Medium-Range Order in Sol-Gel Prepared Al2O3-SiO2 Glasses: New Results from Solid-State NMR

CORC > 上海光学精密机械研究所 > 中国科学院上海光学精密机械研究所 > 中科院强激光材料重点实验室

	Medium-Range Order in Sol-Gel Prepared Al2O3-SiO2 Glasses: New Results from Solid-State NMR
	Ren, Jinjun ; Zhang, Long ; Eckert, Hellmut
刊名	j. phys. chem. c
	2014
卷号	118 期号:9 页码:4906
关键词	MOLECULAR-SIEVE MCM-41 SI-29 MAS-NMR NUCLEAR-MAGNETIC-RESONANCE ANGLE-SPINNING NMR RARE-EARTH ALUMINOSILICATE GELS QUADRUPOLAR NUCLEI FRAMEWORK ALUMINUM SIO2-AL2O3 GLASSES AL-27 NMR
通讯作者	eckert, h (reprint author), univ munster, inst phys chem, corrensstr 30, d-48149 munster, germany.
英文摘要	the medium-range order of 0.5al(2)o(3)-xsio(2) glasses (1 <= x <= 6) prepared via a new sol-gel route from the al lactate precursor has been studied by si-29 and al-27 single- and double-resonance solid-state nmr techniques. for high-alumina samples si-o-al connectivities are detected by si-29 mas nmr as well as by si-29{al-27} rotational echo adiabatic passage double-resonance (reapdor) spectroscopy. to boost the signal-to-noise ratio, the reapdor experiment was combined with a carr-purcell-meiboom-gill (cpmg) echo train acquisition. while all five silicon units q(mal)((4)) (0 <= m <= 4) are detectable in appreciable concentrations for x = 1, the spectra indicate that the average number of al species bound to silicon, (m(al)), gradually decreases toward higher x values, as expected. the al-27 mas nmr spectra reveal four-, five-, and six-coordinated aluminum in these glasses. for x >= 3, the al species detected are essentially independent of sample composition indicating a constant structural environment of al. in contrast, for x = 1 and 2, an increase in the al-27 isotropic chemical shifts suggests an increasing number of al.. al proximities. consistent with this finding, two-dimensional al-27-al-27 double-quantum/single-quantum correlation spectroscopy reveals spatial proximities among and between all types of aluminum species present. on the basis of the complementary evidence from these single- and double-resonance experiments, a model for the medium-range order of these glasses is developed.
收录类别	SCI
语种	英语
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.siom.ac.cn/handle/181231/13143]
专题	上海光学精密机械研究所_中科院强激光材料重点实验室
作者单位	1.[Ren, Jinjun 2.Eckert, Hellmut] Univ Munster, Inst Phys Chem, D-48149 Munster, Germany 3.[Zhang, Long] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China 4.[Eckert, Hellmut] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13590 Sao Car
推荐引用方式 GB/T 7714	Ren, Jinjun,Zhang, Long,Eckert, Hellmut. Medium-Range Order in Sol-Gel Prepared Al2O3-SiO2 Glasses: New Results from Solid-State NMR[J]. j. phys. chem. c,2014,118(9):4906.
APA	Ren, Jinjun,Zhang, Long,&Eckert, Hellmut.(2014).Medium-Range Order in Sol-Gel Prepared Al2O3-SiO2 Glasses: New Results from Solid-State NMR.j. phys. chem. c,118(9),4906.
MLA	Ren, Jinjun,et al."Medium-Range Order in Sol-Gel Prepared Al2O3-SiO2 Glasses: New Results from Solid-State NMR".j. phys. chem. c 118.9(2014):4906.