Hydrothermal Synthesis and Luminescence of Eu-Doped Ba0.92Y2.15F8.29 Submicrospheres

The nonstoichimetric Ba0.92Y2.15F8.29 submicrospheres that piled up by nanoparticles have been prepared via a solution-based method in a hydrothermal environment. The size distribution of the submicrospheres could be tuned by varying the amount of BaCl2. The fluoride source NaBF4 plays an important role in the formation of the submicrospheres. The chelator ethylenediaminetetraacetic acid regulates the growth of the primary nanoparticles as well as the aggregated submicrospheres. The photoluminescence properties of different concentrations of Eu3+-doped Ba0.92Y2.15F8.29 were investigated and the results revealed that the 8% concentration of Eu3+ ions is the optimum doping concentration and the Y3+ ions occupy the site of inversion symmetry.

用~(29)Si固体核磁共振方法研究M—ZSM-5分子筛

杂原子ZSM-5分子筛对某些特定的催化反应具有很高的活性和选择性,因而杂原子在分子筛中的存在状态成为人们十分关注的问题,作者曾用许多结构研究方法对杂原子ZSM-5分子筛进行了表征。本文用~(29)Si MAS NMR方法研究了M-ZSM-5 (M=Ga、B、Zn、Ni)分子筛杂原子的存在状态。

PRINCIPAIS INDICADORES: AGRÍCOLAS, v. 3, n. 29, 2010.

2010

PRINCIPAIS INDICADORES: LEITE E DERIVADOS, v. 3, n. 29, 2010.

2010

PRINCIPAIS INDICADORES: MACROECONÔMICOS, v. 3, n. 29, 2010.

2010

LOCALIZED ENHANCEMENTS OF Fe+10 DENSITY IN THE CORONA AS OBSERVED IN Fe xi 789.2 nm DURING THE 2006 MARCH 29 TOTAL SOLAR ECLIPSE

Habbal, Shadia Rifai; Morgan, Huw; Johnson, Judd; Arndt, Martina Belz; Daw, Adrian; Jaeggli, Sarah; Kuhn, Jeff; Mickey, Don, LOCALIZED ENHANCEMENTS OF Fe+10 DENSITY IN THE CORONA AS OBSERVED IN Fe xi 789.2 nm DURING THE 2006 MARCH 29 TOTAL SOLAR ECLIPSE, The Astrophysical Journal, Volume 663, Issue 1, pp. 598-609

Na-23, Si-29, and C-13 MAS NMR investigation of glass-forming reactions between Na2CO3 and SiO2

Winter, Rudolf; Jones, A.R.; Greaves, G.N.; Smith, I.H., (2005) 'Na-23, Si-29, and C-13 MAS NMR investigation of glass-forming reactions between Na2CO3 and SiO2', Journal of Physical Chemistry B 109(49) pp.23154-23161 RAE2008

Informe final de talleres sobre transferencia de tecnología para el aprovechamiento de la fibra de coco, desarrollo en las ciudades de Santa Marta y Cartagena de Indias entre el 18 y el 29 de septiembre de 2006, informe final.

[58] hojas : ilustraciones, fotografías.

Papers presented at conference on the situation in China : under the auspices of the Committee of Reference and Counsel, representing the Foreign Missions Conference of North America : February 29, 1912, 156 Fifth Avenue, New York City.

http://www.archive.org/details/paperspresenteda00foreuoft

Letter to Gershom Cox, dated January 29, 1844

This is a letter from Phoebe Palmer and her husband written on January 29, 1844 to Gershom Cox.