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Dielectric and Conduction Behaviors of Lithium Germanium Silicate Glasses
S. M. Lee,Y. H. Kim,C. H. Song,윤수종,김혜성,양용석,임영훈 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.31
The dielectric response and the ionic conductivity in Li_2Ge_xSi_(2−x)O_5 (LGSO; x = 0, 0.5, 1, 1.5, and 2) glasses have been investigated in the frequency range from 100 Hz to 15 MHz and in the temperature range from room temperature to the glass transition temperature T_g. The values of the dielectric constant and the dc conductivity are very high for LSGO systems. The frequencydependent electrical data have been discussed in the framework of the complex impedance and the power law conductivity. The electrical conductivity is weakly composition dependent, and it follows the Arrhenius relation in the experimental temperature range. The activation energies of the dc and the ac conductivities obtained by using a power law analysis show that the LGSO glasses satisfy the Barton, Nakajima, and Namikawa (BNN) relation. The temperature-dependent interaction of conducting ions is discussed.
Mg-Ca 합금의 전기화학적 특성에 미치는 Ca 첨가량 및 열처리의 영향
이상희 ( S. H. Lee ),정동석 ( Dong Seok Chung ),박병옥 ( B. O. Park ),김용길 ( Y. G. Kim ),정하국 ( Ha Guk Jeong ),김혜성 ( Hye Sung Kim ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.3
N/A In this study, the influence of heat treatment and Ca contents on the electrochemical behavior was investigated. Mg-Ca alloys, i.e., Mg-0.22wt%Ca, Mg-0.56wt%Ca, Mg-1.31wt%Ca are prepared by ingot metallurgy. As-cast Mg-Ca alloys exhibited better electrochemical properties than pure Mg. Especially, Mg-0.22wt%Ca alloy improves its anode efficiency up to 62% and lowers the OCP up to -1.72VSCE. Microstructure and XRD patterns of Mg-Ca alloys show that additive Ca element is mainly solid-solutioned. While, the others show the microstructure and XRD pattern with large Mg₂Ca at grain boundary. To assess the effect of heat treatment on the as-cast Mg-alloy, the specimens were heat treated at 200℃ for 2 hours under CO2 gas atmosphere. Although corrosion properties of Mg-Ca alloys are somewhat deteriorated by heat treatment at 200℃ Mg-0.22wt%Ca alloy with uniformly distributed nano-sized Mg,Ca phase in a-Mg matrix show still better corrosion properties than pure Mg specimen.