s的單調(diào)升高,Hc先升高后降低,Tc單調(diào)降低；隨著頻率的升高,介電常數(shù)呈現(xiàn)先升高后降低趨勢(shì),而介電損耗則呈先急速升高而后緩慢下降的趨勢(shì)。"/>

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煅燒條件對(duì)溶膠凝膠法制備Mn-Zn鐵氧體的組成及性能的影響
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中國(guó)計(jì)量大學(xué)材料科學(xué)與工程學(xué)院,中國(guó)計(jì)量大學(xué)材料科學(xué)與工程學(xué)院,中國(guó)計(jì)量大學(xué)材料科學(xué)與工程學(xué)院,中國(guó)計(jì)量大學(xué)材料科學(xué)與工程學(xué)院,中國(guó)計(jì)量大學(xué)材料科學(xué)與工程學(xué)院,

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Effect of the calcined conditions on composition and properties of Mn-Zn ferrites prepared by sol-gel method
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College of Materials Science and Engineering,China Jiliang University,Hangzhou,College of Materials Science and Engineering,China Jiliang University,Hangzhou,College of Materials Science and Engineering,China Jiliang University,Hangzhou,College of Materials Science and Engineering,China Jiliang University,Hangzhou,College of Materials Science and Engineering,China Jiliang University,Hangzhou,College of Materials Science and Engineering,Zhejiang University,Hangzhou

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    摘要:

    通過(guò)模板輔助溶膠凝膠法在不同的燒結(jié)氣氛和燒結(jié)溫度下制備出了一系列Mn-Zn鐵氧體納米粉體。利用XRD、TEM、VSM和阻抗分析儀等對(duì)材料的相組成、形貌和電磁性能進(jìn)行了表征。實(shí)驗(yàn)結(jié)果表明,僅有在573K預(yù)燒1h后在氮?dú)鈿夥罩徐褵臉悠肪哂屑饩Y(jié)構(gòu)且顆粒大小均勻；這為制備具有尖晶石結(jié)構(gòu)的Mn-Zn鐵氧體納米粉體提供了一條新的途徑。同時(shí)文中探討了了Mn-Zn鐵氧體在不同煅燒氣氛中的反應(yīng)機(jī)理。此外,煅燒溫度是影響尖晶石結(jié)構(gòu)的Mn-Zn鐵氧體材料性能的一個(gè)重要因素,隨著煅燒溫度的升高,晶粒尺寸逐漸變大,Ms的單調(diào)升高,Hc先升高后降低,Tc單調(diào)降低；隨著頻率的升高,介電常數(shù)呈現(xiàn)先升高后降低趨勢(shì),而介電損耗則呈先急速升高而后緩慢下降的趨勢(shì)。

    Abstract:

    A series of Mn-Zn ferrite particles was prepared by a template-assisted sol-gel method and calcined at 773, 973 and 1173 K in air, nitrogen and nitrogen after precalcination at 573 K for 1h in air respectively. The effects of calcined conditions on composition, morphology and properties of Mn-Zn ferrites were investigated by XRD, TEM, VSM and impedance analyzer. It was found that Mn-Zn ferrites with pure spinel structure, uniform size and morphology were obtained only in nitrogen after precalcination at 573 K for 1h in air, which provided a new way to prepare Mn-Zn ferrite nanoparticles with spinel structure. The reaction mechanisms of the Mn-Zn ferrites in different calcined atmospheres were analyzed. The calcined temperature had a major influence on the morphology and properties of the Mn-Zn ferrite particles with spinel structure obtained; and with the increasing of the calcination temperature, the particles in size became larger, Ms increased monotonically, Hc first increased and then decreased, Tc decreased monotonically. The permittivity first increased and then decreased, and the dielectric loss showed a sharp rise after slightly reducing trend with the increasing of frequency.

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孫玉坤,李冬云,王凡,徐揚(yáng),葛洪良,楊輝.煅燒條件對(duì)溶膠凝膠法制備Mn-Zn鐵氧體的組成及性能的影響[J].稀有金屬材料與工程,2018,47(S2):162~166.[Sun Yukun, Li Dongyun, Wang Fan, Xu Yang, Ge Hongliang, Yang Hui. Effect of the calcined conditions on composition and properties of Mn-Zn ferrites prepared by sol-gel method[J]. Rare Metal Materials and Engineering,2018,47(S2):162~166.]
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  • 收稿日期:2017-12-04
  • 最后修改日期:2017-12-04
  • 錄用日期:2018-02-01
  • 在線發(fā)布日期: 2018-11-01
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