發(fā)布時間：2018-06-18 12:57

  本文選題：高壓 + 阻抗譜��； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：關(guān)于克拉通破壞的機制通常有兩種觀點：拆沉機制和熱侵蝕機制，無論是哪種破壞機制都會涉及到下附的軟流層熔體的物理性質(zhì)。本文利用高壓原位測量技術(shù)測量了高壓下含水玄武巖玻璃的布里淵散射光譜和拉曼光譜以及交流阻抗譜，系統(tǒng)的研究了高壓下含水玄武巖玻璃的結(jié)構(gòu)。 （1）我們以氬氣為傳壓介質(zhì)測得了含水玄武巖玻璃的高壓布里淵散射圖譜，可以看到隨著壓力的增大橫波和縱波都向高頻移動，壓力的增大使波速增加。在壓力為7.1GPa左右聲速隨壓力變化關(guān)系的曲線斜率發(fā)生了明顯變化，樣品的絕熱剪切模量（G）、壓縮率（KS）以及密度隨壓力的變化關(guān)系符合二階相變特點。 （2）為了驗證含水玄武巖玻璃的高壓布里淵散射實驗中得到的二階相變點，，我們對含水玄武巖玻璃樣品進(jìn)行了拉曼光譜測量。從測得含水玄武巖玻璃的拉曼光譜和拉曼峰位隨壓力變化關(guān)系圖中可以看到：所加壓力達(dá)到8GPa左右時，O-Si(Al)-O伸縮振動峰和彎曲振動峰消失了，同時新的Si-O(nb)非橋氧振動峰出現(xiàn)，證明含水玄武巖玻璃在8GPa左右發(fā)生了二階相變。 （3）通過測量不同壓力下含水玄武巖玻璃的阻抗譜，研究了含水玄武巖玻璃在高壓下的電學(xué)性質(zhì)。從不同壓力下含水玄武巖玻璃的的阻抗譜圖中可以看出實驗中沒有測到晶界傳導(dǎo)的信號，所以總電阻也就是晶粒的電阻。7.8-8.9GPa的壓力范圍內(nèi)，樣品的電阻發(fā)生了突變，這與樣品在7.1GPa左右發(fā)生的二階相變對應(yīng)。
[Abstract]:There are usually two viewpoints on the mechanism of craton failure: delamination mechanism and thermal erosion mechanism, no matter which kind of failure mechanism is concerned with the physical properties of the underlying soft flow melt. Brillouin scattering spectra, Raman spectra and AC impedance spectra of aqueous basalt glasses under high pressure have been measured by high pressure in situ measurement technique. The structure of water-bearing basalt glass under high pressure is systematically studied. It can be seen that both the shear wave and the longitudinal wave move to high frequency with the increase of pressure, and the wave velocity increases with the increase of pressure. When the pressure is about 7.1 GPA, the slope of the curve of the relationship between the velocity of sound and the pressure changes obviously. The relation of the adiabatic shear modulus, compression ratio (KS) and density with pressure is in accord with the second order phase transition characteristic. In order to verify the second order phase transition point obtained in the high pressure Brillouin scattering experiment of water-bearing basalt glass, We have measured the Raman spectra of aqueous basalt glass samples. The Raman spectrum and Raman peak position of water-bearing basalt glass are measured. It can be seen that when the applied pressure reaches about 8 GPA, the stretching and bending vibration peaks of O-Si-Si-Al-O are disappeared, and the new Si-Onnb) non-bridged oxygen vibration peak appears. It is proved that the second order phase transition occurs in the water-bearing basalt glass at about 8 GPA. (3) the electrical properties of the water-bearing basalt glass under high pressure are studied by measuring the impedance spectra of the water-bearing basalt glass under different pressures. From the impedance spectra of water-bearing basalt glass under different pressures, we can see that there is no signal of grain boundary conduction in the experiment, so the total resistance, that is, the resistance of the grain is within the pressure range of 7.8-8.9 GPA, the resistance of the sample has a sudden change. This corresponds to the second order phase transition of the sample at about 7.1 GPA.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332

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相關(guān)期刊論文 前3條

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本文編號：2035562