Kinetics of  isothermal phase transition of HMX based on quantitative phase analysis using the Rietveld method

XUE Chao; SUN Jie; SONG Gong-Bao; KANG Bin; XIA Yun-Xia

doi:10.11883/1001-1455(2010)02-0113-06

Volume 30 Issue 2

Nov. 2010

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Article Navigation > Explosion And Shock Waves > 2010 > 30(2): 113-118

XUE Chao, SUN Jie, SONG Gong-Bao, KANG Bin, XIA Yun-Xia. Kinetics of isothermal phase transition of HMX based on quantitative phase analysis using the Rietveld method[J]. Explosion And Shock Waves, 2010, 30(2): 113-118. doi: 10.11883/1001-1455(2010)02-0113-06

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XUE Chao, SUN Jie, SONG Gong-Bao, KANG Bin, XIA Yun-Xia. Kinetics of isothermal phase transition of HMX based on quantitative phase analysis using the Rietveld method[J]. Explosion And Shock Waves, 2010, 30(2): 113-118. doi: 10.11883/1001-1455(2010)02-0113-06

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Kinetics of isothermal phase transition of HMX based on quantitative phase analysis using the Rietveld method

doi: 10.11883/1001-1455(2010)02-0113-06

Publish Date: 2010-03-25

Abstract

Abstract

Based on the quantitative phase analysis using the Rietveld method, in-situ X-ray diffraction (XRD) experiments were conducted to explore isothermal phase transition kinetics of HMX. Transition extent-time curves of HMX were described at different isothermal temperatures, the Avrami exponent n was obtained close to 0.6, and the related isothermal phase transition kinetics equation was developed. The Arrhenius equation was used to quantify the relationship between the rate constant k and the temperature T, the calculated activation energy Ea was about 151 kJ/mol, and the calculated pre-exponential lnA was 36.2. The results show that the experimental temperature is the dominant factor controlling the phase transition of HMX, and phase experiences a similarly one-dimensional nucleation-and-growth mechanism randomly during the phase transition of HMX.
- mechanics of explosion| isothermal phase transition| Rietveld method| HMX,
- in-situ XRD| kinetics,

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国家自然科学基金项目(10979037);;国家重点基础研究发展计划(973计划)项目(61383)

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