TY - JOUR
T1 - The noncentrosymmetric chain compounds, A3M2AsSe 11 (A = K, Rb, Cs; M = Nb, Ta)
AU - Do, Junghwan
AU - Kanatzidis, Mercouri G.
N1 - Funding Information:
Financial support from the National Science Foundation (Grant DMR-0127644) is gratefully acknowledged.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/11/3
Y1 - 2004/11/3
N2 - 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.
AB - 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.
KW - Flux synthesis
KW - Non linear optical piezoelectricity
KW - Non-oxide materials
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U2 - 10.1016/j.jallcom.2004.03.088
DO - 10.1016/j.jallcom.2004.03.088
M3 - Article
AN - SCOPUS:4944221158
VL - 381
SP - 41
EP - 49
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 1-2
ER -