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Microwave Dielectric Ceramics with Rare-earth Elements (I)
히토시오사토,Isao Kagomiya,채기웅 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.6
Nearly half of the microwave dielectric materials include rare-earth elements based on a database presented by M. T. Sebastian. The presence of rare-earth elements helps to improve the microwave dielectric properties because the crystal structure is adjusted by the ionic radius of the rare-earth element. The microwave dielectrics are grouped by the crystal structure: (1) pseudotungstenbronze Ba<sub>6−3x</sub>R<sub>8+2x</sub>Ti<sub>18</sub>O<sub>54</sub> solid solutions, (2) homologous Ba<sub>n</sub>La<sub>4</sub>-Ti<sub>3+n</sub>O<sub>12+3n</sub> compounds (3) Y<sub>2</sub>BaCu<sub>2</sub>O<sub>5</sub> green phases, (4) aeschynite LaYTiO<sub>6</sub> and scheelite BaWO<sub>4</sub> compounds, (5) perovskite-type ABO<sub>3</sub> compounds, (6) garnet A<sub>3</sub>B'<sub>2</sub>B"<sub>3</sub>O<sub>12</sub> compounds. The materials group (3) - (6) are presented. We discuss the groups (1) - (2) in this paper, and presented in "Microwave Dielectric Ceramics with Rare-earth (II)".
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Synthesis of Forsterite with High Q and Near Zero TCf for Microwave/Millimeterwave Dielectrics
히토시오사토,Minato ANDO,Tsutomu TSUNOOKA 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.11
With the advent of ubiquitous age, the high quality dielectric materials have been required for the wireless communicationsavailable to the millimeterwave as well as microwave frequencies. The utilizable region for the frequency has been expanding tothe millimeter-wave region because of the shortage of radio frequency (RF) resources. These high frequencies would be expectedfor ultra high speed LAN, ETS and car anti-colision system on the intelligent transport system (ITS) and so on. Silicates aregood candidates for microwave/millimeterwave dielectrics, because of their low dielectric constant εr and high quality factor (HighQ). Forsterite (Mg2SiO4) is one of the silicates with low εr of 6.8 and Q·f of 240000 GHz.In this paper, we reviewed following three categories for synthesis of forsterite: (1) Synthesis of high Q forsterite(2) Adjust the temperature coefficient of resonant frequency TCf(3) Diffusion of SiO4- and Mg-ions on the formation of forsterite
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Mechanism of Piezoelectricity for Langasite Based on the Framework Crystal Structure
히토시오사토,Tsuyoshi Iwataki,Hiroki Morikoshi 한국전기전자재료학회 2012 Transactions on Electrical and Electronic Material Vol.13 No.2
Piezoelectric langasite crystals have superior properties such as high temperature performance and high quality Q and can be applied in combustion pressure sensors and surface acoustic wave (SAW) filters. Crystal growth,crystal structure and properties of langasite group are reviewed, and the mechanism of piezoelectricity of langasite is presented based on the crystal structure and deformation under high pressure. Finally, for the discovery of new piezoelectric materials, this paper presents the role of the framework, and recommends the search of framework crystal structure, because the characteristic of the mechanism exists on the framework of the crystal structure.
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