Single-crystal structure of HoBaCo4O7 at ambient conditions, at low temperature, and at high pressure

We show that the correct space group of HoBaCo4O7 at ambient conditions is P63mc and that no temperature-induced or pressure-induced structural phase transition occurs down to 100 K or up to 9 GPa. The ompressibility of HoBaCo4O7 is mainly determined by a combination of bond compression and changes in the three-membered and six-membered rings of the kagomé layers. HoBaCo4O7 is more compressible than structurally related compounds due to the comparatively compressible Co-O bonds. The structural analysis allows us to propose an atomistic model for the extremely high oxygen incorporation capability of HoBaCo4O7. ©2009 American Physical Society

Keywords

Phase transformations, Crystal structure, Monocrystals, Oxygen, Temperature range 0065-0273 K, Pressure range mega pa 10-100

Citation

Juarez-Arellano, E. A., Friedrich, A., Wilson, D. J., Wiehl, L., Morgenroth, W., Winkler, B., Avdeev, M., Macquart, R. B., & Ling, C. D. (2009) Single-crystal structure of HoBaCo 4 O 7 at ambient conditions, at low temperature, and at high pressure. Physical Review B, 79(6), 064109. doi:10.1103/PhysRevB.79.064109