Answers are grounded in this paper and cite their sources.
Temperature variation of the crystal structure has been investigated for Tb 2 Ba 2 Co 4 O 11 , which shows a metal-insulator (MI) transition at T MI = 340 K. The compound has a layered-type double-perovskite structure along the c -axis, with alternating the CoO 6 octahedron and the CoO 5 pyramids along the a -axis. With decrease of temperature below T MI , the distortion of the octahedral and pyramidal sites is fairly released, suggesting that spin state transition of the Co 3+ ions is the origin for the MI transition.
No takes yet. Share an insight, caveat, or question.
Kusuya et al. (2001) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: