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http://hdl.handle.net/11375/29151
Title: | An X-ray Diffraction Study of (NH4)2TeBr6 and Ce2TeBr6 |
Authors: | Das, Ajit Kumar |
Advisor: | Brown, I. D. |
Department: | Physics |
Keywords: | X-ray diffraction;(NH4)2TeBr6;Ce2TeBr6;Three dimensional single crystal intensity |
Publication Date: | May-1967 |
Abstract: | The crystal structures of (NH4)2TeBr6 and Ce2TeBr6 have been reinvestigated using X-ray diffraction from powders and single crystals. Three dimensional single crystal intensity data obtained photographically have been used to refine these structures, which are of the cubic K2PtCl6 type, by a full matrix least squares analysis. The Te-Br bond is found to be 2.70* in both crystals after correction for the thermal notion of the atoms. A phase transition in (NH4)2TeBr6 has been observed at about 183°K. Pros an examination of Weissenberg photographs taken at 163°K, the low temperature phase is found to be tetragonal, space group p4/mnc (D64h) with a « 7.501+/-0.005* and c =10.765*+/-0.005*. The transformation in this case is probably similar to that reported in other isomorphous crystals, e.g., K2snBr6. A review of other crystals with similar structure is included in this thesis and the theory of X-ray diffraction as applicable to the present problem is discussed briefly. |
URI: | http://hdl.handle.net/11375/29151 |
Appears in Collections: | Digitized Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Das_Ajit_K_1967May_masters_new.pdf | 4.11 MB | Adobe PDF | View/Open |
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