Using applied pressure to guide materials design: A neutron diffraction study of La2NiO4+: δ and Pr2NiO4+ δ

Craig L. Bull; Christopher J. Ridley; Helen Y. Playford

doi:10.1039/d0dt02155e

Using applied pressure to guide materials design: A neutron diffraction study of La₂NiO_{4+: δ}and Pr₂NiO_{4+ δ}

Craig L. Bull, Christopher J. Ridley, Helen Y. Playford

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3 Scopus citations

Abstract

The compression behaviours of La2NiO4+δ and Pr2NiO4+δ have been studied up to a pressure of 2.8 and 2.2 GPa respectively. Using neutron diffraction, the mechanism of compression, and the behaviour of the NiO6 and La/PrO9 polyhedra in these layered perovskite materials have been determined. Their compression mechanisms have then been compared to related materials (La2-xPrxNiO4, Pr2-xNdxNiO4, La2-xSrxNiO4 and Pr2-xCaxNiO4) where the unit-cell volume has been reduced by controlling the composition (x), which acts as an 'effective chemical pressure'. Understanding the effects of both has implications for materials design; pressure can be used to finely tune a property, which theoretically may then be emulated using chemical doping.

Original language	English
Pages (from-to)	10631-10637
Number of pages	7
Journal	Dalton Transactions
Volume	49
Issue number	30
DOIs	https://doi.org/10.1039/d0dt02155e
State	Published - Aug 14 2020
Externally published	Yes

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title = "Using applied pressure to guide materials design: A neutron diffraction study of La2NiO4+: δ and Pr2NiO4+ δ ",

abstract = "The compression behaviours of La2NiO4+δ and Pr2NiO4+δ have been studied up to a pressure of 2.8 and 2.2 GPa respectively. Using neutron diffraction, the mechanism of compression, and the behaviour of the NiO6 and La/PrO9 polyhedra in these layered perovskite materials have been determined. Their compression mechanisms have then been compared to related materials (La2-xPrxNiO4, Pr2-xNdxNiO4, La2-xSrxNiO4 and Pr2-xCaxNiO4) where the unit-cell volume has been reduced by controlling the composition (x), which acts as an 'effective chemical pressure'. Understanding the effects of both has implications for materials design; pressure can be used to finely tune a property, which theoretically may then be emulated using chemical doping.",

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AB - The compression behaviours of La2NiO4+δ and Pr2NiO4+δ have been studied up to a pressure of 2.8 and 2.2 GPa respectively. Using neutron diffraction, the mechanism of compression, and the behaviour of the NiO6 and La/PrO9 polyhedra in these layered perovskite materials have been determined. Their compression mechanisms have then been compared to related materials (La2-xPrxNiO4, Pr2-xNdxNiO4, La2-xSrxNiO4 and Pr2-xCaxNiO4) where the unit-cell volume has been reduced by controlling the composition (x), which acts as an 'effective chemical pressure'. Understanding the effects of both has implications for materials design; pressure can be used to finely tune a property, which theoretically may then be emulated using chemical doping.

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Using applied pressure to guide materials design: A neutron diffraction study of La₂NiO_{4+: δ}and Pr₂NiO_{4+ δ}

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