AI Article Synopsis
- - The study explores how partial substitution of vanadium (V) for titanium (Ti) in the lead-free ferroelectric CaMnTiO enhances spontaneous polarization due to changes in the material's structure.
- - Synchrotron X-ray diffraction revealed that the addition of V increases the polar displacement of the titanium sites, influenced by Jahn-Teller activity related to its electronic configuration.
- - However, at higher V substitution levels, magnetic studies indicated a disorder between calcium (Ca) and manganese (Mn) that reduces spontaneous polarization and lowers the transition temperature between ferroelectric and paraelectric states.
Article Abstract
Spontaneous polarization () of novel order-disorder type lead-free ferroelectric CaMnTiO was successfully enhanced by partial V substitution for Ti. A synchrotron X-ray diffraction study revealed that the polar displacement of octahedrally coordinated (Ti, V) in CaMn(TiV)O (0 ≤ ≤ 0.4) increases with V substitution having Jahn-Teller activity owing to the d electronic configuration. Our magnetic study suggested the presence of antisite disorder between Ca and square planar coordinated Mn associated with Mn-V intermetallic charge transfer for ≥ 0.4, resulting in decreases in spontaneous polarization and the ferroelectric-paraelectric transition temperature. This is the first report on the enhanced polarization owing to the Jahn-Teller distortion of V without stereochemical Pb or Bi.
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| http://dx.doi.org/10.1021/acs.inorgchem.0c01697 | DOI Listing |
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