TY - JOUR
T1 - Synthesis and characterization of silica sand-derived nano-forsterite ceramics
AU - Nurbaiti, Upik
AU - Darminto,
AU - Triwikantoro,
AU - Zainuri, Mochamad
AU - Pratapa, Suminar
N1 - Publisher Copyright:
© 2017 Elsevier Ltd and Techna Group S.r.l.
PY - 2018/4/1
Y1 - 2018/4/1
N2 - This paper reports the synthesis and structural, microstructure, and dielectric characterizations of nanosized forsterite powders and their ceramics. Forsterite powder was synthesized by the mechanical activation of starting materials magnesium oxide (MgO) and amorphous silica (SiO2) powders followed by calcination at 950 °C. The amorphous silica powder was obtained by processing local silica sand. The compound analysis of forsterite powder was performed by FTIR spectroscopy, phase analyses by XRD, and the particle size was found by TEM. The ceramics were synthesized by uniaxially pressing the powder and then sintering it at 950, 1050, 1150, and 1200 °C. Characterization of the ceramics included microstructure, diameter shrinkage, density, porosity, dielectric constant and quality factor. Results showed that the synthesized powder consisted of nano-sized (ca. 55 nm) forsterite (Mg2SiO4) as the main phase, accompanied by protoenstatite (MgSiO3), periclase (MgO), and low cristobalite (SiO2) as minor phases. The sintered ceramics exhibited improved forsterite weight fraction with a maximum of 99.3% after sintering at 950 °C. Furthermore, with the increase in sintering temperature from 950 to 1200 °C, the density of the ceramics increased from 1.6 to 2.5 g cm−3 and also led to grain growth from 56 to 277 nm. Furthermore, their 10-GHz dielectric constants εr' were relatively low, i.e., between 6.0 and 13.3. In addition, all the ceramic samples had a loss factor tan δ < 0.0004 and a quality factor Q×f>1000 GHz, which indicates that the dielectric properties of all the samples can be promoted as those of millimeter-wave candidate materials.
AB - This paper reports the synthesis and structural, microstructure, and dielectric characterizations of nanosized forsterite powders and their ceramics. Forsterite powder was synthesized by the mechanical activation of starting materials magnesium oxide (MgO) and amorphous silica (SiO2) powders followed by calcination at 950 °C. The amorphous silica powder was obtained by processing local silica sand. The compound analysis of forsterite powder was performed by FTIR spectroscopy, phase analyses by XRD, and the particle size was found by TEM. The ceramics were synthesized by uniaxially pressing the powder and then sintering it at 950, 1050, 1150, and 1200 °C. Characterization of the ceramics included microstructure, diameter shrinkage, density, porosity, dielectric constant and quality factor. Results showed that the synthesized powder consisted of nano-sized (ca. 55 nm) forsterite (Mg2SiO4) as the main phase, accompanied by protoenstatite (MgSiO3), periclase (MgO), and low cristobalite (SiO2) as minor phases. The sintered ceramics exhibited improved forsterite weight fraction with a maximum of 99.3% after sintering at 950 °C. Furthermore, with the increase in sintering temperature from 950 to 1200 °C, the density of the ceramics increased from 1.6 to 2.5 g cm−3 and also led to grain growth from 56 to 277 nm. Furthermore, their 10-GHz dielectric constants εr' were relatively low, i.e., between 6.0 and 13.3. In addition, all the ceramic samples had a loss factor tan δ < 0.0004 and a quality factor Q×f>1000 GHz, which indicates that the dielectric properties of all the samples can be promoted as those of millimeter-wave candidate materials.
KW - Millimeter-wave materials
KW - Nano-forsterite ceramics
KW - Sand-derived amorphous silica
UR - http://www.scopus.com/inward/record.url?scp=85039848514&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2017.12.198
DO - 10.1016/j.ceramint.2017.12.198
M3 - Article
AN - SCOPUS:85039848514
SN - 0272-8842
VL - 44
SP - 5543
EP - 5549
JO - Ceramics International
JF - Ceramics International
IS - 5
ER -