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翻译成英文： 欧盟发布禁铅政策以来，无铅压电陶瓷的研究开发竞争日益激烈，LiNbO3陶瓷优良的性能受到各国学者的广泛关注。近年来，为了制备组分均匀、晶粒细小的纳米级陶瓷，采用湿化学法制备陶瓷粉体的发展很快。水热法是湿化学法的一种，此法制备的陶瓷粉体无需高温煅烧处理，避免了煅烧过程中造成的晶粒长大、缺陷形成和杂质引入，因此合成的粉体具有较高的烧结活性。 本研究采用简易水热法、高压水热法和微波水热法合成了铌酸锂纳米粉体。考察不同反应温度、反应时间、化学配比、原料浓度、表面活性剂等对合成粉体的影响，通过XRD、SEM、TEM、FIIR、TG-DSC等方法对产物进行表征，获得以下结果： 1.简易水热法的最佳工艺条件为：反应温度为260℃、反应时间为24h、原料浓度为0.1mol/L、化学配比（Li/Nb）为1.10。合成的纳米铌酸锂粒子大致呈规则的四方柱形和球形，粒度在50-200nm之间；激光粒度分布分析表明：其分布均匀，团聚体约89nm左右。 2.高压水热法的最佳工艺条件为：水热反应温度为260℃、反应时间为22h、Li/Nb为1.10、原料浓度为1.0mol/L、搅拌速度为300r/min、SDS含量为0.5％。高压水热法合成的纳米铌酸锂粉体为球形，其粒度约为86nm，纳米铌酸锂球形粒子之间存在一定程度的团聚。但高压水热法合成的纳米铌酸锂粉体粒度分布均匀。 3.以水热法合成的粉体为原料进行烧结实验。通过XRD、SEM等手段，对不同烧结温度下LiNbO3陶瓷的组织形貌进行研究，并测试了压电性能。研究表明：水热粉体表现出良好的烧结性能，在烧结温度为1080℃时，可以得到烧结致密的铌酸锂陶瓷；烧结温度对铌酸锂烧结体的压电性能影响较大，1100℃下得到的烧结体压电性能较好，压电常数为60pC/N。 |
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matureboy
铁杆木虫 (正式写手)
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★ ★
ninghx(金币+2,VIP+0):翻译的不错，谢谢楼主！
ninghx(金币+2,VIP+0):翻译的不错，谢谢楼主！
| the optimum conditions of simple hydrothermal synthesis are : the reaction temperature is 260 ℃, and the reaction time is 24 h,the concentration of raw materials is 0.1mol/L, the ration of chemical reagents (Li / Nb)is 1.10.The Synthesized LiNbO3 nano-particles is generally square column aspect and spherical,the size of particles is between 50-200 nm. The analysis of laser particle showed that: the distribution is adqulis, the size of coacervate is 89 nm. |
3楼2008-04-06 19:35:14
zj19820305
金虫 (正式写手)
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ninghx(金币+5,VIP+0):翻译的挺好的，谢谢！
ninghx(金币+5,VIP+0):翻译的挺好的，谢谢！
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Since the policy of plumbum-forbiddion was released by the EU, there have been more and more serious competitions about the research and exploration of the leadless piezoelectric ceramics. LiNbO3 Ceramics have been attracted the extensive attentions of the researchers from all over the world due to their better properties. In recent years, wet chemical method has been quicklly developed in the synthesis of ceramic powers in order to produce nano-scale ceramics with homogeneous compositions and small crystals. Hydrothermal Synthesis is one of the wet chemical methods, and the ceramic powders obtained according to this method have higher calcined activatity because they need not high-temperature calcination, and the crystal growth with large scale, the formation of defect and the introduction of impurities can be avoided. In this work, simple hydrothermal synthesis, high pressure hydrothermal synthesis and microwave hydrothermal synthesis methods were introduced to produce LiNbO3 nano power. And the effect of reaction temperature, reaction time, the ration of chemical reagents, the concentrations of the start materials, the surfactant on the properties of nano powder, and the products were characterized by XRD, SEM, TEM, FTIR and TG-DSC, and the results were obtained as followings: 有点事情，先给这一段吧^_^ |
2楼2008-04-06 16:25:03
zj19820305
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2 the optium conditions of the high pressure hydrothermal process: the hydrothermal reaction temperature was 260℃, reaction time 22h, the ratio of Li/Nb 1.10, concentration of start material 1.0mol/L, stiring rate 300r/min, SDS content 0.5 %. The LiNbO3 nano powder obtained by high pressure hydrothermal synthesis was spheric in shape with particle diameter of 86nm, which was uniformly distributed with aggregations in the nano particles to some degree. 3 Calcination of the nano powder obtained through hydrothermal method. The microstructure and morphology of LiNbO3 ceramic calcined under different temperatures was studied by XRD,SEM characterizations, and its piezoelectricity was also tested. It is shown that, hydrothermal powders exhibited good calcination properties, and with calcined temperature 1080℃, the compacted LiNbO3 ceramic with high density was obtained. The calcined temperature had a larger effect on the piezoelectricity of the calcined bulk of LiNbO3. LiNbO3 obtained through calcination below 1100℃ had better piezoelectricity with piezoelectric constant of 60pC/N. |
4楼2008-04-07 20:26:06
