Potassium- and Lithium-Ammonia Intercalation into Excitonic Insulator Candidate Ta₂NiSe₅.

ABSTRACT: Two new reduced phases derived from the topical excitonic insulator candidate Ta₂NiSe₅ have been synthesized via the intercalation of lithium and potassium from solutions of the metals in liquid ammonia. Li(NH₃)Ta₂NiSe₅ and KTa₂NiSe₅ both crystallize in orthorhombic space group Pmnb with the following lattice parameters: a = 3.5175(1) Å, b = 18.7828(7) Å, and c = 15.7520(3) Å and a = 3.50247(3) Å, b = 13.4053(4) Å, and c = 15.7396(2) Å, respectively. They have increased unit cell volumes of 48% and 31%, respectively, relative to that of Ta₂NiSe₅. Significant rearrangement of the transition metal selenide layers is observed in both intercalates

SUBMITTER: Hyde PA 

PROVIDER: S-EPMC11467832 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature