Phase transition, superstructure and physical properties of K 2Fe 4Se 5

Y. J. Song; Z. Wang; Z. W. Wang; H. L. Shi; Z. Chen; H. F. Tian; G. F. Chen; H. X. Yang; J. Q. Li

doi:10.1209/0295-5075/95/37007

Phase transition, superstructure and physical properties of K ₂Fe ₄Se ₅

Y. J. Song^*, Z. Wang, Z. W. Wang, H. L. Shi, Z. Chen, H. F. Tian, G. F. Chen, H. X. Yang, J. Q. Li

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

41 Citations (Scopus)

Abstract

The structural features and physical properties of the antiferromagnetic K _0.8Fe _1.6Se ₂ (so-called K ₂Fe ₄Se ₅ phase) have been studied in the temperature range from 300 K up to 600 K. Resistivity measurements on both single crystal and polycrystalline samples reveal a semiconducting behavior. Structural investigations of K ₂Fe ₄Se ₅ by means of transmission electron microscopy (TEM) and powder X-ray diffraction (XRD) demonstrate the presence of a well-defined superstructure within the a-b plane originating from a Fe-vacancy order along the [1-10] direction (indexed based on the supercell with space group of I4/m). Moreover, in situ heating structural analysis shows that K _0.8Fe _1.6Se ₂ undergoes a transition of the Fe-vacancy order to disorder at about 600 K. The phase separation and the Fe-vacancy ordering in the superconducting materials of K _xFe _2-ySe ₂ (0.2 ≤y ≤ 0.3) has been briefly discussed.

Original language	English
Article number	37007
Journal	Europhysics Letters
Volume	95
Issue number	3
DOIs	https://doi.org/10.1209/0295-5075/95/37007
Publication status	Published - Aug 2011
Externally published	Yes

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Song, Y. J., Wang, Z., Wang, Z. W., Shi, H. L., Chen, Z., Tian, H. F., Chen, G. F., Yang, H. X., & Li, J. Q. (2011). Phase transition, superstructure and physical properties of K ₂Fe ₄Se ₅ Europhysics Letters, 95(3), Article 37007. https://doi.org/10.1209/0295-5075/95/37007

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title = "Phase transition, superstructure and physical properties of K 2Fe 4Se 5 ",

abstract = "The structural features and physical properties of the antiferromagnetic K 0.8Fe 1.6Se 2 (so-called K 2Fe 4Se 5 phase) have been studied in the temperature range from 300 K up to 600 K. Resistivity measurements on both single crystal and polycrystalline samples reveal a semiconducting behavior. Structural investigations of K 2Fe 4Se 5 by means of transmission electron microscopy (TEM) and powder X-ray diffraction (XRD) demonstrate the presence of a well-defined superstructure within the a-b plane originating from a Fe-vacancy order along the [1-10] direction (indexed based on the supercell with space group of I4/m). Moreover, in situ heating structural analysis shows that K 0.8Fe 1.6Se 2 undergoes a transition of the Fe-vacancy order to disorder at about 600 K. The phase separation and the Fe-vacancy ordering in the superconducting materials of K xFe 2-ySe 2 (0.2 ≤y ≤ 0.3) has been briefly discussed.",

author = "Song, {Y. J.} and Z. Wang and Wang, {Z. W.} and Shi, {H. L.} and Z. Chen and Tian, {H. F.} and Chen, {G. F.} and Yang, {H. X.} and Li, {J. Q.}",

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AU - Song, Y. J.

AU - Wang, Z.

AU - Wang, Z. W.

AU - Shi, H. L.

AU - Chen, Z.

AU - Tian, H. F.

AU - Chen, G. F.

AU - Yang, H. X.

AU - Li, J. Q.

PY - 2011/8

Y1 - 2011/8

N2 - The structural features and physical properties of the antiferromagnetic K 0.8Fe 1.6Se 2 (so-called K 2Fe 4Se 5 phase) have been studied in the temperature range from 300 K up to 600 K. Resistivity measurements on both single crystal and polycrystalline samples reveal a semiconducting behavior. Structural investigations of K 2Fe 4Se 5 by means of transmission electron microscopy (TEM) and powder X-ray diffraction (XRD) demonstrate the presence of a well-defined superstructure within the a-b plane originating from a Fe-vacancy order along the [1-10] direction (indexed based on the supercell with space group of I4/m). Moreover, in situ heating structural analysis shows that K 0.8Fe 1.6Se 2 undergoes a transition of the Fe-vacancy order to disorder at about 600 K. The phase separation and the Fe-vacancy ordering in the superconducting materials of K xFe 2-ySe 2 (0.2 ≤y ≤ 0.3) has been briefly discussed.

AB - The structural features and physical properties of the antiferromagnetic K 0.8Fe 1.6Se 2 (so-called K 2Fe 4Se 5 phase) have been studied in the temperature range from 300 K up to 600 K. Resistivity measurements on both single crystal and polycrystalline samples reveal a semiconducting behavior. Structural investigations of K 2Fe 4Se 5 by means of transmission electron microscopy (TEM) and powder X-ray diffraction (XRD) demonstrate the presence of a well-defined superstructure within the a-b plane originating from a Fe-vacancy order along the [1-10] direction (indexed based on the supercell with space group of I4/m). Moreover, in situ heating structural analysis shows that K 0.8Fe 1.6Se 2 undergoes a transition of the Fe-vacancy order to disorder at about 600 K. The phase separation and the Fe-vacancy ordering in the superconducting materials of K xFe 2-ySe 2 (0.2 ≤y ≤ 0.3) has been briefly discussed.

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VL - 95

JO - Europhysics Letters

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M1 - 37007

ER -

Phase transition, superstructure and physical properties of K ₂Fe ₄Se ₅

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