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Muhamad Ikhlasul Amal,이상현,김규호 한국물리학회 2014 Current Applied Physics Vol.14 No.7
The pentenary system, Cu2ZnSn(SxSe1x)4 (CZTSSe), is a promising alternative for thin film solar cells. In this study, CZTSSe thin films were prepared using a two-stage process involving the thermal diffusion of sulfur (S) and selenium (Se) vapors into sputtered metallic precursors at approximately 450 C. The effects of the sulfur content on the composition, structure, optical and electrical characteristics of the CZTSSe thin films were investigated. The films showed a kesterite structure with a predominant (112) orientation. X-ray diffraction and Raman spectroscopy confirmed the formation of a single phase CZTSSe compound. The band gap was dependent on the sulfur content and was calculated to be 1.25 eV, 1.33 eV and 1.40 eV for CZTSSe films with a S/(S þ Se) ratio of 0.3, 0.5 and 0.7, respectively. All films exhibited ptype semiconductor properties.
Synthesis and Sinterability of Hydroxyapatite from Fishery by-products
Wibisono, Yusuf,Dwijaksara, Ni Luh Bella,Widayatno, Wahyu Bambang,Wismogroho, Agus Sukarto,Amal, Muhamad Ikhlasul,Rochman, Nurul Taufiqu,Nishimura, Toshiyuki,Noviyanto, Alfian The Korean Ceramic Society 2018 한국세라믹학회지 Vol.55 No.6
Hydroxyapatites (HAps) were synthesized using the powdered waste of fishery products, i.e., fish scales and crab shells, as starting materials. HAp was synthesized by a wet-chemistry method followed by calcination at 600 and $800^{\circ}C$. Calcined crabshell powder revealed a single HAp phase and fine powder, while calcined fish-scale powder showed a ${\beta}-TCP$ secondary phase, even at the higher calcination temperature. Dense HAp pellets were obtained from the crab-shell powder by spark plasma sintering at $1000^{\circ}C$ for 10 min under applied pressures of 40 and 80 MPa in a vacuum state, giving sample densities of 2.93 and $3.06g/cm^3$, respectively. The estimated grain size of HAp was $448{\pm}96$ and $283{\pm}59nm$ for applied pressures of 40 and 80 MPa, respectively. In contrast, the HAp obtained using the pressureless sintering technique showed excessive grain growth without further densification.
Ceramic composites derived from polysilazane with the addition of silicon carbide
Alfian Noviyanto,Amirudin Wibowo,Galuh Sukmarani,Retno Kusumaningrum,Fiqhi Fauzi,Alvin Muhammad Habieb,Muhamad Ikhlasul Amal,Nurul Taufiqu Rochman 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3
Ceramic composites from the polysilazane with the addition of silicon carbide (SiC) was successfully sintered by a hot pressingfurnace at 1,600-1,800 ºC for 1 h under the applied pressure of 20 MPa in a nitrogen atmosphere. The addition of SiC did notinfluence the densification of sintered polysilazane. However, the phases generated during sintering were affected by theaddition of SiC, resulting in the multi-phases of sintered polysilazane/SiC composite. The formation of SiC, Si3N4, Si2N2O, andSiO2 phases were observed in the sintered polysilazane/SiC composite. The highest hardness of sintered polysilazane wasobtained with the addition of SiC sinter at 1,700 ºC, i.e., 24.3 ± 1.1 GPa, and decreased to 21.8 ± 0.7 GPa at 1,800 ºC. Thisis due to the sintered polysilazane/SiC composite at 1,700 ºC possess fine microstructure compared to 1,800 ºC. Meanwhile,the sintered polysilazane experienced significant grain growth at 1,700 ºC, thus the hardness of this sample was lower thansintered polysilazane/SiC composite.