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ErCO₂ Laves 화합물에서의 수소유기 비정질화에 관한 속도론적 연구
용윤중(Yoon Joong Yong),이재영(Jai Young Lee) 한국수소및신에너지학회 1993 한국수소 및 신에너지학회논문집 Vol.4 No.1
The kinetic studies of the hydrogen induced amorphization in ErCo₂ Laves phase is observed by the internal standard method using X-ray diffraction intensities. The activation energy and rate constant exponent for the amorphization in ErCo₂ are found to be 26 ?/mole and 0.78, respectively. From these results, it is believed that the mechanism of the hydrogen induced amorphization in ErCo₂ is related to the motion of Co atoms. Though there are many similar physical properties between ErCo₂ and ErNi?, the activation energy for the amorphizatin in ErCo₂ is larger than that in ErNi? and the amorphization rate in ErCo₂ is slower. It is suggested that these differences of activation energy for the hydrogen induced amorphization and the amorphization rate between ErCo₂ and ErNi? is due to the occurence of structural change on forming crystalline hydride.
다결정 AIN 박막을 이용한 800 MHz 대 표면탄성파 대역통과 필터개발에 관한 연구
이형규,최익권,용윤중,이재영 한국전자파학회 1997 한국전자파학회논문지 Vol.8 No.4
본 논문에서는 다결정 AlN 박막을 이용하여 800 MHz 대역의 표면탄성파 펼터를 시험제작한 연구 결과를 제시한다. 고주파 스퍼터링 방법에 의하여 실리콘 기판위에 증착시켜 X선 rocking curve의 반치폭이 $3^{\circ}$이고 박막 성장 방향으로 결정의 c축이 우선 배향된 박막을 얻었다. 임펄수 모텔링 기법을 이용하여 시험제작된 표면탄성파 필터는 중심주파수 865 MHz, 3 dB 대역폭 45 MHz이며 측정된 주파수 응답곡선으로부터 유도된 전기기계 결합상수는 0.8 %, 표면탄성파 전달속도는 5,709 m/s이다. We present the results on the applicability of the polycrystalline AIN thin films for a surface acoustic wave filter operating at 800 MHz frequency. The films show the FWHM of 3 .deg. from th X-ray rocking curve, which indicates that the c-axis of the films is pre- ferentially oriented along the growth direction. The fabricated band pass filters exhibit the center frequency of 865 MHz with 3dB band-width of 45 MHz. From the measured frequency response, the electro-mechanical coupling constant of 0.8% and the SAW velocity of 5,709 m/s are obtained. Thus, we conclude that the sputtered AIN films are feasible for the fabrication of uper UHF band SAW filters.