Journal of The Korean Ceramic Society 

About: Journal of The Korean Ceramic Society is an academic journal. The journal publishes majorly in the area(s): Sintering & Ceramic. It has an ISSN identifier of 1229-7801. Over the lifetime, 4616 publications have been published receiving 13053 citations.

Manganese 色料 散考

Abstract: • Appearance: Manganese, AAS standard solution, Specpure®, Mn 1000μg/ml; Manganese, Oil based standard solution, Specpure®, Mn 5000μg/g; Manganese powder, -140+325 mesh, 99.6% (metals basis); Manganese sputtering target, 76.2mm (3.0in) dia x 6.35mm (0.250in) thick, 99.95% (metals basis); Manganese sputtering target, 76.2mm (3.0in) dia x 3.18mm (0.125in) thick, 99.95% (metals basis); Manganese sputtering target, 50.8mm (2.0in) dia x 6.35mm (0.250in) thick, 99.95% (metals basis); Manganese sputtering target, 50.8mm (2.0in) dia x 3.18mm (0.125in) thick, 99.95% (metals basis); Manganese, Quant® Test Strips; Manganese powder, -325 mesh, 99.95% (metals basis); Manganese pieces, irregular, 99.95% (metals basis); Manganese granules, 0.8-10mm (0.03-0.40in), 99.98% (metals basis); Manganese, plasma standard solution, Specpure®, Mn 10,000μg/ml; Manganese, Oil based standard solution, Specpure®, Mn 1000μg/g; Manganese, plasma standard solution, Specpure®, Mn 1000μg/ml; Manganese powder, -325 mesh, 99.3% (metals basis); Manganese pieces, irregular, 99.9% (metals basis); Manganese, AAS standard solution, Specpure®, Mn 1000μg/ml; Manganese, Oil based standard solution, Specpure®, Mn 5000μg/g; Manganese powder, -140+325 mesh, 99.6% (metals basis); Manganese sputtering target, 76.2mm (3.0in) dia x 6.35mm (0.250in) thick, 99.95% (metals basis); Manganese sputtering target, 76.2mm (3.0in) dia x 3.18mm (0.125in) thick, 99.95% (metals basis); Manganese sputtering target, 50.8mm (2.0in) dia x 6.35mm (0.250in) thick, 99.95% (metals basis); Manganese sputtering target, 50.8mm (2.0in) dia x 3.18mm (0.125in) thick, 99.95% (metals basis); Manganese, Quant® Test Strips; Manganese powder, -325 mesh, 99.95% (metals basis); Manganese pieces, irregular, 99.95% (metals basis); Manganese granules, 0.8-10mm (0.03-0.40in), 99.98% (metals basis); Manganese, plasma standard solution, Specpure®, Mn 10,000μg/ ml; Manganese, Oil based standard solution, Specpure®, Mn 1000μg/g; Manganese, plasma standard solution, Specpure®, Mn 1000μg/ml; Manganese powder, -325 mesh, 99.3% (metals basis); Manganese pieces, irregular, 99.9% (metals basis); A lustrous, brittle, silvery solid.; silvery or greyish flakes or chunks

현무암을 이용한 Glass-Ceramics

Abstract: Crystallization phenomena of glasses of fused natural basalt rocks were studied by DTA, X-ray phase analysis, electron microscopy, and other techniques. Crystallization was catalyzed by the addition of either chromite ore or P₂O 5 , both up to 5 wt %. Various heat treatments were used, and their influences on controlling the microstructures and properties of the products were studied to develop high strength glass-ceramic material of the CaO-Al₂O₃(Fe₂O₃)-MgO(FeO)-SiO₂ system from the domestic basalts. Magnetite precipitates were found to be a nucleation initiator in every case of the crystallization. Diopside, anorthite, clinoenstatite and monticellite were identified as silicate crystalline phases contained in the crystallized products. The crystallite size was in the range of 0.1-2.5㎛. The fine crystallites were approximately cubic, but large crystallites were either plate or needle shape. The thermal expansion coefficient, microhardness and modulus of rupture of glass-ceramics were ranged from 78.5 to 81.8×10 -7 ㎝/㎝/℃, from 820 to 930㎏/㎟, and from 1800 to 2800㎏/㎠, respectively.

Recent Developments in Piezoelectric Crystals

Abstract: Piezoelectric materials are essential parts of the electronics and electrical equipment used for consumer and industrial applications, such as ultrasonic piezoelectric transducers, sensors, actuators, transformers, and resonators. In this review, the development of piezoelectric materials and the figures of merit for various electromechanical applications are surveyed, focusing on piezoelectric crystals, i.e., the high-performance relaxor-PbTiO3-based perovskite ferroelectric crystals and nonferroelectric hightemperature piezoelectric crystals. The uniqueness of these crystals is discussed with respect to different usages. Finally, the existing challenges and perspective for the piezoelectric crystals are discussed, with an emphasis on the temperature-dependent properties, from cryogenic temperatures up to the ultrahigh-temperature usage range.

Millimeter-wave Dielectric Ceramics of Alumina and Forsterite with High Quality Factor and Low Dielectric Constant

Abstract: Millimeter-wave dielectric ceramics have been used like applications for ultrahigh speed wireless LAN because it reduces the resources of electromagnetic wave, and Intelligent Transport System (ITS) because of straight propagation wave. For millimeter-wave, the dielectric ceramics with high quality factor (Q·f), low dielectric constant(e r ), and nearly zero temperature coefficient of resonant frequency (τ f ) are needed. No microwave dielectric ceramics with these three properties exist except Ba(Mg 1/3 Ta 2/3 )O₃ (BMT), which has a little high τ f . In this paper, alumina (Al₂O₃) and forsterite (Mg₂SiO₄), candidates for millimeter-wave applications, were studied with an objective to get high Q·f and early zero τ f . For alumina ceramics, Q·f more than 680,000 GHz was obtained but it was difficult to obtain nearly zero τ f . On the other hand, for forsterite ceramics, Q·f was achieved from 10,000 GHz of commercial forsterite to 240,000 GHz of highly purified MgO and SiO₂ raw materials, and τ f was reduced a few by adding TiO₂ with high positive τ f .

Electrospun Metal Oxide Composite Nanofibers Gas Sensors: A Review

Abstract: Nanostructured materials have attracted considerable research interest over the recent decades because of their potential applications in nanoengineering and nanotechnology. On the other hand, the developments in nanotechnology are strongly dependent on the availability of new materials with novel and engineered morphologies. Among the novel nanomaterials reported thus far, composite nanofibers (NFs) have attracted considerable attention in recent years. In particular, metal oxide NFs have great potential for the development of gas sensors. Highly sensitive and selective gas sensors can be developed by using composite NFs owing to their large surface area and abundance of grain boundaries. In composite NFs, gas sensing properties can be enhanced greatly by tailoring the conduction channel and surface properties by compositional modifications using the synergistic effects of different materials and forming heterointerfaces. This review focuses on the gas sensing properties of composite NFs synthesized by an electrospinning (ES) method. The synthesis of the composite NFs by the ES method and the sensing mechanisms involved in different types of composite NFs are presented along with the future perspectives of composite NFs.