Phase Composition, Crystallite Size and Physical Properties of B2O3-added Forsterite Nano-ceramics

International Conference on Nanomaterials and Biomaterials 2017

材料科学;物理学;生物科学

Pratapa, S.^1 ; Chairunnisa, A.^1 ; Nurbaiti, U.^1,2 ; Handoko, W.D.^1

Department of Physics, Faculty of Mathematics and Sciences, Institute of Technology Sepuluh November (ITS), Jl. Arief Rahman Hakim, Surabaya

60111, Indonesia^1

Department of Physics, Faculty of Mathematics and Natural Sciences, Semarang State University, Jl. Raya Sekaran Gunung Pati, Semarang

50221, Indonesia^2

关键词: Apparent density;    Archimedes methods;    Average grain size;    Sintered samples;    Uni-axial pressing;    Vector network analyzers;    Weight fractions;    X ray diffractometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/350/1/012002/pdf
DOI  :  10.1088/1757-899X/350/1/012002

来源: IOP

【 摘 要 】

This study was aimed to know the effect of B2O3 addition on the phase composition, crystallite size and dielectric properties of forsterite (Mg2SiO4) nano-ceramics. It utilized a purified silica sand from Tanah Laut, South Kalimantan as the source of (amorphous) silica and a magnesium oxide (MgO) powder. They were thoroughly mixed and milled prior to calcination. The addition of 1, 2, 3, and 4 wt% B2O3 to the calcined powder was done before uniaxial pressing and then sintering at 950 °C for 4 h. The phase composition and forsterite crystallite size, the microstructure and the dielectric constant of the sintered samples were characterized using X-ray diffractometer (XRD), Scanning Electron Microscope (SEM) and Vector Network Analyzer (VNA), respectively. Results showed that all samples contained forsterite, periclase (MgO) and proto enstatite (MgSiO3) with different weight fractions and forsterite crystallite size. In general, the weight fraction and crystallite size of forsterite increased with increasing B2O3 addition. The weight fraction and crystallite size of forsterite in the 4%-added sample reached 99% wt and 164 nm. Furthermore, the SEM images showed that the average grain size became slightly larger and the ceramics also became slightly denser as more B2O3 was added. The results are in accordance with density measurements using the Archimedes method which showed that the 4% ceramic exhibited 1.845 g/cm3 apparent density, while the 1% ceramic 1.681 g/cm3. We also found that the higher the density, the higher the average dielectric constant, i.e. it was 4.6 for the 1%-added sample and 6.4 for the 4%-added sample.