Local structure of lead-containing mixed-ion perovskite ferroelectrics studied using neutron total scattering analysis

2012 ◽  
Vol 61 (1) ◽  
pp. 80-84 ◽  
Author(s):  
I. -K. Jeong ◽  
Dhananjai Pandey
Keyword(s):  
Local Structure ◽  
Total Scattering ◽  
Neutron Total Scattering

Total scattering studies of silica polymorphs: similarities in glass and disordered crystalline local structure

2000 ◽  
Vol 64 (3) ◽  
pp. 447-457 ◽  
Author(s):  
D. A. Keen ◽  
M. T. Dove
Keyword(s):  
Local Structure ◽  
Glass Structure ◽  
Quantitative Comparison ◽  
Crystalline Phases ◽  
Total Scattering ◽  
Disordered Structure ◽  
Scattering Measurements ◽  
Crystalline Forms ◽  
Short Range Correlations ◽  
Neutron Total Scattering

AbstractThe structure of amorphous silica has frequently been compared with its crystalline counterparts in an attempt to understand the glass structure beyond short-range correlations. This paper presents results from neutron total scattering measurements of several polymorphs of silica and shows how these can be used to make a direct, quantitative comparison of amorphous and crystalline forms. It is found that the glass is similar to HP-tridymite and β-cristobalite, both dynamically-disordered crystalline phases of silica, but only out to distances ∼7.5 Å, beyond which the structures diverge. This is too small to validate a microcrystallite theory of glass structure. It is the average 180° Si–O–Si linkage in these two crystalline phases which gives them the flexibility for their instantaneous disordered structure to resemble the quenched (static) glass structure.

scholarly journals The local structure of ice VII determined by neutron total scattering

2005 ◽  
Vol 61 (a1) ◽  
pp. c94-c94 ◽  
Author(s):  
M. Guthrie ◽  
C. L. Bull ◽  
R. J. Nelmes ◽  
J. S. Loveday ◽  
T. Strässle ◽  
...  
Keyword(s):  
Local Structure ◽  
Total Scattering ◽  
Neutron Total Scattering

Local structure in ZrW2O8from neutron total scattering

2007 ◽  
Vol 19 (33) ◽  
pp. 335215 ◽  
Author(s):  
Matthew G Tucker ◽  
David A Keen ◽  
John S O Evans ◽  
Martin T Dove
Keyword(s):  
Local Structure ◽  
Total Scattering ◽  
Neutron Total Scattering

scholarly journals A Structural Study of 0.06LiNbO3-0.94K0.5Na0.5NbO3 from Neutron Total Scattering Analysis

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 395
Author(s):  
J. Kong ◽  
J. Liu ◽  
F. Marlton ◽  
M. R. V. Jørgensen ◽  
A. Pramanick
Keyword(s):  
Local Structure ◽  
Rietveld Analysis ◽  
Scattering Method ◽  
Two Phase ◽  
Total Scattering ◽  
Temperature Range ◽  
Oxygen Octahedral Distortion ◽  
Powder Neutron Diffraction Data ◽  
Neutron Total Scattering

The structure of ferroelectric 0.06LiNbO3-0.94K0.5Na0.5NbO3 (KNNL6) was investigated by the neutron total scattering method in the temperature range of 290–773 K. The Rietveld analysis using the powder neutron diffraction data in the range of 290–773 K indicates transition from a two-phase (monoclinic and tetragonal) mixture at room temperature to tetragonal and cubic phases at higher temperatures. However, characterization of the local structure by the pair distribution function (PDF) method indicates that the local structure (r ≲ 10 Å) stays monoclinic over the same temperature range. Besides, the local oxygen octahedral distortion exhibits smaller changes with temperature than what is observed for the long-range average structure.

The Ba3Mo1−xWxNbO8.5 ion conductors: insights into local coordination from X-ray and neutron total scattering

2020 ◽  
Vol 8 (40) ◽  
pp. 21227-21240
Author(s):  
Mauro Coduri ◽  
Andrea Bernasconi ◽  
Henry E. Fischer ◽  
Lorenzo Malavasi
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Local Structure ◽  
Total Scattering ◽  
X Ray ◽  
Local Coordination ◽  
Octahedral Sites ◽  
Neutron Total Scattering ◽  
Ion Conductors

The local structure of Ba3Mo1−xWxNbO8.5 is consistent with a mixture of regions richer in tetrahedral and octahedral sites, which redistribute at high temperature after a reconstructive phase transition.

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