie gory, Moscow, Russia;(2) Fedorovskii All-Russia Institute of Mineral Resources (VIMS), Staromonetnyi per. 29, Moscow, 109017, Russia |
| |
| Abstract: | A thermochemical study of lithium siderophyllite (K0.75Na0.06Rb0.01Ca0.11)(Li0.11Fe 1.25 2+ Mn0.02Mg0.66Al0.35Fe 0.23 3+ Ti0.18)Si2.53Al1.47O10](OH)1.63F0.37 (I) and siderophyllite (Al-Fe biotite) (K0.89Na0.04)(Fe 1.69 2+ Mn0.03Mg0.20Al0.59Fe 0.14 3+ Ti0.06)Si2.80Al1.20O10](OH)0.80F1.16Cl0.04(II) was performed on a high-temperature Tian-Calvet microcalorimeter. Their enthalpies of formation from the elements, Δf H el ° (298.15 K) = ?5724 ± 12 (I) and ?5573 ± 14 (II) kJ/mol, were determined by melt solution calorimetry. The Δf G el ° (298.15 K) = ?5359 ± 12 (I) and ?5231 ± 14 (II) kJ/mol values were calculated. An increase in the content of iron in siderophyllite increased the entropy, enthalpy, and free energy of formation from the elements. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
