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B-Site Disordered New Lead-Free Relaxor Ferroelectric Gd(Ni0:5Ti0:5)O3 System
박성균,장민수,김동진,정일경,박철홍,S. S. Park,배종성,J. P. Kim,K. S. Hong,E. D. Jeong,Y. S. Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Gd(Ni0:5Ti0:5)O3 solid solutions were synthesized and their structural and physical properties characterized. The X-ray diraction showed that the average structure of the system at room temperature was orthorhombic (Pbnm). The temperature-dependent AC-dielectric constant showed an anomaly (hump) around 500 { 600 K, depending on the frequency. The D-E hysteresis loops were also measured at room temperature and exhibited ferroelectric characteristics. The relaxor ferroelectric behavior of this lead-free centrosymmetric system might be related to the B-site local disorder in the system.
편리한 입력방식의 단조공정해석을 위한 CAMPform3D의 전처리기 개발
이승표,이강수,박성균,이상헌 한밭대학교 생산융합기술연구소 2004 생산기반기술연구소 논문집 Vol.4 No.1
CAMPform3D is a Finite Element Method (FEM) based process simulation system designed to analyze three dimensional (3D) flow of various metal forming processes. It enables designers to analyze metal forming processes on the computer rather than the shop floor using trial and error and provides vital information about material and thermal flow during the forming process to facilitate the design of products. CAMform3D can be used by companies, research institutes and industrial applications to analyze forging, extrusion, drawing, heading, upsetting and many other metal forming processes. Also, process simulation using CAMPform3D can be instrumental in cost, quality and delivery improvements at leading companies. Today's competitive pressures required companies to take advantage of every tool for rapid manufacturing of well-designed product. So, the preprocessor of simulation program must be easy to use to speed-up design. In this paper, we introduce new version of CAMPform3D (ver 1.0) and show how easy to use it. And, CAMPform3D will prove itself to be easy and extremely effective.