Abstract
The title compound was prepared by direct fusion of the corresponding elements at 800°C followed by slow cooling to room temperature. It crystallizes in the orthorhombic space group Pbcm (No. 57) with a=11.340(2), b=8.745(2), and c=14.920(2) Å, V=1479.8(5) Å 3, and Z=4. The structure is made of isolated V-shaped trimers As 3 5− and sodium and barium countercations. According to magnetic and resistivity measurements, Na 4Ba 3As 6 is a narrow-gap semiconductor, i.e. a closed-shell compound that fulfills the Zintl concept.
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