收稿日期: 2014-02-28
修回日期: 2014-03-31
网络出版日期: 2015-01-15
基金资助
中国科学院、国家外专局创新团队国际合作伙伴计划(KZZD-EW-TZ-19)和国家自然科学基金(41074063,41374095,41373060)资助
Experimental study on thermal decomposition kinetics of talc under the condition of air atmosphere
Received date: 2014-02-28
Revised date: 2014-03-31
Online published: 2015-01-15
王艳 , 王多君 , 易丽 . 空气气氛中滑石的热分解动力学实验研究[J]. 中国科学院大学学报, 2015 , 32(1) : 70 -73 . DOI: 10.7523/j.issn.2095-6134.2015.01.012
Study on thermal decomposition kinetics of hydrous minerals is important to the exploration of the formation mechanisms of intermediate-deep earthquakes occurred in subduction zone. In the present work thermal decomposition of talc was studied by using thermogravimetric (TG) techniques under the condition of dynamical air atmosphere. The model-free methods including Friedman and FWO were employed to determine the activation energy (Ea) and the pre-exponential factor (A). Based on the initial values derived from Friedman method, the most probable kinetic model of the dehydration reaction was obtained by using the multivariate non-linear regression approach. The results showed that talc decomposed in the temperature range of 830~1 050℃ and the most probable kinetic model could be expressed as f(α)=(1-α)n and G(α)=(1-(1-α)(1-n))/(1-n), with the derived values of 1.7,344.2 kJ/mol, and 4.9E12 s-1 for n, Ea, and A, respectively.
Key words： talc; dehydration kinetics; thermogravimetric
[1] Frohlich C. The nature of deep-focus earthquakes[J]. Annual Review of Earth and Planetary Sciences, 1989, 17: 227.
[2] Green H W, Houston H. The mechanics of deep earthquakes[J]. Annual Review of Earth and Planetary Sciences, 1995, 23: 169-214.
[3] Hasegawa A, Umino N, Takagi A. Double-planed deep seismic zone and upper-mantle structure in the Northeastern Japan Arc[J]. Geophysical Journal of the Royal Astronomical Society,1978,54(2): 281-296.
[4] Hacker B R, Peacock S M, Abers G A, et al.Subduction factory 2. Are intermediate-depth earthquakes in subducting slabs linked to metamorphic dehydration reactions?[J]. Journal of Geophysical Research: Solid Earth (1978-2012),2003,108(B1):ESE 11-1 to ESE 11-15.
[5] Brudzinski M R, Thurber C H, Hacker B R, et al. Global prevalence of double Benioff zones[J]. Science,2007,316(5 830): 1 472-1 474.
[6] Yamasaki T, Seno T. Double seismic zone and dehydration embrittlement of the subducting slab[J]. Journal of Geophysical Research: Solid Earth (1978-2012),2003,108(B4): ESE 9-1 to ESE 9-21.
[7] Perrillat J P, Daniel I, Koga K T, et al.Kinetics of antigorite dehydration: a real-time X-ray diffraction study[J]. Earth and Planetary Science Letters,2005,236(3): 899-913.
[8] Schmidt M W, Poli S. Experimentally based water budgets for dehydrating slabs and consequences for arc magma generation[J]. Earth and Planetary Science Letters, 1998, 163(1): 361-379.
[9] 胡荣祖, 史启祯. 热分析动力学[M]. 北京: 科学出版社, 2001:127-131.
[10] 关春秀, 陈栋华. 一水合草酸铵脱水的热分析动力学[J]. 中南民族大学学报:自然科学版, 2004, 23 (1): 14-17.
[11] Wang D J, Karato S.Electrical conductivity of talc aggregates at 0.5 GPa: influence of dehydration[J]. Physics and Chemistry of Minerals,2013,40(1): 11-17.
[12] Zhan D, Cong C J, Diakite K, et al.Kinetics of thermal decomposition of nickel oxalate dihydrate in air[J]. Thermochimica Acta, 2005, 430(1): 101-105.
[13] Hong J H, Guo G H, Zhang K L. Kinetics and mechanism of non-isothermal dehydration of nickel acetate tetrahydrate in air[J]. Journal of Analytical and Applied Pyrolysis, 2006, 77(2): 111-115.
[14] Bose K, Ganguly J. Thermogr-avimetric study of the dehydration kinetics of talc[J]. American Mineralogist,1994,79(7/8): 692-699.
/
| 〈 |
|
〉 |
