On the Electride Nature of Na‐hP4

Author:

Racioppi Stefano1ORCID,Storm Christian V.2ORCID,McMahon Malcolm I.2ORCID,Zurek Eva1ORCID

Affiliation:

1. Department of Chemistry State University of New York at Buffalo (USA) 777 Natural Science Complex 14260-3000 Buffalo, NY USA

2. SUPA School of Physics and Astronomy, and Center for Science at Extreme Conditions The University of Edinburgh Peter Guthrie Tait Road Edinburgh EH9 3FD United Kingdom

Abstract

AbstractEarly quantum mechanical models suggested that pressure drives solids towards free‐electron metal behavior where the ions are locked into simple close‐packed structures. The prediction and subsequent discovery of high‐pressure electrides (HPEs), compounds assuming open structures where the valence electrons are localized in interstitial voids, required a paradigm shift. Our quantum chemical calculations on the iconic insulating Na‐hP4 HPE show that increasing density causes a 3s→3pd electronic transition due to Pauli repulsion between the 1s2s and 3s states, and orthogonality of the 3pd states to the core. The large lobes of the resulting Na‐pd hybrid orbitals point towards the center of an 11‐membered penta‐capped trigonal prism and overlap constructively, forming multicentered bonds, which are responsible for the emergence of the interstitial charge localization in Na‐hP4. These multicentered bonds facilitate the increased density of this phase, which is key for its stabilization under pressure.

Funder

National Science Foundation

Engineering and Physical Sciences Research Council

Publisher

Wiley

Subject

General Chemistry,Catalysis

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