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首页> 外文会议>International conference on advanced ceramics and composites >EFFECTS OF Mg CONTENTS ON ZnAl_2O_4 THIN FILMS BY SOL GEL METHOD AND ITS APPLICATION
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EFFECTS OF Mg CONTENTS ON ZnAl_2O_4 THIN FILMS BY SOL GEL METHOD AND ITS APPLICATION

机译：溶胶凝胶法及溶胶凝胶法对Znal_2O_4薄膜的影响及其应用

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The need for miniaturization and weight reduction of GPS patch antennas have forced scientists to search for new microwave dielectric materials. A sol-gel method was used to prepare Zn_(1-x)Mg_xAl_2O_4 (x = 0.00, 0.05, 0.10, 0.20 & 0.30) thin films based microwave dielectric ceramics and GPS patch antenna. The structural, optical, chemical property and dielectric properties of (Mg/Zn)Al_2O_4 - based microwave dielectric ceramics have been investigated. It is confirmed that ZnAl_2O_4 was succesfully formed with Mg by the X-ray diffraction (XRD) and Fourier Transform Infra-red (FTIR) patterns. The XRD patterns displayed the standard face-centered cubic of (Mg/Zn)Al_2O_4. The addition of Mg decreased the crystallite size (19.2 to 12.9 nm) and lattice parameter (8.082 to 8.048 A), whiles the apparent density increase linearly. The FTIR spectrum shows the bonding of (Mg/Zn)Al_2O_4 occurred at 666 cm~(-1). By using ultra-violet (UV-Vis) spectrophotometer, the band gap (Eg) energy of undoped was observed slightly lower than the Mg-doped. The Atomic Force Microscopy (AFM) data shows the Root Mean Square (RMS) roughness decreased due to Mg increases. The material with a higher density is associated with high dielectric constant (ε_r), which is suitable for GPS patch antenna application. The dielectric constant (ε_r) of the films was characterized at certain frequency using LCR spectrometer. It also observed there is a steady decrease in ε_r with applied frequency for each sample. The GPS patch antenna was fabricate using the Zn_(1-x)Mg_xAl_2O_4. Finally, the measured magnitude of return loss at 1.5754 GHz meets the requirements of GPS application.
机译：对GPS贴片天线的小型化和重量减轻的需求已经强迫科学家寻找新的微波介质材料。使用溶胶 - 凝胶方法制备基于微波介质陶瓷和GPS贴剂天线的Zn_（1-x）Mg_Al_2O_4（X = 0.05,0.10,0.20＆0.30）薄膜。研究了（Mg / Zn）Al​​_2O_4的微波介质陶瓷的结构，光学，化学性质和介电性能。确认，Znal_2O_4由X射线衍射（XRD）和傅里叶变换红外（FTIR）图案成功地用Mg形成。 XRD模式显示了标准居高的（Mg / Zn）AL_2O_4的标准居高级。添加Mg的添加降低了微晶尺寸（19.2至12.9nm）和格子参数（8.082至8.048A），呈现线性的表观密度增加。 FTIR光谱显示（Mg / Zn）Al​​_2O_4的键合在666cm〜（-1）中。通过使用紫外（UV-VI-VI）分光光度计，观察到未掺杂的带隙（例如）能量略低于Mg掺杂。原子力显微镜（AFM）数据显示由于Mg增加，均方根（RMS）粗糙度降低。具有较高密度的材料与高介电常数（ε_R）相关联，其适用于GPS贴片天线应用。使用LCR光谱仪在某些频率表征膜的介电常数（ε_R）。它还观察到ε_R的ε_R稳定降低，每个样品施加频率。使用Zn_（1-x）mg_xal_2o_4来制造GPS贴片天线。最后，在1.5754 GHz的测量损耗的测量幅度符合GPS应用的要求。

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