High-Pressure Synthesis of the Cobalt Pyrochlore Oxide Pb2Co2O7 with Large 
Cation Mixed Occupancy

Yang, Junye; Dai, Jianhong; Liu, Zhehong; Yu, Runze; Hojo, Hajime; Hu, Zhiwei; Pi, Tunwen; Soo, Yunhang; Jin, Changqing; Azuma, Masaki; Long, Youwen

doi:10.1021/acs.inorgchem.7b01646

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High-Pressure Synthesis of the Cobalt Pyrochlore Oxide Pb₂Co₂O₇ with Large Cation Mixed Occupancy

Yang, J., Dai, J., Liu, Z., Yu, R., Hojo, H., Hu, Z., et al. (2017). High-Pressure Synthesis of the Cobalt Pyrochlore Oxide Pb₂Co₂O₇ with Large Cation Mixed Occupancy. Inorganic Chemistry, 56(19), 11676-11680. doi:10.1021/acs.inorgchem.7b01646.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002E-134B-A Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002E-134D-6

Genre: Journal Article

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Creators:
Yang, Junye¹, Author
Dai, Jianhong¹, Author
Liu, Zhehong¹, Author
Yu, Runze¹, Author
Hojo, Hajime¹, Author
Hu, Zhiwei², Author
Pi, Tunwen¹, Author
Soo, Yunhang¹, Author
Jin, Changqing¹, Author
Azuma, Masaki¹, Author
Long, Youwen¹, Author

Affiliations:
1external, ou_persistent22
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461

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Abstract: The novel A(2)B(4)O(7)-type compound Pb2Co2O7 was synthesized at 8 GPa and 1673 K. Synchrotron X-ray diffraction shows a cubic pyrochlore structure with space group Fd (3) over barm. Rietveld structural analysis reveals a large cation mixed occupancy at both A and B sites by about 40%, the greatest value found in the pyrochlore family. In combination with the X-ray absorption spectroscopy results, the specific chemical composition and charge states are determined to be (Co0.6Pb0.4)(3+)(2)(Pb0.6Co0.4)O-4+(2)7 in which both the A-site Co3+ and the B-site Co4+ are low-spin. Due to the tetrahedral geometric frustration effects as well as the random Co4+ and Pb4+ distribution at the B site, spin glassy behavior is well observed following the conventional critical slowing down feature in Pb2Co2O7.

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Language(s): eng - English

Dates: Published Online: 2017-09-18Date issued: 2017-09-18

Publication Status: Issued

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Identifiers: ISI: 000412379000025
DOI: 10.1021/acs.inorgchem.7b01646

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Title: Inorganic Chemistry

Abbreviation : Inorg. Chem.

Source Genre: Journal

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Publ. Info: Washington, DC : American Chemical Society

Pages: - Volume / Issue: 56 (19) Sequence Number: - Start / End Page: 11676 - 11680 Identifier: ISSN: 0020-1669
CoNE: https://pure.mpg.de/cone/journals/resource/0020-1669