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- W2893565826 abstract "Isovalent substitution of S by Se in LaOBiS2−xSex has a substantial effect on its electronic structure and thermoelectric properties. To investigate the possible role of BiS2 structural instability, we have studied the local structure of LaOBiS2−xSex () using temperature dependent Bi L3-edge extended x-ray absorption fine structure measurements. The results reveal that the local structure of the two compounds is significantly different. The BiS2 sub-lattice is largely distorted in LaOBiS2 (x = 0.0), with two in-plane Bi–S1 distances separated by ∼0.4 Å instead LaOBiSSe (x = 1.0) showing much smaller local disorder with two in-plane Bi–Se distances in the plane being separated by ∼0.2 Å. Temperature dependent study shows that the two Bi–S1 distances are characterized by different bond strength in LaOBiS2 (x = 0.0) while it is similar for the Bi–Se distances in LaOBiSSe (x = 1.0). The out of plane Bi–S2 bond is harder in LaOBiSSe indicating that the structural instability of BiS2 layer has large effect on the out-of-plane atomic correlations. The results suggest that the local structure of LaOBiS2−xSex is an important factor to describe differing electronic and thermal transport of the two compounds." @default.
- W2893565826 created "2018-10-05" @default.
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- W2893565826 date "2018-10-22" @default.
- W2893565826 modified "2023-10-16" @default.
- W2893565826 title "Suppression of structural instability in LaOBiS<sub>2−<i>x</i> </sub>Se<sub> <i>x</i> </sub> by Se substitution" @default.
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- W2893565826 doi "https://doi.org/10.1088/1361-648x/aae501" @default.
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