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

42 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	EPL
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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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.\}",

year = "2011",

month = aug,

doi = "10.1209/0295-5075/95/37007",

language = "English",

volume = "95",

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T1 - Phase transition, superstructure and physical properties of K 2Fe 4Se 5

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.

UR - https://www.scopus.com/pages/publications/84860408449

U2 - 10.1209/0295-5075/95/37007

DO - 10.1209/0295-5075/95/37007

M3 - Article

AN - SCOPUS:84860408449

SN - 0295-5075

VL - 95

JO - EPL

JF - EPL

IS - 3

M1 - 37007

ER -

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

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