本文選題：功能材料 + 無鉛鐵電壓電材料　； 參考：《東北師范大學(xué)》2017年碩士論文

【摘要】：當(dāng)前,材料、能源和信息技術(shù)被人們譽為當(dāng)代社會文明發(fā)展的三大支柱。而在現(xiàn)代材料科學(xué)領(lǐng)域里,功能材料一直都是科學(xué)研究的重點和熱點。隨著科技的發(fā)展,當(dāng)今社會對性能優(yōu)異和功能各異的功能材料的需求越來越迫切。鐵電壓電材料作為一類重要的功能材料,由于其優(yōu)異的鐵電壓電性能、非線性光學(xué)性能和熱釋電性能等得到廣泛的關(guān)注和研究。鋯鈦酸鉛(PZT)作為傳統(tǒng)鐵電壓電材料的典型代表,對光電力熱的反應(yīng)都非常敏感,在光電響應(yīng)、吸收系數(shù)等諸多方面展現(xiàn)出優(yōu)異性能,但是其中含有的鉛對環(huán)境污染很大,同時對健康也有嚴(yán)重的危害。因此無鉛鐵電壓電材料吸引了廣大科研人員的興趣,其中,鉭鈮酸鉀(KTN)系列材料是一種重要的無鉛鐵電壓電材料。KTN材料由于其具有良好的非線性光學(xué)效應(yīng)、電光效應(yīng)和熱釋電效應(yīng),因此在計算機顯示、光存儲、光通訊以及光電子等領(lǐng)域展示良好的應(yīng)用前景。因此,探索和研究KTN鐵電材料及其基本性能,對于基礎(chǔ)研究和開拓新材料應(yīng)用領(lǐng)域均具有重要意義。本文在系統(tǒng)總結(jié)和分析了KTN鐵電壓電材料研究現(xiàn)狀的基礎(chǔ)上,主要研究了:1.堿金屬鉭鈮酸鹽材料的制備條件,利用熱失重分析等測試手段考察了反應(yīng)原料Li2CO3、K2CO3、Ta2O5和Nb2O5各自的熱解特性,對KT、KN、KTN和LN材料相應(yīng)的化學(xué)計量比配置原料粉體進行了20~1000℃溫度范圍內(nèi)的熱失重和熱流分析,探討了上述反應(yīng)過程中所涉及的機理,確定了相應(yīng)材料的最佳合成條件,并制備獲得了KT、KN、KTN和LN四種粉末材料。2.通過X射線衍射(XRD)研究了KT、KN、KTN和LN四種材料的晶體結(jié)構(gòu),研究發(fā)現(xiàn)KT為立方相,KN為正交相,KTN為四方相,LN為三角相,并分析了相應(yīng)的晶格參數(shù)。電鏡照片顯示所制備的材料為顆粒狀,尺寸在納米至亞微米之間,同時,通過對其復(fù)介電常數(shù)的測試和分析研究,發(fā)現(xiàn)在微波高頻率頻段范圍,系列材料具有較好的光電效應(yīng)。3.使用第一性原理對KT、KN、KTN和LN進行了幾何結(jié)構(gòu)優(yōu)化,能帶態(tài)密度分析,并對其介電常數(shù)進行計算,將結(jié)果與實驗結(jié)果進行比對分析,發(fā)現(xiàn)實驗測試結(jié)果與模擬結(jié)果吻合較好,驗證了KT、KN、KTN和LN測試結(jié)果的可靠性。計算和實驗結(jié)果均顯示:KTN系列材料在廣義電磁波微波頻率高頻范圍具有的介電常數(shù)特性,在光電響應(yīng)領(lǐng)域具有良好的應(yīng)用前景。
[Abstract]:At present, materials, energy and information technology are praised as the three pillars of the development of contemporary social civilization. In the field of modern material science, functional materials have always been the focus and hotspot of scientific research. With the development of science and technology, the demand for functional materials with excellent performance and different functions is becoming more and more urgent. As a kind of important functional materials, ferroelectric materials have been widely studied for their excellent ferroelectric properties, nonlinear optical properties and pyroelectric properties. As a typical representative of traditional ferroelectric materials, lead zirconate titanate (PZT) is very sensitive to photoelectrothermal reactions and exhibits excellent performance in many aspects, such as photoelectric response, absorption coefficient, etc. At the same time, there are serious health hazards. Therefore, lead-free ferroelectric materials have attracted the interest of many researchers. Among them, potassium tantalum niobate (KTNN) series is an important lead-free ferroelectric material. KTN has good nonlinear optical effect. The electro-optic effect and pyroelectric effect show a good prospect in the fields of computer display, optical storage, optical communication and optoelectronics. Therefore, it is of great significance to explore and study KTN ferroelectric materials and their basic properties for basic research and development of new materials applications. On the basis of systematically summarizing and analyzing the current research situation of KTN ferroelectric materials, this paper mainly studies the content of 1: 1. The preparation conditions of alkaline tantalum niobate materials were investigated by thermogravimetric analysis. The pyrolysis properties of Li2CO3 / K2CO3 / Ta2O5 and Nb2O5 were investigated. The thermogravimetric and heat flux analysis of the stoichiometric ratio of KTN KTN and LN materials was carried out in the temperature range of 20 鈩，

本文編號：1891335