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 Wysłany: Nie 6:49, 02 Sty 2011 Temat postu: mbt scarpe outlet Gel PbTiO3 thin films _42 |
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Preparation of PbTiO3 thin films
00083, China) AbstractPreparationofPbTiO8thinfilmbysol-gelprocessisreposedandoptimumconditionsofpreparationarefound. Thefilmthicknessofabout0.5lxmhasobtained. Through0bgeIvatiaIl8undermicroscopyandexaminedbyX-raydi ~ fra-ctometerthefilmisofmerimofSl ~ OOthing, uni {ormltyandcrack-free, anditsstructurebclongstoperovskite. KeywordslSol-gelprocess, PbTiO3thlnfilm, Pcrovskitecrystallization I. Introduction gel is relatively recent years the international research field, then jump, have been widely used in specialty glass, functional igST Youth Foundation Science and Technology Commission of Shanghai Tan hide. This article was a knee in the first Gan Bei, scientific and technical reports will be read out plastic ceramics,[link widoczny dla zalogowanych], high-temperature superconducting materials such preparation. Although China started late, but it has caused a high degree of attention. Not only can be prepared by gel material, but also in the preparation of thin film, powder, coating,[link widoczny dla zalogowanych], electronic packaging, also has a wide range of touch with the front: 19 * King. Preparation of thin limb connected with the Ning good uniformity and high purity, groups were accurate,[link widoczny dla zalogowanych], and low sintering temperature, and the necessary equipment is relatively simple. This article reports the film with the gel PbTiO8 preliminary results. Second,[link widoczny dla zalogowanych], the experimental results of gel films with the process flow chart is as follows: plant - one by one - l Zhu Zhu Zhu Jian Lan Zhu H limonene l Figure 1 process the State '. In this study, the synthesis of the initial solution, the main raw material; Al lead acetate EPbCAc)] 2 (AR) B: ethylene glycol monomethyl ether (CHOCHCHtOH) (fE Xuechun) Ct butyl titanate (TiCC. H. Ot) ( chemical pure), said certain amount of raw material A into the round bottom flask 1 (see Figure 2), according to AtB = 1. 5 molar ratio of adding the right amount of raw material B, at 70. C, dissolved. Then heated to boiling (~ 130. C), vacuum distillation. Repeat several times by adding distilled material B to cool to 90. c adding raw c (AlC = 1. 1), until after the full reaction, heated to boiling to distillation. Finally add the right amount of raw material B, diluted to a good distillation, which may play an initial solution. Figure 2 Bu a pumping; z a-ling condensate tube; 3 to Inlet: 4 A 2-5 a water flask; 6, a temperature {T -) Jg material 8 a flask 1i9 a petrol margin: l0 a magnetic heating Stir ��. . 2. Synthesis of the form of condensate Suo good initial solution hydrolysis gel. The process can be expressed as tM (OR) + HjO ---- ~ M (OR) a J (OH) + ROH [here {M ~ metallic element f (0R) a hydrocarbon oxy} (0H) a light-based] The initial solution of metal organic compounds and water effects, the first monomer into a metal,[link widoczny dla zalogowanych], and then synthesis of these monomers together again or Lanwei chain network structure. Reaction is: 2M (0R) a - (0H) - (0R). jM ~ 0 a M (0R). - + H2OM (0R) a, + M (0R )---( OR) a-M ~ 0-M (0R). 1 + ROH development of three-dimensional network, resulting in solution to form gel-free mobility. Therefore, the gel formation process is actually a hydrolysis process. It was found that the time t and the initial hydrolysis solution related. Different initial solutions can vary greatly during the hydrolysis (tens of minutes to several small pairs). Under different circumstances, t are also different in size. Temperature, the hydrolysis rate was accelerated (t decreases), acid hydrolysis time the media will be extended to t} alkaline medium is reduced. Table 1 shows the hydrolysis of the same initial conditions the solution 3. Creeping film prepared by hydrolysis to form the initial solution, gel solution, the amount of gel drops in the selected substrate substrate to 1000 ~ 02000a. . [21O] a 3.126 <. '<PbTLO a �� PbTiO. ; Mane 0. t42 �� indiscriminately 5 condensing limb X-ray diffraction curves of films (a) serious loss of Pb (6000'C) (b) loss of Pb significantly improve the situation Peng (52O'C)
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