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

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

doi:10.1021/acs.inorgchem.7b01646

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

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

Functional Materials Science

Research output: Contribution to journal › Article

3 Citations (Scopus)

Abstract

The novel A₂B₂O₇-type compound Pb₂Co₂O₇ was synthesized at 8 GPa and 1673 K. Synchrotron X-ray diffraction shows a cubic pyrochlore structure with space group Fd3m. 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 (Co_0.6Pb_0.4)³⁺₂(Pb_0.6Co_0.4)⁴⁺₂O₇, 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.

Original language	English
Pages (from-to)	11676-11680
Number of pages	5
Journal	Inorganic chemistry
Volume	56
Issue number	19
DOIs	https://doi.org/10.1021/acs.inorgchem.7b01646
Publication status	Published - Oct 2 2017

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All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Inorganic Chemistry

Cite this

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

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, Yunliang; Jin, Changqing; Azuma, Masaki; Long, Youwen.

In: Inorganic chemistry, Vol. 56, No. 19, 02.10.2017, p. 11676-11680.

Research output: Contribution to journal › Article

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title = "High-Pressure Synthesis of the Cobalt Pyrochlore Oxide Pb2Co2O7 with Large Cation Mixed Occupancy",

abstract = "The novel A2B2O7-type compound Pb2Co2O7 was synthesized at 8 GPa and 1673 K. Synchrotron X-ray diffraction shows a cubic pyrochlore structure with space group Fd3m. 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)4+2O7, 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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AU - Yang, Junye

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AU - Liu, Zhehong

AU - Yu, Runze

AU - Hojo, Hajime

AU - Hu, Zhiwei

AU - Pi, Tunwen

AU - Soo, Yunliang

AU - Jin, Changqing

AU - Azuma, Masaki

AU - Long, Youwen

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N2 - The novel A2B2O7-type compound Pb2Co2O7 was synthesized at 8 GPa and 1673 K. Synchrotron X-ray diffraction shows a cubic pyrochlore structure with space group Fd3m. 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)4+2O7, 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.

AB - The novel A2B2O7-type compound Pb2Co2O7 was synthesized at 8 GPa and 1673 K. Synchrotron X-ray diffraction shows a cubic pyrochlore structure with space group Fd3m. 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)4+2O7, 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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Access to Document

10.1021/acs.inorgchem.7b01646