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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Effects of magnesium niobate precursor and calcination condition on phase formation and morphology of lead magnesium niobate powders
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Effects of magnesium niobate precursor and calcination condition on phase formation and morphology of lead magnesium niobate powders

机译：铌酸镁前驱体和煅烧条件对铌酸铅镁粉的相形成和形貌的影响

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摘要

A perovskite phase of lead magnesium niobate, Pb(Mg_(1/3)Nb_(2/3))O_3 or PMN, powders has been synthesized by a rapid vibro-milling technique. Both columbite MgNb_2O_6 and corundum Mg_4Nb_2O_9 have been employed as magnesium niobate precursors, with the formation of the PMN phase investigated as a function of calcination conditions by thermal gravimetric and differential thermal analysis (TG-DTA) and X-ray diffraction (XRD). The particle size distribution of the calcined powders was determined by laser diffraction technique. Morphology, crystal structure and phase composition have been determined via a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy-dispersive X-ray (EDX) techniques. The magnesium niobate precursor and calcination condition have been found to have a pronounced effect on the phase and morphology evolution of the calcined PMN powders. It is seen that optimisation of calcination conditions can lead to a single-phase PMN in both methods. However, the formation temperature and dwell time for single-phase PMN powders were lower for the synthetic method employing a columbite MgNb_2O_6 precursor.
机译：铌酸铅镁的钙钛矿相Pb（Mg_（1/3）Nb_（2/3））O_3或PMN粉末是通过快速振动研磨技术合成的。钴锰矿MgNb_2O_6和刚玉Mg_4Nb_2O_9均已用作铌酸镁前体，并通过热重和差热分析（​​TG-DTA）和X射线衍射（XRD）研究了煅烧条件对PMN相形成的影响。通过激光衍射技术确定煅烧粉末的粒度分布。形态，晶体结构和相组成已通过扫描电子显微镜（SEM），透射电子显微镜（TEM）和能量色散X射线（EDX）技术的组合确定。已经发现铌酸镁前体和煅烧条件对煅烧的PMN粉末的相和形态演变具有显着影响。可以看出，在两种方法中，煅烧条件的优化均可导致单相PMN。然而，对于采用钴钴矿MgNb_2O_6前体的合成方法，单相PMN粉末的形成温度和停留时间较低。

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