本實驗著力於以化學共沉法製備不同比例的鑭銦鋯和鑭鎵鋯氧化物陶瓷粉末，此乃由於化學共沉法具有高均勻性、高反應性、高品質，以及精確的化學計量比；並探討此化合物的合成方式以及特性分析。
以化學共沉法製得鑭銦鋯和鑭鎵鋯兩著之前導化合物，經冷凍乾燥後，未含鋯者分別於1100℃煆燒2小時，900℃煆燒4小時由XRD分析得知其主要化合物分別為LaInO3和LaGaO3。將煆燒後之含鋯產物，壓錠後，於各溫度下燒結8小時，經XRD分析得知，其主要產物分別為LaInO3、La2Zr2O7和LaGaO3、La2Zr2O7混合物。

利用LCR測量儀測量其電容值經公式換算成介電常數知其介電常數均不甚高，LaInO3部份均在40以下，而LaGaO3在60以下。而兩著的介電常數均隨著試片燒結溫度和LCR量測頻率的升高而降低。

由維克氏硬度測量儀分析結果得知，其硬度隨著燒結溫度的升高而增加；而添加鋯的確可以改善LaInO3和LaGaO3的硬度。兩者之最佳添加量均為1mole%。

利用磁性測量儀量測試樣之磁化係數與溫度關係變化之情形，知其均為具反磁性物質。

Chemical coprecipitation has high homogeneity, high reactivity, high quality and exact stochiometry. The goal of this study is that the lanthanum-indium /gallium/-
zirconium oxide powders were prepared by coprecipitation method. The synthesis, characterization and electrical properties of the above compounds were investigated.
The precursors of lanthanum-indium-zirconium and lanthanum –gallium-
zirconium oxide with OH- ligands were prepared by coprecipitation. After freeze drying, the precursors were calcined at 1100 ℃ for 2 h and were calcined at 900 ℃ for 4 h to obtain the corresponding compounds without zirconium respectively. It indicated from XRD patterns that the major compounds were LaInO3 and LaGaO3, respectively.
Calcined powders were pressed into disks and then were sintered for 8h at various temperatures. From XRD patterns, it revealed that they formed solid solution systems of LaInO3-La2Zr2O7 and LaGaO3 -La2Zr2O7,respectively.
LCR meter was used to measure the electrical capacity of the samples. Dielectric constants were calculated from the electrical capacity via the formula. It was found that both of the two systems have low dielectric constants. The dielectric constants of LaInO3-La2Zr2O7 system were all below 40 and those of LaGaO3-La2Zr2O7 system were all below 60. The dielectric constant decreases with increasing sintering temperature and frequency, measured by the LCR.
The hardness of sintered bodies increases with increasing the sintering temperature. The mechanical properties of LaInO3 and LaGaO3 were truly improved by adding zirconium. The optimal additions of zirconium are 1mole% for both of the above systems.

From the variations of susceptibility with temperature analyzed by SQUID, we found that products exhibit diamagnetisim.

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