Cage Adaption by High-Pressure Synthesis: The Clathrate-I Borosilicide Rb<sub>8</sub>B<sub>8</sub>Si<sub>38</sub>
Julia‐Maria Hübner, Walter Jung, Marcus Schmidt, Matej Bobnar, Primoz Koželj, Bodo Böhme, Michael Baitinger, Martin Etter, Yuri Grin, Ulrich Schwarz
Abstract
Rb8B8Si38 forms under high-pressure, high-temperature conditions at p = 8 GPa and T = 1273 K. The new compound (space group Pm3̅n, a = 9.9583(1) Å) is the second example for a clathrate-I borosilicide. The phase is inert against strong acids and bases and thermally stable up to 1300 K at ambient pressure. (Rb+)8(B–)8(Si0)38 is electronically balanced, diamagnetic, and shows semiconducting behavior with moderate Seebeck coefficient below 300 K. Chemical bonding analysis by the electron localizability approach confirms the description of Rb8B8Si38 as Zintl phase.
Topics & Concepts
ChemistryClathrate hydrateDiamagnetismZintl phaseSeebeck coefficientInert gasThermoelectric effectPhase (matter)CrystallographyHigh pressureGroup (periodic table)Inorganic chemistryAnalytical Chemistry (journal)ThermodynamicsCrystal structureHydrateOrganic chemistryMagnetic fieldPhysicsQuantum mechanicsRare-earth and actinide compoundsIron-based superconductors researchInorganic Chemistry and Materials