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Crystal Growth and Physical Properties of Sr4Co3O7.5+xCl2 Single Crystals (x ∼ 0.14)

1
Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany
2
Max-Planck-POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 37673, Korea
3
National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(12), 623; https://doi.org/10.3390/cryst9120623
Received: 22 October 2019 / Revised: 12 November 2019 / Accepted: 17 November 2019 / Published: 27 November 2019
(This article belongs to the Special Issue Structure and Magnetic Properties of Transition Metal Oxides)
We report on the single crystal growth and physical properties of the triple-layer cobalt oxychloride Sr 4 Co 3 O 7 . 5 + x Cl 2 (x∼ 0.14) with 4-3-10 Ruddlesden–Popper type structure that was synthesized by a KCl-SrCl 2 flux method. The crystal structure was determined by means of single crystal X-ray diffraction. In this quasi two dimensional (2D) material two pyramidal CoO 5 layers and a central Co oxide layer with random oxygen deficiencies are forming the layered Co oxide blocks. These blocks are separated by Cl -ions which are interacting via Van der Waals forces, thus, enhancing the quasi 2D nature of this compound. The soft X-ray absorption spectra at the Co-L 2 , 3 edge and O-K edge indicate that Co ions are in high spin +3 state which is in agreement with the single crystal X-ray diffraction measurements that indicate basically pyramidal oxygen environments for the Co 3 + ions in this compound. View Full-Text
Keywords: single crystal growth; spin state; cobaltate; X-ray absorption spectroscopy single crystal growth; spin state; cobaltate; X-ray absorption spectroscopy
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Ryu, G.; Hu, Z.; Chang, C.-F.; Kuo, C.-Y.; Shin, K.; Lin, H.-J.; Chen, C.-T.; Tjeng, L.H.; Komarek, A.C. Crystal Growth and Physical Properties of Sr4Co3O7.5+xCl2 Single Crystals (x ∼ 0.14). Crystals 2019, 9, 623.

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