Nanoneedles of Lanthanum Oxide (La2O3): A Novel Functional Material for Microwave Absorber Material

4th International Conference on Advanced Materials Science and Technology

Adi, W.A.^1 ; Wardiyati, S.^1 ; Dewi, S.H.^1

Centre for Science and Technology of Advanced Materials, BATAN, Kawasan Puspiptek, Serpong Tangerang Selatan Banten, Indonesia^1

关键词: Centrifugation methods;    Hydrolysis reaction;    Microwave absorbers;    Novel functional materials;    Reflection and transmission;    Synthesis and characterizations;    Vector network analyzers;    X ray diffractometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/202/1/012066/pdf
DOI  :  10.1088/1757-899X/202/1/012066

来源: IOP

【 摘 要 】

Synthesis and characterization of La2O3nanoneedles have been successfully carried out by using hydrolysis reaction with NH4OH as a solvent. La2O3was prepared from LaCl3solution. LaCl3was preheated on a hotplate and stirred by using a magnetic stirrer, then added solution of NH4OH 1 M with the variation speed drops of 3 ml, 6 ml and 9 ml to obtain white precipitation La(OH)3until a pH of 9. Stirring was continued until 1 hour. A white precipitate formed is separated from the effluent by centrifugation method with 3000 rpm and neutral pH. Then, the precipitate was dried in an oven at a temperature of 70 °C and sintered at 1000 °C to get La2O3nanoneedles. The identification of sample phase was carried out by using X-ray diffractometer (XRD). The refinement results of X-ray diffraction pattern shows that the samples have a single phase of La2O3. The morphology of the nanoneedles was observed by using the transmission electron microscope (TEM). Meanwhile, the reflection and transmission of electromagnetic wave were measured by using the vector network analyzer (VNA) at X-band frequency.