本文選題：微波介質(zhì)陶瓷 + 拉曼光譜　； 參考：《山東師范大學(xué)》2015年碩士論文

【摘要】：微波介質(zhì)陶瓷是微波頻段（300MHz-30GHz）電路中的重要材料之一。因為微波器件信息容量大，方向性和穿透性強(qiáng)的特點，成為微波電容器、介質(zhì)天線等元器件的核心材料。隨著現(xiàn)在移動通訊技術(shù)對設(shè)備小型化和高頻化的要求，探索高介電常數(shù)，高品質(zhì)因數(shù)，低損耗以及低成本的微波介質(zhì)陶瓷材料成為近年來炙手可熱的研究焦點。 A(B1/2B1/2)O3和A(B1/3B2/3)O3型陶瓷在現(xiàn)實生活中的應(yīng)用有著很不錯的發(fā)展前景。它們本身具有特殊的結(jié)構(gòu)特征和原子排列方式，使它們在微波和毫米介電響應(yīng)方面有著出色的表現(xiàn)。而這種優(yōu)勢和它們的光子振動特性息息相關(guān)，樣品制備條件對光子特性的研究同時也有著重要影響。因此，，通過對微觀結(jié)構(gòu)的研究，可以探索新工藝新配方下的陶瓷的性能優(yōu)劣，為實現(xiàn)新型陶瓷的大批量應(yīng)用奠定基礎(chǔ)。 本文采用固相合成法制備了Ba(Zn1/3Nb2/3)O3-xCaTiO（3BZN-CT，x=0.0，0.30，0.60，0.75，0.90）和(1-x)Ba(Mg1/3Ta2/3)O3-xBa(Co1/3Nb2/3)O3（BMT-BCN，x=0.0，0.20，0.25，0.30，0.40）微波介質(zhì)陶瓷。通過不同的數(shù)據(jù)處理方式對XRD衍射，Raman散射以及FTIR反射光譜測試數(shù)據(jù)進(jìn)行處理和整理，同時與所測得的樣品的介電性能聯(lián)系起來進(jìn)行比對和研究。討論了BZN-CT陶瓷晶體結(jié)構(gòu)隨著A位Ca2+和B位Ti4+的取代而發(fā)生的變化與振動模式和結(jié)構(gòu)性能之間的關(guān)系以及B位Co2+和Nb5+取代對BMT-BCN陶瓷晶體微觀結(jié)構(gòu)和性能的影響。1. Ba(Zn1/3Nb2/3)O3-xCaTiO3陶瓷晶格振動光譜與結(jié)構(gòu)性能總結(jié) 1)將XRD數(shù)據(jù)與JCPDS卡片進(jìn)行比對，得到純的BZN陶瓷為立方有序結(jié)構(gòu)，系統(tǒng)的晶格對稱性隨CaTiO3添加組分的增大而降低，從開始的立方相在x=0.60時由贗立方相向六方相轉(zhuǎn)變，有序結(jié)構(gòu)由BZN的1:1有序向1:2有序轉(zhuǎn)變； 2)在拉曼光譜中，與1:2有序結(jié)構(gòu)相關(guān)的A1g(Nb)振動模在x=0.60處突然向高頻偏移，同時，F(xiàn)2g(O)振動模由于長程1:2有序的存在而發(fā)生了分裂； 3) F2g(O)振動模的半高寬的變化與損耗tan相同，與介電常數(shù)r相反，分別在x=0.60時達(dá)到最小值和最大值，而溫度系數(shù)卻與Eg(O)的拉曼位移變化一致，這說明在CaTiO3的摻雜量為60㳠時，BZN-CT陶瓷的介電性能達(dá)到最佳； 4)通過群論分析完成對紅外光譜的指認(rèn)，討論了在x≥0.60時300cm1和600cm1附近出現(xiàn)的新模式以及介電常數(shù)虛部中強(qiáng)度變化的分析和峰值頻率與介電性能的研究。2.(1-x)Ba(Mg1/3Ta2/3)O3-xBa(Co1/3Nb2/3)O3陶瓷晶格振動光譜與結(jié)構(gòu)性能總結(jié) 1)通過JCPDS卡片與XRD測試數(shù)據(jù)比對，BMT-BCN固溶體樣品被確定為六方有序結(jié)構(gòu)，且隨著Ba(Co1/3Nb2/3)O3摻雜量的增加，該體系的晶格對稱性降低，有序度也隨之降低。 2)拉曼光譜中，Eg(O)振動模的半高寬與介電常數(shù)r在x≤0.25成正相關(guān)，而在x≥0.25呈逆相關(guān)；損耗tan與F2g(O)和A1g(O)振動模式的半高寬在x≤0.25呈逆相關(guān)，在x≥0.25成正相關(guān)，容量溫度系數(shù)呈非線性變化，這均證明了在x=0.25時，BMT-BCN陶瓷固溶體的晶體結(jié)構(gòu)與介電性能達(dá)到最優(yōu)。 3)完成紅外光譜的指認(rèn)，得出x=0.25的BMT-BCN陶瓷的紅外光譜強(qiáng)度突然變小，其中一些振動模式甚至消失，最終得到此組分下的樣品具有更好的介電性能，證實了XRD以及拉曼研究結(jié)論的正確性。
[Abstract]:Microwave dielectric ceramics are one of the important materials in the microwave band (300MHz-30GHz) circuit. Because of the characteristics of high information capacity, direction and penetration, microwave devices have become the core materials of microwave capacitors, dielectric antennas and other components. With the requirements of miniaturization and high frequency of mobile communication technology, the high permittivity is explored. High quality factor, low loss and low cost microwave dielectric ceramic materials have become a hot research focus in recent years.
The application of A (B1/2B1/2) O3 and A (B1/3B2/3) O3 ceramics in real life has a very good prospect. They have special structural characteristics and atomic arrangement, which make them excellent in microwave and millimeter dielectric response. This advantage is closely related to their photon vibration characteristics, and the sample preparation strips are closely related. The research on the properties of the photons also has an important influence. Therefore, through the study of the microstructure, we can explore the performance and quality of the ceramics under the new technology and new formula, which lays the foundation for the realization of the large batch application of the new type of ceramics.
In this paper, Ba (Zn1/3Nb2/3) O3-xCaTiO (3BZN-CT, x=0.0,0.30,0.60,0.75,0.90) and (1-x) Ba (Mg1/3Ta2/3) O3-xBa (Co1/3Nb2/3) O3 (Co1/3Nb2/3) O3 microwave dielectric ceramics were prepared by solid phase synthesis. The relationship between the crystal structure of BZN-CT ceramics with the substitution of A bit Ca2+ and B bit Ti4+ and the relationship between the vibration mode and the structure and properties, and the effect of B bit Co2+ and Nb5+ on the microstructure and properties of the BMT-BCN ceramics crystal are discussed. The.1. Ba (Zn1) (Zn1) (Zn1) is considered as the.1. Ba (Zn1). Vibrational spectra and structural properties of /3Nb2/3) O3-xCaTiO3 ceramics
1) comparing the XRD data with the JCPDS card, the pure BZN ceramic is a cubic ordered structure. The lattice symmetry of the system decreases with the increase of the added component of the CaTiO3. The cubic phase from the beginning is transformed from the pseudo cubic phase to the six square phase, and the ordered structure transforms from the 1:1 order of BZN to the 1:2 orderly.
2) in the Raman spectrum, the A1g (Nb) vibration mode related to the ordered structure of 1:2 suddenly shifts to high frequency at x=0.60, while the F2g (O) vibration mode is split due to the existence of the long range 1:2 order.
3) the half width of the F2g (O) vibration mode is the same as that of the loss tan. Contrary to the dielectric constant R, the minimum and maximum values are reached at x=0.60, while the temperature coefficient is the same as that of the Eg (O). This shows that the dielectric properties of the BZN-CT ceramics are best when the amount of doping is 60?
4) the identification of infrared spectra is completed by group theory analysis. The new modes of 300cm1 and 600cm1 at x > 0.60 and the analysis of the intensity changes in the imaginary part of the dielectric constant and the study of the peak frequency and dielectric properties of the dielectric constant are discussed. The lattice vibration spectra and the structural properties of the.2. (1-x) Ba (Mg1/3Ta2/3) O3-xBa (Co1/3Nb2/3) O3 ceramics are summarized.
1) by comparing the JCPDS card with the XRD test data, the BMT-BCN solid solution sample is determined to be an ordered structure of six square, and with the increase of Ba (Co1/3Nb2/3) O3 doping, the lattice symmetry of the system decreases and the order degree decreases.
2) in the Raman spectrum, the half width of the Eg (O) vibration mode and the dielectric constant R are positively correlated with the x < 0.25, but the x > 0.25 is inverse correlation; the half width of the loss Tan and F2g (O) and A1g (O) vibration mode is inverse correlation to x < 0.25, and the capacity temperature coefficient is nonlinear. The crystal structure and dielectric properties are optimal.
3) completing the identification of infrared spectra, it is concluded that the infrared spectral intensity of x=0.25 BMT-BCN ceramics suddenly becomes smaller, and some of the vibration modes even disappear. Finally, the samples under this component have better dielectric properties, and the correctness of the XRD and Raman results is confirmed.
【學(xué)位授予單位】：山東師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ174.1

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