The noncentrosymmetric chain compounds, A3M2AsSe 11 (A = K, Rb, Cs; M = Nb, Ta)

Junghwan Do; Mercouri G Kanatzidis

doi:10.1016/j.jallcom.2004.03.088

The noncentrosymmetric chain compounds, A₃M₂AsSe ₁₁ (A = K, Rb, Cs; M = Nb, Ta)

Junghwan Do, Mercouri G Kanatzidis

Northwestern University

Research output: Contribution to journal › Article

8 Citations (Scopus)

Abstract

The noncentrosymmetric niobium and tantalum selenoarsenates, A ₃Nb₂AsSe₁₁ (A=K, Rb, Cs) and K ₃Ta₂AsSe₁₁, were synthesized in a polyselenoarsenate flux. All compounds crystallize in the polar monoclinic space group Cc. The structures are comprised of the same type of infinite chain anions, [M₂Se₂(Se₂)₃(AsSe ₃)]^3- (M=Nb, Ta) separated by alkali metal cations. The As³⁺ centers with nonbonded electron pairs play an important role in stabilizing the noncentrosymmetric structures. UV-Vis spectroscopy, Raman spectroscopy and differential thermal analysis data are reported. The energy gaps of these compounds vary between 1.35 and 1.53eV.

Original language	English
Pages (from-to)	41-49
Number of pages	9
Journal	Journal of Alloys and Compounds
Volume	381
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2004.03.088
Publication status	Published - Nov 3 2004

Fingerprint

Niobium

Tantalum

Alkali Metals

Alkali metals

Ultraviolet spectroscopy

Differential thermal analysis

Anions

Raman spectroscopy

Cations

Energy gap

Negative ions

Positive ions

Fluxes

Electrons

Keywords

Flux synthesis
Non linear optical piezoelectricity
Non-oxide materials

ASJC Scopus subject areas

Metals and Alloys

Cite this

Do, J., & Kanatzidis, M. G. (2004). The noncentrosymmetric chain compounds, A₃M₂AsSe ₁₁ (A = K, Rb, Cs; M = Nb, Ta). Journal of Alloys and Compounds, 381(1-2), 41-49. https://doi.org/10.1016/j.jallcom.2004.03.088

The noncentrosymmetric chain compounds, A₃M₂AsSe ₁₁ (A = K, Rb, Cs; M = Nb, Ta). / Do, Junghwan; Kanatzidis, Mercouri G.

In: Journal of Alloys and Compounds, Vol. 381, No. 1-2, 03.11.2004, p. 41-49.

Research output: Contribution to journal › Article

Do, J & Kanatzidis, MG 2004, 'The noncentrosymmetric chain compounds, A₃M₂AsSe ₁₁ (A = K, Rb, Cs; M = Nb, Ta)', Journal of Alloys and Compounds, vol. 381, no. 1-2, pp. 41-49. https://doi.org/10.1016/j.jallcom.2004.03.088

Do J, Kanatzidis MG. The noncentrosymmetric chain compounds, A₃M₂AsSe ₁₁ (A = K, Rb, Cs; M = Nb, Ta). Journal of Alloys and Compounds. 2004 Nov 3;381(1-2):41-49. https://doi.org/10.1016/j.jallcom.2004.03.088

Do, Junghwan ; Kanatzidis, Mercouri G. / The noncentrosymmetric chain compounds, A₃M₂AsSe ₁₁ (A = K, Rb, Cs; M = Nb, Ta). In: Journal of Alloys and Compounds. 2004 ; Vol. 381, No. 1-2. pp. 41-49.

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10.1016/j.jallcom.2004.03.088