Phase transitions and thermal expansion of BaCO3 and SrCO3 up to 1413K

doi:10.1127/ejm/2017/0029-2612

CORC > 北京大学 > 地球与空间科学学院

	Phase transitions and thermal expansion of BaCO3 and SrCO3 up to 1413K
	Nie, Shufang ; Liu, Yang ; Liu, Qiong ; Wang, Meili ; Wang, Hejin
刊名	EUROPEAN JOURNAL OF MINERALOGY
	2017
关键词	BaCO3 SrCO3 high temperature X-ray diffraction phase transition thermal expansion carbonates. X-RAY-DIFFRACTION HIGH-PRESSURE PHASES STRONTIUM CARBONATE CRYSTAL-STRUCTURES LOWER MANTLE INTERATOMIC DISTANCES DIAMOND FORMATION IN-SITU ARAGONITE TEMPERATURE
DOI	10.1127/ejm/2017/0029-2612
英文摘要	The phase evolution and thermal expansivity of synthetic orthorhombic BaCO3 (alpha-BaCO3) and SrCO3 (alpha-SrCO3) were studied up to 1413K using high-temperature powder X-ray diffraction. The alpha-BaCO3 phase transformed into a trigonal b phase at 1073-1093K with an increase in molar volume by 2.7%, and further to a cubic g phase at 1233-1253K with 0.2% increase in molar volume. The alpha-SrCO3 phase transformed into a trigonal b phase at similar to 1173 K. The fitted parameters for volume thermal expansion coefficients (a(V)(T) = a(0) (10(-5)K(-1)) +a(1)(10(-8)K(-2)) T) are a(0) = 4.0(4), a(1) = 4.0(6) for alpha-SrCO3; a(0) = 4.4(5), a(1) = 3.9(7) for alpha-BaCO3; a0 = 6.5(2) and a(0) = 6.8(1) for the b and g phase of BaCO3, respectively. The beta-BaCO3 phase exhibits negative expansion along the aaxis, which may help to design new materials with tunable thermal behavior when it is mixed with materials with positive thermal expansion. The aragonite-group carbonates (CaCO3, SrCO3, and BaCO3) have similar bulk thermal expansivity, but their anisotropy and linear expansivities vary with the size of the cation.; National Natural Science Foundation of China [41020134003, 40972028, 41520104004]; SCI(E); ARTICLE; 3; 433-443; 29
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/472940]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Nie, Shufang,Liu, Yang,Liu, Qiong,et al. Phase transitions and thermal expansion of BaCO3 and SrCO3 up to 1413K[J]. EUROPEAN JOURNAL OF MINERALOGY,2017.
APA	Nie, Shufang,Liu, Yang,Liu, Qiong,Wang, Meili,&Wang, Hejin.(2017).Phase transitions and thermal expansion of BaCO3 and SrCO3 up to 1413K.EUROPEAN JOURNAL OF MINERALOGY.
MLA	Nie, Shufang,et al."Phase transitions and thermal expansion of BaCO3 and SrCO3 up to 1413K".EUROPEAN JOURNAL OF MINERALOGY (2017).