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Pressure-induced metallization and 3d-like behavior in TcS ₂

https://doi.org/10.1039/d2cc01676a

Sayre, Dean; Siska, Emily; Smith, G. Alexander; Chang, Nicholas; Park, Changyong; Poineau, Frederic; Schwartz, Craig P.; Lawler, Keith V.; Salamat, Ashkan (June 2022, Chemical Communications)

TcS 2 undergoes a charge transfer insulator to metal transition above 28 GPa. Laser annealing reveals a kinetically hindered high pressure arsenopyrite phase that is recoverable to ambient. The new phase is similar to the Mn-dichalcogenides rather than the expected Re-dichalcogenides and involves the formation of S–S and Tc–Tc bonds.
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$β$ -Technetium: An allotrope with a nonstandard volume-pressure relationship

https://doi.org/10.1103/PhysRevMaterials.5.063603

Siska, Emily; Smith, Dean; Childs, Christian; Koury, Daniel; Forster, Paul M.; Lawler, Keith V.; Salamat, Ashkan (June 2021, Physical Review Materials)
null (Ed.)
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Colossal Density-Driven Resistance Response in the Negative Charge Transfer Insulator ${MnS}_{2}$

https://doi.org/10.1103/PhysRevLett.127.016401

Durkee, Dylan; Dasenbrock-Gammon, Nathan; Smith, G. Alexander; Snider, Elliot; Smith, Dean; Childs, Christian; Kimber, Simon A. J.; Lawler, Keith V.; Dias, Ranga P.; Salamat, Ashkan (June 2021, Physical Review Letters)
null (Ed.)
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Synthesis and chemical stability of technetium nitrides

https://doi.org/10.1039/D1CC02525B

Siska, Emily; Smith, Dean; Salamat, Ashkan; Lawler, Keith V.; Lavina, Barbara; Poineau, Frederic; Forster, Paul M. (January 2021, Chemical Communications)
null (Ed.)
We demonstrate the synthesis and phase stability of TcN, Tc 2 N, and a substoichiometric TcN x from 0 to 50 GPa and to 2500 K in a laser-heated diamond anvil cell. At least potential recoverability is demonstrated for each compound. TcN adopts a previously unpredicted structure identified via crystal structure prediction.
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