本文選題：爆炸加工方法　切入點(diǎn)：超導(dǎo)材料　出處：《中北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：提高高溫超導(dǎo)材料的臨界轉(zhuǎn)變溫度一直是材料科學(xué)領(lǐng)域的研究熱點(diǎn),而Bi_2Sr_2CaCu_2O_(8+δ)(Bi2212)超導(dǎo)材料由于其臨界轉(zhuǎn)變溫度高、可塑性好、易加工成材更是得到了廣泛的關(guān)注和深入研究。本文采用一種新穎的方法,將爆炸加工技術(shù)和超導(dǎo)研究結(jié)合起來,利用炸藥爆炸瞬間產(chǎn)生的高溫、高壓作用于超導(dǎo)氧化物Bi2212,通過這種動(dòng)態(tài)高溫、高壓同時(shí)加載的方式,來改變和提高Bi2212超導(dǎo)體的性能。對(duì)爆炸前、后的樣品分別進(jìn)行了制樣和對(duì)比表征,得到以下結(jié)論:X-射線衍射(XRD)結(jié)果表明,爆炸加工后,原高溫超導(dǎo)多晶粉體由Bi2212單一相轉(zhuǎn)變?yōu)橛葿i2212超導(dǎo)相和Bi_2Sr_2CuO_(6+δ)(Bi2201)半導(dǎo)體相組成的混合相,透射電子顯微鏡(TEM)表征結(jié)果進(jìn)一步證實(shí)了這個(gè)結(jié)論;超導(dǎo)量子干涉儀磁強(qiáng)計(jì)(SQUID)和四探針法測(cè)電阻測(cè)量結(jié)果表明,超導(dǎo)臨界溫度Tc由爆炸前的84 K提高到了爆炸后的94 K,共提高10 K;場(chǎng)效應(yīng)晶體管室溫下的測(cè)試結(jié)果表明,爆炸前的樣品只表現(xiàn)出金屬特性,I-V曲線不隨偏壓有明顯的變化,而爆炸后的樣品則呈現(xiàn)出明顯的n型半導(dǎo)體特性,且開關(guān)比可以達(dá)到5。也就是說,爆炸加工,使得高溫超導(dǎo)體Bi2212的物性發(fā)生了明顯的變化。爆炸加載Bi2212的方法為研究和調(diào)控高溫超導(dǎo)材料提供了一種新的思路,是研究高溫超導(dǎo)材料一種行之有效的手段,同時(shí),也為研究其它對(duì)高溫和高壓敏感的材料提供了一個(gè)借鑒方法。
[Abstract]:Increasing the critical transition temperature of high temperature superconducting materials has always been a hot topic in the field of material science, while Bi_2Sr_2CaCu_2O_(8 未 / Bi2212) superconducting materials have good plasticity due to their high critical transition temperature. In this paper, a novel method is used to combine the explosive processing technology with the superconducting research to make use of the high temperature produced by the explosive explosion. High pressure acts on superconducting oxide Bi2212. The properties of Bi2212 superconductors are changed and improved by means of dynamic high temperature and high pressure loading simultaneously. The samples before and after explosion are prepared and compared. The following conclusions are obtained: (1) the results of X-ray diffraction (XRD) show that after explosive processing, the original high temperature superconducting polycrystalline powder is transformed from a single phase of Bi2212 to a mixed phase composed of Bi2212 superconducting phase and Bi_2Sr_2CuO_(6 未 ~ (2 +) Bi _ (2201) semiconductor phase. The results of transmission electron microscopy (TEM) characterization further confirm this conclusion, and the results of resistance measurement by means of a superconducting quantum interferometer magnetometer (squid) and a four-probe method show that, The superconducting critical temperature (Tc) was increased from 84 K before explosion to 94 K after explosion, a total increase of 10 K. The test results at room temperature of the FET show that the I-V curve of the sample before explosion only shows no obvious change with bias voltage. And the samples after explosion show obvious n-type semiconductor characteristics, and the switching ratio can reach 5. That is, explosive processing, The physical properties of high temperature superconductor Bi2212 have changed obviously. The method of explosive loading Bi2212 provides a new way to study and control high temperature superconducting materials, is an effective means to study high temperature superconducting materials, and at the same time, It also provides a reference method for the study of other materials sensitive to high temperature and high pressure.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM26

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