Microstructural properties of K0.8 Fe1.6 S 2, K0.8 Fe1.75 Se2-y Sy (0 ≤ y ≤ 2) and K0.8 Fe1.5+x S2 (0 < x ≤ 0.5) single crystals

Y. Cai; Z. Wang; Z. W. Wang; Z. A. Sun; H. X. Yang; H. F. Tian; C. Ma; B. Zhang; J. Q. Li

doi:10.1209/0295-5075/103/37010

Microstructural properties of K_0.8 Fe_1.6 S ₂, K_0.8 Fe_1.75 Se_2-y S_y (0 ≤ y ≤ 2) and K_0.8 Fe_1.5+x S₂ (0 < x ≤ 0.5) single crystals

Y. Cai, Z. Wang, Z. W. Wang, Z. A. Sun, H. X. Yang, H. F. Tian, C. Ma, B. Zhang, J. Q. Li

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

6 Citations (Scopus)

Abstract

The structural features of the antiferromagnetic K_0.8Fe _1.6S₂ have been studied in the temperature range from 300 K up to 700 K by means of in situ transmission electron microscopy (TEM). The superstructure with a wave vector originating from a Fe-vacancy order has been clearly observed; moreover, the structural analysis shows that K _0.8Fe_1.6S₂ undergoes a transition from the Fe-vacancy order to disorder at about 585 K. The S substitution effect on the phase separation and superconductivity in the K_0.8Fe _1.75Se_2-yS_y materials has been systematically investigated by SEM and TEM structural analyses, as well as by electrical resistivity measurements. Our experimental results reveal that the S element adopts a homogeneous distribution in all investigated materials, and the essential phase-separation nature is very similar to what was observed in the K_0.8Fe_1.75Se₂ superconductor. A phase-separated state formed by the coexistence of two Fe-vacancy orders with wave vectors and in K_0.8Fe_1.5+xS₂ (0 < x < 0.1) has been briefly discussed.

Original language	English
Article number	37010
Journal	Europhysics Letters
Volume	103
Issue number	3
DOIs	https://doi.org/10.1209/0295-5075/103/37010
Publication status	Published - Aug 2013
Externally published	Yes

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@article{deeef59f0f6146e59de368063472b103,

title = "Microstructural properties of K0.8 Fe1.6 S 2, K0.8 Fe1.75 Se2-y Sy (0 ≤ y ≤ 2) and K0.8 Fe1.5+x S2 (0 < x ≤ 0.5) single crystals",

abstract = "The structural features of the antiferromagnetic K0.8Fe 1.6S2 have been studied in the temperature range from 300 K up to 700 K by means of in situ transmission electron microscopy (TEM). The superstructure with a wave vector originating from a Fe-vacancy order has been clearly observed; moreover, the structural analysis shows that K 0.8Fe1.6S2 undergoes a transition from the Fe-vacancy order to disorder at about 585 K. The S substitution effect on the phase separation and superconductivity in the K0.8Fe 1.75Se2-ySy materials has been systematically investigated by SEM and TEM structural analyses, as well as by electrical resistivity measurements. Our experimental results reveal that the S element adopts a homogeneous distribution in all investigated materials, and the essential phase-separation nature is very similar to what was observed in the K0.8Fe1.75Se2 superconductor. A phase-separated state formed by the coexistence of two Fe-vacancy orders with wave vectors and in K0.8Fe1.5+xS2 (0 < x < 0.1) has been briefly discussed.",

author = "Y. Cai and Z. Wang and Wang, {Z. W.} and Sun, {Z. A.} and Yang, {H. X.} and Tian, {H. F.} and C. Ma and B. Zhang and Li, {J. Q.}",

year = "2013",

month = aug,

doi = "10.1209/0295-5075/103/37010",

language = "English",

volume = "103",

journal = "Europhysics Letters",

issn = "0295-5075",

publisher = "IOP Publishing Ltd.",

number = "3",

}

TY - JOUR

T1 - Microstructural properties of K0.8 Fe1.6 S 2, K0.8 Fe1.75 Se2-y Sy (0 ≤ y ≤ 2) and K0.8 Fe1.5+x S2 (0 < x ≤ 0.5) single crystals

AU - Cai, Y.

AU - Wang, Z.

AU - Wang, Z. W.

AU - Sun, Z. A.

AU - Yang, H. X.

AU - Tian, H. F.

AU - Ma, C.

AU - Zhang, B.

AU - Li, J. Q.

PY - 2013/8

Y1 - 2013/8

N2 - The structural features of the antiferromagnetic K0.8Fe 1.6S2 have been studied in the temperature range from 300 K up to 700 K by means of in situ transmission electron microscopy (TEM). The superstructure with a wave vector originating from a Fe-vacancy order has been clearly observed; moreover, the structural analysis shows that K 0.8Fe1.6S2 undergoes a transition from the Fe-vacancy order to disorder at about 585 K. The S substitution effect on the phase separation and superconductivity in the K0.8Fe 1.75Se2-ySy materials has been systematically investigated by SEM and TEM structural analyses, as well as by electrical resistivity measurements. Our experimental results reveal that the S element adopts a homogeneous distribution in all investigated materials, and the essential phase-separation nature is very similar to what was observed in the K0.8Fe1.75Se2 superconductor. A phase-separated state formed by the coexistence of two Fe-vacancy orders with wave vectors and in K0.8Fe1.5+xS2 (0 < x < 0.1) has been briefly discussed.

AB - The structural features of the antiferromagnetic K0.8Fe 1.6S2 have been studied in the temperature range from 300 K up to 700 K by means of in situ transmission electron microscopy (TEM). The superstructure with a wave vector originating from a Fe-vacancy order has been clearly observed; moreover, the structural analysis shows that K 0.8Fe1.6S2 undergoes a transition from the Fe-vacancy order to disorder at about 585 K. The S substitution effect on the phase separation and superconductivity in the K0.8Fe 1.75Se2-ySy materials has been systematically investigated by SEM and TEM structural analyses, as well as by electrical resistivity measurements. Our experimental results reveal that the S element adopts a homogeneous distribution in all investigated materials, and the essential phase-separation nature is very similar to what was observed in the K0.8Fe1.75Se2 superconductor. A phase-separated state formed by the coexistence of two Fe-vacancy orders with wave vectors and in K0.8Fe1.5+xS2 (0 < x < 0.1) has been briefly discussed.

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U2 - 10.1209/0295-5075/103/37010

DO - 10.1209/0295-5075/103/37010

M3 - Article

AN - SCOPUS:84884550836

SN - 0295-5075

VL - 103

JO - Europhysics Letters

JF - Europhysics Letters

IS - 3

M1 - 37010

ER -

Microstructural properties of K_0.8 Fe_1.6 S ₂, K_0.8 Fe_1.75 Se_2-y S_y (0 ≤ y ≤ 2) and K_0.8 Fe_1.5+x S₂ (0 < x ≤ 0.5) single crystals

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