Incommensurate structures of the [CH₃NH₃][Co(COOH)₃] compound.

ABSTRACT: The present article is devoted to the characterization of the structural phase transitions of the [CH₃NH₃][Co(COOH)₃] (1) perovskite-like metal-organic compound through variable-temperature single-crystal neutron diffraction. At room temperature, compound 1 crystallizes in the orthorhombic space group Pnma (phase I). A decrease in temperature gives rise to a first phase transition from the space group Pnma to an incommensurate phase (phase II) at approximately 128 K. At about 96 K, this incommensurate phase evolves into a second phase with a sharp change in the modulation vector (phase III). At lower temperatures (ca 78 K), the crystal structure again becomes commensurate and can be described in the mo

SUBMITTER: Canadillas-Delgado L 

PROVIDER: S-EPMC6327183 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature