The metastable Ni7±xS6, and mixed Ni 6±x(S1-ySey)5, phases

Y. Liu; L. Norén; R. L. Withers; J. Hadermann; G. Van Tendeloo; F. J. García-García

doi:10.1016/S0022-4596(02)00123-8

The metastable Ni_7±xS₆, and mixed Ni _6±x(S_1-ySe_y)₅, phases

Y. Liu, L. Norén, R. L. Withers^*, J. Hadermann, G. Van Tendeloo, F. J. García-García

^*Corresponding author for this work

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

6 Citations (Scopus)

Abstract

The closely related, narrowly non-stoichiometric, metastable as well as thermodynamically stable "phases" in the metal-rich part of the Ni-S phase diagram near the nominal composition Ni_7±xS₆ have been carefully re-investigated via electron diffraction and transmission electron microscope imaging. Two quite distinct polymorphs have been identified, a minority incommensurate interface-modulated polymorph and a (heavily twinned) majority I1a1, a=2a_p, b=2b_p, c=-a_p+c _p superstructure (of an underlying Bmmb, a_p∼3.3, b_p∼16.4, c_p∼11.3Å parent structure) polymorph. The incommensurate polymorph is shown to be very closely related to the only known polymorph of Ni_6±xSe₅ and is rapidly stabilized to room temperature upon doping of the sulfide compounds with selenium.

Original language	English
Pages (from-to)	351-360
Number of pages	10
Journal	Journal of Solid State Chemistry
Volume	170
Issue number	2
DOIs	https://doi.org/10.1016/S0022-4596(02)00123-8
Publication status	Published - 1 Feb 2003

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title = "The metastable Ni7±xS6, and mixed Ni 6±x(S1-ySey)5, phases",

abstract = "The closely related, narrowly non-stoichiometric, metastable as well as thermodynamically stable {"}phases{"} in the metal-rich part of the Ni-S phase diagram near the nominal composition Ni7±xS6 have been carefully re-investigated via electron diffraction and transmission electron microscope imaging. Two quite distinct polymorphs have been identified, a minority incommensurate interface-modulated polymorph and a (heavily twinned) majority I1a1, a=2ap, b=2bp, c=-ap+c p superstructure (of an underlying Bmmb, ap∼3.3, bp∼16.4, cp∼11.3{\AA} parent structure) polymorph. The incommensurate polymorph is shown to be very closely related to the only known polymorph of Ni6±xSe5 and is rapidly stabilized to room temperature upon doping of the sulfide compounds with selenium.",

keywords = "Metastable phases, NiS, TEM study",

author = "Y. Liu and L. Nor{\'e}n and Withers, {R. L.} and J. Hadermann and {Van Tendeloo}, G. and Garc{\'i}a-Garc{\'i}a, {F. J.}",

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language = "English",

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T1 - The metastable Ni7±xS6, and mixed Ni 6±x(S1-ySey)5, phases

AU - Liu, Y.

AU - Norén, L.

AU - Withers, R. L.

AU - Hadermann, J.

AU - Van Tendeloo, G.

AU - García-García, F. J.

PY - 2003/2/1

Y1 - 2003/2/1

N2 - The closely related, narrowly non-stoichiometric, metastable as well as thermodynamically stable "phases" in the metal-rich part of the Ni-S phase diagram near the nominal composition Ni7±xS6 have been carefully re-investigated via electron diffraction and transmission electron microscope imaging. Two quite distinct polymorphs have been identified, a minority incommensurate interface-modulated polymorph and a (heavily twinned) majority I1a1, a=2ap, b=2bp, c=-ap+c p superstructure (of an underlying Bmmb, ap∼3.3, bp∼16.4, cp∼11.3Å parent structure) polymorph. The incommensurate polymorph is shown to be very closely related to the only known polymorph of Ni6±xSe5 and is rapidly stabilized to room temperature upon doping of the sulfide compounds with selenium.

AB - The closely related, narrowly non-stoichiometric, metastable as well as thermodynamically stable "phases" in the metal-rich part of the Ni-S phase diagram near the nominal composition Ni7±xS6 have been carefully re-investigated via electron diffraction and transmission electron microscope imaging. Two quite distinct polymorphs have been identified, a minority incommensurate interface-modulated polymorph and a (heavily twinned) majority I1a1, a=2ap, b=2bp, c=-ap+c p superstructure (of an underlying Bmmb, ap∼3.3, bp∼16.4, cp∼11.3Å parent structure) polymorph. The incommensurate polymorph is shown to be very closely related to the only known polymorph of Ni6±xSe5 and is rapidly stabilized to room temperature upon doping of the sulfide compounds with selenium.

KW - Metastable phases

KW - NiS

KW - TEM study

UR - http://www.scopus.com/inward/record.url?scp=1642287568&partnerID=8YFLogxK

U2 - 10.1016/S0022-4596(02)00123-8

DO - 10.1016/S0022-4596(02)00123-8

M3 - Article

SN - 0022-4596

VL - 170

SP - 351

EP - 360

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 2

ER -

The metastable Ni_7±xS₆, and mixed Ni _6±x(S_1-ySe_y)₅, phases

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