High pressure synthesis of new oxides and nitrides. Examples of new high-pressure electronic and magnetic materials

10-05-2023 13:30 - 14:15

Miejsce

Audytorium IFPAN

Speaker

Prof. J. Paul Attfield

Affiliation

University of Edinburgh (UK)

Sala

Audytorium IF PAN

Załącznik

attfield-hp-warsaw-2023-abstract-2

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High pressure synthesis of new oxides and nitrides

J. Paul Attfield

Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, UK

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High pressure methods are important for synthesising new materials, and exploring changes of structure and property in dense matter. High pressure materials science will be introduced in the first lecture, and applications for materials chemistry will be illustrated with reference to new oxides and nitrides in lectures 2 and 3. High pressure often stabilises cations in unusual oxidation or coordination environments. Examples are perovskites with Mn²⁺ at A-sites, such as MnVO₃ [1], the double perovskite Mn₂FeReO₆[2] and double double perovskites MnRMnSbO₆ and CaMnFeReO₆with order of A and B site cations [3,4,5]. A remarkable variety of new iron oxides has recently been reported at high pressures, and we have explored the substitutional chemistry of Fe₄O₅. Complex magnetic orders are observed in MnFe₃O₅ [6] and CoFe₃O₅ [7], while CaFe₃O₅ (prepared at ambient pressure) shows electronic phase separation driven by trimeron formation [8]. A new quantum phenomenon, quantised weak ferromagnetism, has recently been discovered in the perovskite YRuO₃ based on the unusual Ru³⁺ state [9]. A high pressure method using sodium azide has recently been developed to synthesise nitrides in high oxidation states giving the iron(IV) nitride, Ca₄FeN₄ [10], an electron-localised Ni²⁺ nitride, Ca₂NiN₂ [11], and a rare example of a nitride perovskite, LaReN₃ 12]. The latter material can be decomposed to give novel reduction products LaReN_2.5 and layered LaReN₂ demonstrating topotactic reduction chemistry analogous to that of perovskite oxides like LaNiO₃ and SrFeO₃.

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The lecture series is financed through the STER program of the National Agency for Academic Exchange (NAWA)

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10-05-2023 13:30 - 14:15