【摘要】：多鐵性材料是指具有鐵電性、鐵磁性及鐵彈性中兩種或者兩種以上基礎(chǔ)鐵性的材料。作為多鐵性材料的典型代表,BiFe03是極少數(shù)在室溫下即可表現(xiàn)出多鐵性能的材料,潛在應(yīng)用廣泛,引起廣大學(xué)者的關(guān)注。本文以鐵酸鉍及其復(fù)合材料為研究對(duì)象,對(duì)熔鹽法制備鐵酸鉍粉體工藝、水熱法合成超細(xì)鈦酸鍶粉體工藝及其二者復(fù)合材料的制備工藝進(jìn)行了細(xì)致研究,并探討鈦酸鍶含量對(duì)鐵酸鉍基復(fù)合材料性能的影響。論文主要內(nèi)容如下： 1)緒論主要綜述了多鐵性材料的定義、分類及其基本性質(zhì)、鐵酸鉍的研究現(xiàn)狀以及選擇本課題的原因,并確定研究?jī)?nèi)容。 2)以Bi2O3,Fe2O3為反應(yīng)原料,采用KCl-KBr,熔鹽法合成亞微米單晶BiFeO3材料。研究了熔鹽種類、熔鹽用量、煅燒溫度及煅燒時(shí)間等對(duì)BiFeO3粉體制備的影響。結(jié)果表明：采用復(fù)合熔鹽KCl-KBr,控制復(fù)合熔鹽與反應(yīng)原料質(zhì)量比為1.0、750～800℃煅燒,可以制備出顆粒尺寸約為～0.6μm斜方六面體結(jié)構(gòu)BiFeO3單晶粉體材料�；谀０逍纬蓹C(jī)制,探討了熔鹽法制備BiFeO3的形成機(jī)理。 3)以K2TiO(C2O4)2·2H2O、Sr(NO3)2為反應(yīng)原料,以NaOH作為礦化劑,采用水熱法制備超細(xì)SrTiO3粉體材料。研究了反應(yīng)原料與礦化劑摩爾比、水熱反應(yīng)溫度及水熱反應(yīng)時(shí)間等對(duì)合成超細(xì)SrTiO3粉體的影響。通過(guò)XRD、SEM測(cè)試等手段綜合分析表明：當(dāng)采用反應(yīng)原料與礦化劑的摩爾比為1：6200℃保溫12h即可獲得晶體生長(zhǎng)完好、粒徑分布均勻的超細(xì)SrTiO3粉體,。 4)以水熱法制備的超細(xì)SrTiO3粉體、熔鹽法制備的亞微米BiFeO3粉體作為反應(yīng)原料,經(jīng)壓片、成型、燒結(jié)等工藝制備(1-x)BiFe03-xSrTi03(0.00≤x≤1.00)復(fù)合材料。研究了燒結(jié)工藝對(duì)(1-x)BiFe03-xSrTi03陶瓷材料致密度影響；探討了SrTiO3含量對(duì)(1-x)BiFeO3-xSrTiO3物相組成、介電常數(shù)及介電損耗、鐵電性能等的影響。結(jié)果表明：在制備(1-x)BiFe03-xSrTi03陶瓷材料時(shí),最佳燒結(jié)溫度隨SrTiO3含量增大而升高,其最佳燒結(jié)溫度區(qū)間為780-950℃；當(dāng)0.00≤x≤0.30時(shí),即隨著SrTiO3含量增大,BiFeO3由具有反鐵磁性能的斜方六面體正交結(jié)構(gòu)(R3c)轉(zhuǎn)變?yōu)轫槾帕⒎较嘟Y(jié)構(gòu),0.35≤x≤1.00時(shí),BiFeO3與SrTiO3兩相共存。介電性能、鐵電性能及鐵磁性能測(cè)試表明,SrTO3有助于提高樣品的介電性能、鐵電性能及鐵磁性能。
[Abstract]:Ferroelectric, ferromagnetic and ferroelastic materials are two or more basic iron materials. As a typical representative of multi-iron materials, BiFe03 is one of the few materials which can show the properties of multi-iron at room temperature. In this paper, the preparation of bismuth ferrate powder by molten salt, ultrafine strontium titanate powder by hydrothermal method and their composite materials were studied in detail. The effect of strontium titanate content on the properties of bismuth ferrate matrix composites was discussed. The main contents of this paper are as follows: 1) the introduction summarizes the definition, classification and basic properties of polyferric materials, the current research situation of bismuth ferrate and the reasons for choosing this topic. 2) Submicron single crystal BiFeO3 materials were synthesized by KCl-KBr, molten salt method using Bi2O3,Fe2O3 as raw material. The effects of kinds of molten salt, amount of molten salt, calcination temperature and calcination time on the preparation of BiFeO3 powder were studied. The results show that when the mass ratio of the compound molten salt to the raw material is 1.0750 鈩，

本文編號(hào)：2265635