期刊
MATERIALS RESEARCH BULLETIN
卷 39, 期 12, 页码 1957-1965出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2004.05.020
关键词
ceramics; electronic materials
A series of nickel manganite ceramics of composition NixMn3-xO4 (0.28 less than or equal to x less than or equal to 1) has been prepared by sintering powders obtained using two different ways: the classic solid/solid reaction and the co-precipitation method (soft chemistry). The evolution of the three-point bend strength has been correlated to the density and the structure of the ceramics. As expected, the strength decreases with increasing porosity. A correlation has been observed between the flexure strength and the structure of the spinel phase. The bend strength increases as the structural distortion (c/a ratio) increases, probably due to a lowering of symmetry rather then a modification of the bond strength. Moreover, we show that a modification of the oxidation state does not affect the value of the flexure strength. (C) 2004 Elsevier Ltd. All rights reserved.
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