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STRUCTURAL TRANSFORMATION INDUCED By MECHANICALLy DRIVEN ALLOyING AND SUBSEQUENT MAGNETIC PROPERLIESOF THE Fe-Cu SySTEM

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Acta Metallurgica Sinica(English Letters) 1998年第2期11卷 128-136页

作者： y.Z.yang y.hluo Q.S.Li y.L.Zhu X.M.Ma y.D.Dong y.Z.Chuang Guangdong Univ of Technology Guangzhou China

The structural transformation in Fe-Cu powder induced by mechanically driven alloying has been monitored by the lattice constant measurements and Mossbauer spectroscopy. For the samples with Cu higher than 75at.% Mossbauer the spectra show a broad paramagnetic doublet; for samples with 50 and 60at.%Cu a new broad ferromagnetic sextet; for those with less than 30at.%Cu similar to those of α-Fe. The main peaks of the hyperfine field distribution significantly broaden and shift to a lower position with increasing Cu content due to the complex environments of iron atoms in the solid solutions and the reduction in the nearest neighbor Fe of a cental Fe atom, respectively. The saturation magnetization of Fe-Cu alloys monotonously decreases with Cu content. The complex composition dependence of coercive field for the milled samples is discussed with respect to the solid dissolution, grain size, interfacial state etc.. The increase of lattice constants with the solute content in the two terminal solid solutions has been explained by the volume-size factor theory or magnetovolume effect.

关键词： mechanical alloying Mossbauer effect Fe-Cu alloy magnetic measurement

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弛豫铁电单晶PMNT的生长及压电性能

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人工晶体学报 2000年第S1期29卷 87-页

作者： LUO Hao su, XU Gui sheng, XU Hai qing, QI Zhen yi, ZHONG Wei zhuo,yIN Zhi wen (Laboratory of Functional Inorganic Materials,Shanghai Institute of Ceramics, Chinese Academy of Sciences,Shanghai 201800,China) (E-mail:hluo@***)

It is difficult for the growth of relaxor ferroelectric single crystal (1 x ) Pb(Mg 1/3 Nb 2/3 )O 3 x PbTiO 3 (abbreviated as PMNT).The first reason is that there are four oxides as raw materials which are easily result in the nonstoichiometry and inhomogeneity for the single crystals,the second is that the pyrochlore phases appear easily for general growth condition that will reduce the dielectric and piezoelectric performance of PMNT single crystals,and the third is that the platinum crucible is easily leaked at the melting temperature of PMNT.A feasible technique has been used for the growth of PMNT single crystals after we researched the stability,structure and relation of PMN PT phases at high *** we can fabricate the large size and high quality of PMNT single crystals by a modified Bridgman technique.

关键词： ferroelectric single crystal PMNT Bridgman method piezoelectric properties

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