| 摘要 |
An organic sol containing lead (Pb), magnesium (Mg) and niobium (Nb) ions is claimed. It is obtained by (i) preparing a solution (PM) containing Pb and Mg compounds by (a) (1) dissolving a hydrated Pb carboxylate of the formula Pb(O2CR)2 x mH2O and/or lead oxide (PbO) in solvent(s) (I) or (II), using >= 2 moles (I)/mole PbO, giving solution (P); (2) dissolving Mg and/or magnesium oxide (MgO) in solvent(s) (I) or (II), giving solution (M); and (3) mixing these solutions, giving solution PM; or (b) dissolving Pb(O2CR)2 x mH2O and/or PbO and Mg and/or MgO in solvent(s) (I) or (II); in which X = oxygen (O), sulphur (S) or imino (NR<5>); R, R<1>, R<2>, R<3>, R<5> = optionally substituted and/or unsaturated alkyl with 1-10 or more carbon (C) atoms or optionally substituted aryl; or R<1> = R<4> X; or R<2>R<3> = a bridging group; n = 1 or 2; R<6> = optionally substituted and/or unsaturated 1-10, preferably 1-4 C alkyl; and (ii) adding a Nb alkoxylate of the formula Nb(OR<6>)5, optionally as solution (N), such that at least one of the solutions contains a substituted carboxylic acid of formula (I; R<1> = R<4> X) or a substituted alcohol of formula (II) in at least the equimolar amount with respect to Nb. Also claimed are (1) methods for producing thin ceramic coatings and fibres based on PMN (Pb-Mg-niobate) or PMNT (Pb-Mg niobate-titanate) and coatings and fibres with electrostrictive properties; and (2) the ceramic and ceramic electrostrictive fibres per se. |
