Temperature-dependent crystal structure analysis of methyl iodide by high-resolution neutron powder diffraction

2007 ◽  
Vol 222 (8) ◽  
Author(s):  
Richard M. Ibberson ◽  
Michael Prager
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Structure Analysis ◽  
Methyl Iodide ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
Crystal Structure Analysis ◽  
Temperature Dependent

Crystal structure analysis and evidence of mixed anion coordination at the Ce3+ site in Y3Al2(Al,Si)3(O,N)12 oxynitride garnet phosphor

2019 ◽  
Vol 7 (5) ◽  
pp. 1330-1336 ◽  
Author(s):  
Kazuki Asami ◽  
Masahiro Shiraiwa ◽  
Jumpei Ueda ◽  
Kotaro Fujii ◽  
Kenta Hongo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
Crystal Structure Analysis ◽  
Luminescence Properties ◽  
Spectroscopic Measurements ◽  
Anion Coordination

The structural and luminescence properties of Ce3+-doped Y3Al2(Al,Si)3(O,N)12 garnet phosphor have been investigated by neutron powder diffraction and spectroscopic measurements, respectively.

Performance of a new furnace for high-resolution synchrotron powder diffraction up to 1900 K: application to determine electron density distribution of the cubic CaTiO3perovskite at 1674 K

2004 ◽  
Vol 37 (5) ◽  
pp. 786-790 ◽  
Author(s):  
Masatomo Yashima ◽  
Masahiko Tanaka
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Density Distribution ◽  
Electron Density ◽  
Structure Analysis ◽  
High Temperatures ◽  
Powder Diffraction ◽  
Electron Density Distribution ◽  
Crystal Structure Analysis ◽  
Synchrotron Powder Diffraction

Accurate crystal structure analysis at high temperatures is an important challenge in science and technology. A new electric furnace for the measurement of high-resolution (δd/d= 0.03%) synchrotron radiation powder diffraction profiles from materials at high temperatures (up to 1900 K in air) has been designed and fabricated. This furnace consists of a ceramic refractory with MoSi2heaters, an aluminium body cooled by flowing water, and a sample stage with a spinner and a controller for sample-height adjustment.In situsynchrotron powder diffraction measurement for a calcium titanate perovskite specimen at 1674 K has been performed using the furnace at beamline 3A of the Photon Factory. The electron density distribution of the cubic perovskite at 1674 K was successfully obtained using a combination of Rietveld refinement, the maximum-entropy method (MEM) and MEM-based pattern-fitting techniques. The Ti atoms exhibit covalent bonding with the O atoms in the cubic CaTiO3perovskite at this temperature, while the Ca atoms are ionic. These results indicate that the new furnace yields high-quality data for accurate crystal structure analysis.

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