Thermal expansion of andalusite and sillimanite at ambient pressure: a powder X-ray diffraction study up to 1000°C

被引：26

作者：

Hu, X. ^{[1
,2
]}

Liu, X. ^{[1
,2
]}

He, Q. ^{[1
,2
]}

Wang, H. ^{[1
,2
]}

Qin, S. ^{[1
,2
]}

Ren, L. ^{[3
]}

Wu, C. M. ^{[4
]}

Chang, L. ^{[1
,2
]}

机构：

[1] Minist Educ China, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China

[2] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China

[3] Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China

[4] Chinese Acad Sci, Grad Sch, Coll Earth Sci, Beijing 100049, Peoples R China

来源：

MINERALOGICAL MAGAZINE | 2011年 / 75卷 / 02期

关键词：

andalusite; high temperature; powder X-ray diffraction; sillimanite; thermal expansion; CRYSTAL-STRUCTURE; AL2SIO5; POLYMORPHS; PHASE-DIAGRAM; KYANITE; COMPRESSIBILITY; DECOMPOSITION; BEHAVIOR; TEMPERATURE; STISHOVITE; SYSTEM;

D O I：

10.1180/minmag.2011.075.2.363

中图分类号：

P57 [矿物学];

学科分类号：

070901 ;

摘要：

The unit-cell parameters of andalusite and sillimanite have been measured by high-T powder X-ray diffraction up to 1000 degrees C at ambient pressure. Within the temperature range investigated, all the unit-cell parameters varied smoothly, indicating no phase transition. The volume-temperature data were fitted with a polynomial expression for the thermal expansion coefficient (alpha(T) = a(0) + a(1)T + a(2)T(-2)), yielding a(0) = 2.55(2) x 10(-5) K(-1), a(1) = 0 and a(2) = 0 for andalusite, and a(0) = 1.40(4) x 10(-5)K(-1), a(1) = 7.1(8) x 10(-9)K(-2) and a(2) = 0 for sillimanite. Using the new thermal expansion data determined in the present study and compressional data from the literature, the P-T phase relations of the kyanite-andalusite-sillimanite system were calculated thermodynamically, with the invariant point located at similar to 523 degrees C and 3.93 kbar.

引用

页码：363 / 374

页数：12

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