Repository logo
  • English
  • 中文
Log In
Have you forgotten your password?
  1. Home
  2. College of Science / 理學院
  3. Geosciences / 地質科學系
  4. Methods and Applications for the Study of the Thermal Decomposition Kinetics of Evaporite Minerals
 
  • Details

Methods and Applications for the Study of the Thermal Decomposition Kinetics of Evaporite Minerals

Date Issued
2007
Date
2007
Author(s)
Lin, Shu-Hong
DOI
zh-TW
URI
http://ntur.lib.ntu.edu.tw//handle/246246/54807
Abstract
ABSTRACT   Kinetic research of minerals has been a very important area in the research of geology. In this research, three kinetic methods ─ Master Curve Model (MCM), Ozawa method and Avrami Equation method ─ have been used to analyze and predict the thermal decomposition reactions of five evaporite minerals.   The research consists of three parts: First is to prepare the five high-purity synthetic evaporite minerals powders, including gypsum, calcite, chalcanthite, nitratine and hydromagnesite, and to verify their phases and purities by XRD. Second is to conduct a series of thermal decomposition experiments of the powders by TGA at various heating rates and isothermal condition. Third is to analyze the weight loss data by the three kinetic methods. The application limitations of MCM, Ozawa method and Avrami Equation on the study of thermal decomposition reactions will be discussed on the basis of the experimental results. From the experimental results, constant heating rate experiments show a significant deviation of the data due to the possible temperature-measuring errors inside the Thermal Gravitometry Analyzer. Fortunately, isothermal experiments can effectively reduce the uncertainty of the data and thus derive adequate results. In this research, MCM demonstrates that it is excellent in the prediction of reaction process. The effect of grain size on reaction rate is shown in this work that smaller grain size samples may lead to a higher reaction rate, as a result of the “surface-area effect.” The final part of this research is to propose a new concept of “geothermometer,” which is based on the modeling of the kinetic reactions, and it may become a powerful tool to find out the possible temperature and time conditions of many geological processes. To sum up, the research contributes in three aspects: First, using three kinetic models to characterize the thermal decomposition reactions and the thermal stability of five evaporate minerals, and most importantly to derive the quantitative relationship of the reaction percentage and the reaction time and temperature. Second, learning the applicability, the limitation and possible error levels of MCM, Ozawa method and Avrami Equation, based on the analysis results. Finally, proposing a new concept of “geothermometer,” and which may be very useful in geologic research. The results of this preliminary study may be extended to other kinetic reactions of various minerals.
Subjects
蒸發岩礦物
熱分解反應
動力學
尺寸效應
地質溫度計
evaporite mineral
thermal decomposition
kinetics
size-effect
geothermometer
Type
thesis
File(s)
Loading...
Thumbnail Image
Name

ntu-96-R92224108-1.pdf

Size

23.53 KB

Format

Adobe PDF

Checksum

(MD5):c0cfecc72b6cb9c764e2dbff26f80f9d

臺大位居世界頂尖大學之列,為永久珍藏及向國際展現本校豐碩的研究成果及學術能量,圖書館整合機構典藏(NTUR)與學術庫(AH)不同功能平台,成為臺大學術典藏NTU scholars。期能整合研究能量、促進交流合作、保存學術產出、推廣研究成果。

To permanently archive and promote researcher profiles and scholarly works, Library integrates the services of “NTU Repository” with “Academic Hub” to form NTU Scholars.

總館學科館員 (Main Library)
醫學圖書館學科館員 (Medical Library)
社會科學院辜振甫紀念圖書館學科館員 (Social Sciences Library)

開放取用是從使用者角度提升資訊取用性的社會運動,應用在學術研究上是透過將研究著作公開供使用者自由取閱,以促進學術傳播及因應期刊訂購費用逐年攀升。同時可加速研究發展、提升研究影響力,NTU Scholars即為本校的開放取用典藏(OA Archive)平台。(點選深入了解OA)

  • 請確認所上傳的全文是原創的內容,若該文件包含部分內容的版權非匯入者所有,或由第三方贊助與合作完成,請確認該版權所有者及第三方同意提供此授權。
    Please represent that the submission is your original work, and that you have the right to grant the rights to upload.
  • 若欲上傳已出版的全文電子檔,可使用Open policy finder網站查詢,以確認出版單位之版權政策。
    Please use Open policy finder to find a summary of permissions that are normally given as part of each publisher's copyright transfer agreement.
  • 網站簡介 (Quickstart Guide)
  • 使用手冊 (Instruction Manual)
  • 線上預約服務 (Booking Service)
  • 方案一:臺灣大學計算機中心帳號登入
    (With C&INC Email Account)
  • 方案二:ORCID帳號登入 (With ORCID)
  • 方案一:定期更新ORCID者,以ID匯入 (Search for identifier (ORCID))
  • 方案二:自行建檔 (Default mode Submission)
  • 方案三:學科館員協助匯入 (Email worklist to subject librarians)

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science