Raman and NMR spectroscopic characterization of high-pressure K-cymrite   (KAlSi3O8 center dot H2O) and its anhydrous form (kokchetavite)

doi:10.2465/jmps.111020i

CORC > 北京大学 > 地球与空间科学学院

	Raman and NMR spectroscopic characterization of high-pressure K-cymrite (KAlSi3O8 center dot H2O) and its anhydrous form (kokchetavite)
	Kanzaki, Masami ; Xue, Xianyu ; Amalberti, Julien ; Zhang, Qian
刊名	journal of mineralogical and petrological sciences
	2012
关键词	K-cymrite Kokchetavite Raman NMR High pressure KAlSi3O8 center dot H2O POTASSIUM-FELDSPAR STABILITY TEMPERATURES DIFFRACTION BREAKDOWN WATER
DOI	10.2465/jmps.111020i
英文摘要	To facilitate identification of high-pressure K-cymrite (KAlSi3O8 center dot H2O) phase and its anhydrous form (kokchetavite) in natural rocks, we have synthesized both phases and have characterized them by micro-Raman and NMR spectroscopy. K-cymrite was synthesized at 5 GPa and 800 degrees C. Kokchetavite was obtained by dehydrating K-cymrite at ambient pressure and 550 degrees C. The H-1 MAS and H-1-Si-29 CP MAS NMR spectra of K-cymrite are consistent with the reported crystal structure that contains H2O molecules and has a disordered Si-Al distribution. The Raman spectra obtained under ambient conditions for K-cymrite (and kokchetavite) contain major peaks at 114.0 (109.1), 380.2 (390.0) and 832.5 (835.8) cm(-1). For K-cymrite, OH stretching vibration is also observed at 3541 cm(-1) with a shoulder at 3623 cm(-1). The Raman spectrum for kokchetavite is consistent with that previously reported for a natural sample found as inclusions in clinopyroxenes and garnets in a garnet-pyroxene rock. However, the data for K-cymrite are inconsistent with the Raman features of a previously reported "relict K-cymrite in K-feldspar" from an eclogite. Pressure- and temperature-dependencies of the Raman shifts for the strongest peak of both phases are also reported.; Mineralogy; SCI(E); 0; ARTICLE; 2; 114-119; 107
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/393493]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Kanzaki, Masami,Xue, Xianyu,Amalberti, Julien,et al. Raman and NMR spectroscopic characterization of high-pressure K-cymrite (KAlSi3O8 center dot H2O) and its anhydrous form (kokchetavite)[J]. journal of mineralogical and petrological sciences,2012.
APA	Kanzaki, Masami,Xue, Xianyu,Amalberti, Julien,&Zhang, Qian.(2012).Raman and NMR spectroscopic characterization of high-pressure K-cymrite (KAlSi3O8 center dot H2O) and its anhydrous form (kokchetavite).journal of mineralogical and petrological sciences.
MLA	Kanzaki, Masami,et al."Raman and NMR spectroscopic characterization of high-pressure K-cymrite (KAlSi3O8 center dot H2O) and its anhydrous form (kokchetavite)".journal of mineralogical and petrological sciences (2012).