Thermal gradient induced sidebranching in directional solidification |
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| Authors: | M Georgelin A Pocheau |
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| Institution: | (1) National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, P.R. China, CN;(2) Department of Chemistry, Nanjing University, Nanjing 210093, P.R. China, CN;(3) Department of Physics, Hebei Normal University, Shijiazhuang 050091, P. R. China, CN |
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| Abstract: | The polycrystalline perovskitelike manganese oxides La1-xAxMnO (A = Na, and K, ) have been fabricated by sol-gel technique. For all the compositions explored in this work, the average manganese oxidation
state is practically constant, at for A = Na, and for A = K, respectively. A close relationship is confirmed to hold between the Curie temperature (Tc) and the bond distance of Mn-O. Results of magnetic measurements show that these materials can be utilized as suitable candidates
for magnetic refrigerants with wide applied temperature span, for their significant entropy change and the easily tuned Curie
temperature.
Received: 12 September 1997 / Revised: 18 December 1997 / Accepted: 21 January 1998 |
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| Keywords: | PACS 75 30 Sg Magnetocaloric effect - 82 80 -d Chemical analysis and related physical methods of analysis - 81 05 Mh Cermets ceramic and refractory composites |
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