Structure Refinement and Two-Center Luminescence of Ca3La3(BO3)5:Ce3+ under VUV–UV Excitation

Chunmeng Liu; Hongbin Liang; Xiaojun Kuang; Jiuping Zhong; Shuaishuai Sun; Ye Tao

doi:10.1021/ic3006053

Structure Refinement and Two-Center Luminescence of Ca3La3(BO3)5:Ce3+ under VUV–UV Excitation

Inorganic Chemistry ◽

10.1021/ic3006053 ◽

2012 ◽

Vol 51 (16) ◽

pp. 8802-8809 ◽

Cited By ~ 44

Author(s):

Chunmeng Liu ◽

Hongbin Liang ◽

Xiaojun Kuang ◽

Jiuping Zhong ◽

Shuaishuai Sun ◽

...

Keyword(s):

Structure Refinement ◽

Uv Excitation

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Structure refinement and one-center luminescence of Eu3+ activated ZnBi2B2O7 under UV excitation

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2015.06.187 ◽

2015 ◽

Vol 648 ◽

pp. 500-506 ◽

Cited By ~ 8

Author(s):

Liwei Wu ◽

Fangxin Zhang ◽

Li Wu ◽

Huan Yi ◽

Hongrun Wang ◽

...

Keyword(s):

Structure Refinement ◽

Uv Excitation

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ChemInform Abstract: Structure Refinement and One-Center Luminescence of Eu3+Activated ZnBi2B2O7under UV Excitation.

ChemInform ◽

10.1002/chin.201545007 ◽

2015 ◽

Vol 46 (45) ◽

pp. no-no

Author(s):

Liwei Wu ◽

Fangxin Zhang ◽

Li Wu ◽

Huan Yi ◽

Hongrun Wang ◽

...

Keyword(s):

Structure Refinement ◽

Abstract Structure ◽

Uv Excitation

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ChemInform Abstract: Structure Refinement and Two-Center Luminescence of Ca3La3(BO3)5:Ce3+under VUV-UV Excitation.

ChemInform ◽

10.1002/chin.201245005 ◽

2012 ◽

Vol 43 (45) ◽

pp. no-no

Author(s):

Chunmeng Liu ◽

Hongbin Liang ◽

Xiaojun Kuang ◽

Jiuping Zhong ◽

Shuaishuai Sun ◽

...

Keyword(s):

Structure Refinement ◽

Abstract Structure ◽

Uv Excitation

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Quantitative structure determination of interfaces through Z-contrast imaging and electron energy loss spectroscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100162983 ◽

1996 ◽

Vol 54 ◽

pp. 104-105

Author(s):

S. J. Pennycook ◽

P. D. Nellist ◽

N. D. Browning ◽

P. A. Langjahr ◽

M. Rühle

Keyword(s):

Grain Boundaries ◽

Cuprate Superconductors ◽

Structure Refinement ◽

3D Structure ◽

Real Space ◽

Contrast Imaging ◽

Coordination Polyhedra ◽

Burgers Vector ◽

Z Contrast ◽

Contrast Image

The simultaneous use of Z-contrast imaging with parallel detection EELS in the STEM provides a powerful means for determining the atomic structure of grain boundaries. The incoherent Z-contrast image of the high atomic number columns can be directly inverted to their real space arrangement, without the use of preconceived structure models. Positions and intensities may be accurately quantified through a maximum entropy analysis. Light elements that are not visible in the Z-contrast image can be studied through EELS; their coordination polyhedra determined from the spectral fine structure. It even appears feasible to contemplate 3D structure refinement through multiple scattering calculations.The power of this approach is illustrated by the recent study of a series of SrTiC>3 bicrystals, which has provided significant insight into some of the basic issues of grain boundaries in ceramics. Figure 1 shows the structural units deduced from a set of 24°, 36° and 65° symmetric boundaries, and 24° and 45° asymmetric boundaries. It can be seen that apart from unit cells and fragments from the perfect crystal, only three units are needed to construct any arbitrary tilt boundary. For symmetric boundaries, only two units are required, each having the same Burgers, vector of a<100>. Both units are pentagons, on either the Sr or Ti sublattice, and both contain two columns of the other sublattice, imaging in positions too close for the atoms in each column to be coplanar. Each column was therefore assumed to be half full, with the pair forming a single zig-zag column. For asymmetric boundaries, crystal geometry requires two types of dislocations; the additional unit was found to have a Burgers’ vector of a<110>. Such a unit is a larger source of strain, and is especially important to the transport characteristics of cuprate superconductors. These zig-zag columns avoid the problem of like-ion repulsion; they have also been seen in TiO2 and YBa2Cu3O7-x and may be a general feature of ionic materials.

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X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

JOURNAL OF ADVANCES IN CHEMISTRY ◽

10.24297/jac.v12i10.5520 ◽

2013 ◽

Vol 12 (10) ◽

pp. 719-726

Author(s):

R. Ayadi ◽

Mohamed Boujelbene ◽

T. Mhiri

Keyword(s):

Solid State ◽

General Formula ◽

Vibrational Spectroscopy ◽

Powder Diffraction ◽

Infrared Spectra ◽

Solid State Reaction ◽

Structure Refinement ◽

Unit Cell ◽

Cell Group ◽

X Ray

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position. Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.

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