A14AlSb11 (A = Ca, Sr, Ba) is synthesized by reacting the elements in stoichiometric amounts at high temperature (1250°C). Single-crystal X-ray diffraction data (130 K: a = 17.493 (4) Å, c = 23.480 (8) Å (Sr); a = 18.293 (2) Å, c = 24.222 (9) Å (Ba)) were refined (tetragonal, I41/acd (142), Z = 8; R = 4.02%, Rw = 4.26% (Sr); R = 3.71%, Rw = 4.34% (Ba)) and showed these compounds to be isostructural to Ca14AlSb11. Single-crystal X-ray and microprobe data indicate that these compounds are slightly deficient in Al. Temperature-dependent resistivity measurements show that these materials are intrinsic semiconductors with activation energies of 0.0143, 0.0667, and 0.4814 eV for the Ca, Sr, and Ba analogs, respectively.
ASJC Scopus subject areas
- Materials Chemistry
- Physical and Theoretical Chemistry
- Inorganic Chemistry