[摘要] SrMoO4 是一种有着白钨矿结构的钼酸盐,具有四方晶体对称

[Abstract] SrMoO4 ​​is a molybdate with scheelite structure, with tetragonal crystal symmetry, strong physical and chemical stability, and can be used as a matrix for luminescent materials. <br>In this paper, SrMoO4 ​​was successfully prepared by using low temperature combustion method, using urea as fuel, and the preparation process of low temperature combustion method and the luminescence performance of SrMoO4 ​​were studied in depth. The samples were measured and analyzed using X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and fluorescence spectroscopy (PL). <br>The content of the thesis mainly includes the following aspects: <br>1. SrMoO4 ​​crystals are prepared by low temperature combustion method, and the samples are analyzed and measured by X-ray diffractometer. According to the phase composition of the sample, it is concluded that the SrMoO4 ​​crystal has a unique structure and stable physical and chemical properties. 800 ℃ is the optimal temperature for synthesizing SrMoO4, and 3: 1 is the optimal ratio of urea to the matrix material SrMoO4. <br>2. Prepare SrMoO4 ​​crystal by low temperature combustion method, and analyze the morphology of the sample by scanning electron microscopy. The conclusion is that the synthetic product is strip-shaped particles, the thickness of the particles is relatively uniform, the average length is 8 um, the width is 3 um, and the thickness is 0.5 um. <br>3. Prepare SrMoO4 ​​crystal by low temperature combustion method, and study the excitation spectrum of the sample by fluorescence spectrometer. It is concluded that the excitation spectrum of the SrMoO4 ​​crystal is mainly composed of a broadband excitation peak between 200 and 360 nm, and the highest peak is near 300 nm, because the electron absorption photon of the 2p orbit of the O atom transitions to the 4d empty orbit of the Mo atom . <br>4. Preparation of SrMoO4 ​​by low temperature combustion method, using first principles to theoretically study the electronic structure and optical properties of the sample. SrMoO4 ​​was found to have a compound with a direct band gap of 4.389 eV. The p orbital of the oxygen atom will hybridize with the d orbital of the molybdenum atom, and eventually MoO42- anion will be formed. <br><br>Keywords: scheelite crystal; SrMoO4; low temperature combustion method; luminescence

(Summary) SrMoO4 is a tantalum with a white tungsten ore structure, with quadricecity crystal symmetry, strong physical and chemical stability, can be used as a substrate of luminescent materials.<br>This paper uses low-temperature combustion method, using urea as the fuel to successfully prepare SrMoO4 and the preparation process of low-temperature combustion method, and SrMoO4 luminescence performance in-depth research. The sample was measured and analyzed using X-ray powder diffraction (XRD), transmission mirror (TEM) and fluorescence spectroscopy (PL).<br>The content of the paper is mainly in the following aspects:<br>1. SrMoO4 crystals are prepared by low-temperature combustion method, and samples are analyzed and measured by X-ray diffraction instrument. According to the material composition of the sample, it is concluded that SrMoO4 crystals have a unique structure and stable physical and chemical properties, 800 degrees C is the optimal temperature for the synthesis of SrMoO4, and 3:1 is the best ratio of urea to the matrix substance SrMoO4.<br>2. SrMoO4 crystals are prepared by low-temperature combustion method, and the sample is analyzed by scanning an electro-mirror instrument. The conclusion is that the synthetic product is a bar particle with a uniform thickness, with an average length of 8 um, a width of 3 um and a thickness of 0.5 um.<br>3. SrMoO4 crystals are prepared by low-temperature combustion method, and the excitation spectroscopy of the sample is studied by a fluorescent spectrometer. It is concluded that the SrMoO4 crystal excitation spectrum is mainly composed of broadband excitation peaks between 200 and 360 nm, and the peak is located near 300 nm, because the electron absorption of photons in the 2p orbit of the O atom is moved to the 4d orbit of the Mo atom.<br>4. SrMoO4 is prepared by low-temperature combustion method, and the electronic structure and optical properties of the interpretation sample are studied theoretically using the principle of first nature. SrMoO4 was found to have a 4.389 eV direct band gap compound. Where the p-orbit of the oxygen atom will become hybridized with the d-orbit of the molybdenum atom, and the MoO42-anion will eventually form.<br><br>Keywords: White Tungsten Crystal; SrMoO4; Low Temperature Burning; Glow

Abstract: SrMoO4 is a kind of molybdate with Scheelite structure. It has tetragonal crystal symmetry, strong physical and chemical stability, and can be used as the matrix of luminescent materials.<br>In this paper, SrMoO4 was successfully prepared by low temperature combustion method with urea as fuel, and the preparation process and luminescent properties of SrMoO4 were studied. The samples were measured and analyzed by XRD, TEM and pl.<br>The main contents of this paper are as follows:<br>1. SrMoO4 crystal was prepared by low temperature combustion method. The sample was analyzed and measured by X-ray diffraction. According to the phase composition of the sample, SrMoO4 crystal has unique structure and stable physical and chemical properties. 800 ℃ is the best temperature to synthesize SrMoO4, and 3:1 is the best ratio of urea and SrMoO4.<br>2. SrMoO4 crystal was prepared by low temperature combustion method. The morphology of the sample was analyzed by SEM. The conclusion is that the synthetic product is strip-shaped particles with uniform thickness, average length of 8 um, width of 3 um and thickness of 0.5 um.<br>3. SrMoO4 crystal was prepared by low temperature combustion method. The excitation spectrum of the sample was studied by fluorescence spectrometer. It is concluded that the excitation spectrum of SrMoO4 crystal is mainly composed of a broad band excitation peak between 200 and 360 nm, and the highest peak is near 300 nm, because the electron absorption photon of 2p orbit of O atom transitions to 4D space orbit of Mo atom.<br>4. SrMoO4 was prepared by low temperature combustion method, and the electronic structure and optical properties of the interpreted samples were studied by the first principle. SrMoO4 has a 4.389 EV direct band gap compound. The p orbital of oxygen atom will be hybridized with the d orbital of molybdenum atom, and finally MoO42 anion will be formed.<br>Keywords: scheelite crystal; SrMoO4; low temperature combustion; luminescence