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. 2021 Mar 23;33(7):2408–2419. doi: 10.1021/acs.chemmater.0c04491

Figure 3.

Figure 3

Structural and optical properties of the Rb23BixSb7−xSbV2Cl54 phase. (a) Optical images of the Rb23BixSb7−xSbV2Cl54 series with the color changing from red to yellow as x increases, becoming more Bi-rich. (b) The unit cell of Rb23Bi6.62Sb0.38SbV2Cl54 displayed along the (210) plane. (c) Metal-halide octahedral sites of the ordered and disordered layers, as emphasized in (b), with purple bonds showing the lengthened bonds along the direction of BiIII(SbIII) lone pair expression. Note that the Cl atoms of site Bi6 are 1/3 occupied, reflecting the 3-fold rotational disorder of the octahedra. d) Structure field diagram of mixed-valent metal-halide phases and Rb23BixSb7−xSbV2Cl54 phases. (e) KM spectrum for Rb23BiIII7SbV2Cl54.