AI Article Synopsis
- Two mechanisms for doping Li(3)NbO(4) have been identified: the stoichiometric mechanism, where nickel substitutes for lithium and niobium while maintaining a 1:1 cation-to-anion ratio, and the vacancy mechanism, which involves creating lithium vacancies through nickel substitution.
- Solid solution ranges have been determined for both mechanisms, and a phase diagram has been created for the stoichiometric join; powder neutron diffraction confirmed the mechanism for the vacancy join.
- Notably, as nickel content increases, lithium ion conductivity dramatically improves, achieving a high value at 300°C, making this one of the first instances of significant lithium conductivity in complex oxides with a rock salt structure.
Article Abstract
Two mechanisms of doping Li(3)NbO(4), which has an ordered, rock salt superstructure, have been established. In the "stoichiometric mechanism", the overall cation-to-anion ratio is maintained at 1:1 by means of the substitution 3Li(+) + Nb(5+) --> 4Ni(2+). In the "vacancy mechanism", Li(+) ion vacancies are created by means of the substitution 2Li(+) --> Ni(2+). Solid solution ranges have been determined for both mechanisms and a partial phase diagram constructed for the stoichiometric join. On the vacancy join, the substitution mechanism has been confirmed by powder neutron diffraction; associated with lithium vacancy creation, a dramatic increase in Li(+) ion conductivity occurs with increasing Ni content, reaching a value of 5 x 10(-4) Omega(-1) cm(-1) at 300 degrees C for composition x= 0.1 in the formula Li(3-2x)Ni(x)NbO(4). This is the first example of high Li(+) ion conductivity in complex oxides with rock salt-related structures.
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| http://dx.doi.org/10.1039/b316396m | DOI Listing |
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