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http://nopr.niscpr.res.in/handle/123456789/20269| Title: | Synthesis and characterization of AgBiO3 with the cubic KSbO3 structure |
| Authors: | Sharma, Ramesh Mandal, T K Ramesha, K Gopalakrishnan, J |
| Issue Date: | Jan-2004 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | AgBiO3, isotypic with cubic (Im-3) KBiO3, has been prepared by K+/Ag+ ion-exchange starting from KBiO3, 1/3H2O. Rietveld refinement of the structure from powder X-ray diffraction data shows that AgBiO3 [a = 9.7852(2) Å; Z = 12; space group Im-3] consists of pairs of edge-shared BiO6 octahedra connected by common corners wherein the Ag+ reside in the tunnels along <111> direction. The BiO6 octahedra are distorted and the average Bi-O bond distance (2.117Å) is longer than the Bi- O distance (2.099 Å) in the parent. In addition, the Ag(2)-O(2) bond distance (2.429 A) is considerably short, signaling covalent interaction between Ag+ and BiO3ˉ framework. These structural changes are reflected in the optical properties as well ; while the brick red parent shows an absorption edge corresponding to ~2 eV band gap, black AgBiO3 shows free carrier absorption in the 400-800 nm range. Similar difference is also seen in the IR spectra. |
| Page(s): | 11-17 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.43A(01) [January 2004] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 43A(1) 11-17.pdf | 1.29 MB | Adobe PDF | View/Open |
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