Sodium bismuth titanate: Difference between revisions
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==Structure== |
==Structure== |
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{{main|Perovskite (structure)}} |
{{main|Perovskite (structure)}} |
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The exact room-temperature crystal structure of sodium bismuth titanate has been a matter of debate for several years. The early studies in the 1960s using [[X-ray diffraction]] suggested sodium bismuth titanate to adopt either pseudo-cubic or [[rhombohedral]] symmetry. In 2010, based on the high-resolution single-crystal [[X-ray diffraction]] data, a [[monoclinic]] structure was proposed.On heating, Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> adopts |
The exact room-temperature crystal structure of sodium bismuth titanate has been a matter of debate for several years. The early studies in the 1960s using [[X-ray diffraction]] suggested sodium bismuth titanate to adopt either pseudo-cubic or [[rhombohedral]] symmetry. In 2010, based on the high-resolution single-crystal [[X-ray diffraction]] data, a [[monoclinic]] structure was proposed.On heating, Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> adopts [[tetragonal]] symmetry (space group P4bm) at ~250 °C and cubic symmetry (space group Pm3¯m) above ~520 °C. |
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==Applications== |
==Applications== |
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Revision as of 13:11, 2 January 2016
Sodium bismuth titanate or bismuth sodium titanium oxide is a solid inorganic compound of sodium, bismuth, titanium and oxygen with the chemical formula of Na0.5Bi0.5TiO3 or Bi0.5Na0.5TiO3. This compound adopts the Perovskite structure.
Synthesis
Na0.5Bi0.5TiO3 is not a naturally occurring mineral and several synthesis routes to obtain the compound have been developed. It can be easily prepared by solid state reaction between CaCO3, Bi2O3 and TiO2 at temperatures around 850 °C.
Structure
The exact room-temperature crystal structure of sodium bismuth titanate has been a matter of debate for several years. The early studies in the 1960s using X-ray diffraction suggested sodium bismuth titanate to adopt either pseudo-cubic or rhombohedral symmetry. In 2010, based on the high-resolution single-crystal X-ray diffraction data, a monoclinic structure was proposed.On heating, Na0.5Bi0.5TiO3 adopts tetragonal symmetry (space group P4bm) at ~250 °C and cubic symmetry (space group Pm3¯m) above ~520 °C.
Applications
The extraordinarily large strain generated by a field-induced phase transition in sodium bismuth titanate-based solid solutions prompted researchers to investigate its potential as an alternative to lead zirconate titanate for actuator applications.