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Crystal structures and photocatalysis of the triclinic polymorphs of BiNbO4 and BiTaO4 |
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| Authors: | B Muktha Giridhar Madras |
| Institution: | a Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India b Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-C.N.R.S), Université de Bordeaux 1, 87, Avenue A. Schweitzer, 33608 Pessac Cedex, France c Department of Chemical Engineering Indian Institute of Science, Bangalore 560012, India |
| Abstract: | The high-temperature polymorphs of two photocatalytic materials, BiNbO4 and BiTaO4 were synthesized by the ceramic method. The crystal structures of these materials were determined by single-crystal X-ray diffraction. BiNbO4 and BiTaO4 crystallize into the triclinic system P1¯ (No. 2), with a=5.5376(4) Å, b=7.6184(3) Å, c=7.9324(36) Å, α=102.565(3)°, β=90.143(2)°, γ=92.788 (4)°, V=326.21 (5) Å3, Z=4 and a=5.931 (1) Å, b=7.672 (2) Å, c=7.786 (2) Å, α=102.94 (3)°, β=90.04 (3)° γ=93.53 (3)°, V=344.59 (1) Å3 and Z=4, respectively. The structures along the c-axis, consist of layers of Bi2O2] units separated by puckered sheets of (Nb/Ta)O6 octahedra. Photocatalytic studies on the degradation of dyes indicate selectivity of BiNbO4 towards aromatics containing quinonic and azo functional groups. |
| Keywords: | Single-crystal X-ray diffraction Crystal structure Bismuth niobate Bismuth tantalate Photocatalysis |
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