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000637988 1001_ $$0P:(DE-H253)PIP1083715$$aStorm, Christian$$b0$$eCorresponding author
000637988 245__ $$aExperimental signatures of interstitial electron density in transparent dense sodium
000637988 260__ $$aLondon$$bSpringer Nature$$c2025
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000637988 520__ $$aThe transparent hP4 phase of dense sodium (Na), stable above 200 GPa, has been computed to be an electride in which valence electrons are localised on interstitial lattice sites within the structure. However, there is no experimental evidence for this interstitial electron localisation in Na, or indeed in other high-density electride phases. Using static compression and single-crystal X-ray diffraction techniques, we have grown and studied a single-crystal sample of Na in the hP4 phase at 223 GPa. Using atomic form factors for hP4-Na derived from quantum crystallography techniques, we present experimental results to support the electride nature of this phase.
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000637988 7001_ $$0P:(DE-HGF)0$$aRacioppi, Stefano$$b1
000637988 7001_ $$0P:(DE-H253)PIP1094195$$aDuff, Matthew$$b2
000637988 7001_ $$0P:(DE-H253)PIP1090734$$aMcHardy, James$$b3
000637988 7001_ $$0P:(DE-HGF)0$$aZurek, Eva$$b4
000637988 7001_ $$0P:(DE-H253)PIP1015415$$aMcMahon, Malcolm$$b5
000637988 773__ $$0PERI:(DE-600)3008524-X$$a10.1038/s43246-025-00925-w$$gVol. 6, no. 1, p. 201$$n1$$p201$$tCommunications materials$$v6$$x2662-4443$$y2025
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