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Preparation and Characterization of $(Ba_{0.5}La_{0.5}) (Mg_0.5}Mo_{0.5})O_3$ ($(Ba_{0.5}La_{0.5}) (Mg_0.5}Mo_{0.5})O_3$의 합성 및 특성연구)

  • 최진호
    • Journal of the Korean Ceramic Society
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    • v.22 no.3
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    • pp.25-28
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    • 1985

  • The new compound $(Ba_{0.5}La_{0.5}) (Mg_0.5}Mo_{0.5})O_3$ is synthesized under the $H_2$-atmosphere and reveals to have a cation ordering between Mg and Mo in cubic lattic of ordered perovskite (a0=8.009(2)$\AA$) and obeys Curie-Weiss law below the room temperature with the effective magnetic moment of 1.60(5) Bohr Magneton.

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Evaluation of Microwave Dielectric Properties in $(Pb_{0.5}Ca_{0.5})(Fe_{0.5}Ta_{0.5})O_3$ Ceramics by the Dielectric Mixing Rule (유전체 혼합 법칙을 이용한 $(Pb_{0.5}Ca_{0.5})(Fe_{0.5}Ta_{0.5})O_3$세라믹스의 마이크로파 유전특성 평가)

  • 박흥수;윤기현;김응수
    • Journal of the Korean Ceramic Society
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    • v.37 no.3
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    • pp.240-246
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    • 2000

  • The microwave dielectric properties of the complex perovskite (Pb0.5Ca0.5)(Fe0.5Ta0.5)O3 ceramics were investigated with the porosity and the dielectric mixing rule. Assuming that the specimens were mixtures of real dielectrics and pores, with 3-0 connectivity, the ionic polarizabilities modified by Maxwell's equation were more close to the theoretical values rather than those modified by Wiener's equation in porous specimens. The theoretical dielectirc loss were obtained with the infrared reflectivity spectra from 50 to 4000cm-1, which were calculated by Kramers-Kronig analysis and classical osciallator model. The relative tendency of dielectric loss calculated from the theoretical value and Maxwell's equation in the specimens with different porosities was in good agreement with the one by the post resonant method.

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Growth and Thermodynamic Function Properties of Undoped and Co-doped $Zn_{0.5}Mg_{0.5}Te$ Single Crystals ($Zn_{0.5}Mg_{0.5}Te$ 및 $Zn_{0.5}Mg_{0.5}Te:Co$ 단결정 성장과 열역학 함수 추정)

  • 김용근
    • Journal of the Korean Vacuum Society
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    • v.3 no.2
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    • pp.198-202
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    • 1994

  • Zn0.5Mg0.5Te 및 Zn0.5Mg0.5Te:Co 단결정을 온도진동법을 응용한 화학수송법으로 성장시켰고, 광 학적 energy gap의 온도의존성은 Varshni의형식에 잘 적용되었다. 광학적 energy gap의 온도의존성으 로부터 열역학 기본함수인 entropy, enthalpy, heat capacity를 구했다.

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Cathodic Polarization of $La_{0.5}Sr_{0.5}MnO_{3-\delta}$ on $Ce_{0.8}Gd_{0.2}O_{1.9}$ Electrolyte ($Ce_{0.8}Gd_{0.2}O_{1.9}$ 전해질에서 $La_{0.5}Sr_{0.5}MnO_{3-\delta}$ 양극의 과전압특성)

  • 윤희성;노의범;김병호
    • Journal of the Korean Ceramic Society
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    • v.35 no.9
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    • pp.981-987
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    • 1998

  • $La_{0.5}Sr_{0.5}MnO_{3-\delta}$ as air electrode for soild oxide fuel cell was synthesized by a citrate process and its cathodic polarization was determinated by the current interruption method on the Gd-doped ceria as electrolyte. The addition of citric acid increased the exothermic heat for the formation of $La_{0.5}Sr_{0.5}MnO_{3-\delta}$ perovskite oxide. The degree of the initial particle agglomeration was affected by the exothermic heat. Also the increase of cal-cination temperature enlarged the particle size and the higher sintering temperature accelerated the den-sification of $La_{0.5}Sr_{0.5}MnO_{3-\delta}$ layer after its being painted on $Ce_{0.8}Gd_{0.2}O_{1.9}$ electrolyte. In this study $La_{0.5}Sr_{0.5}MnO_{3-\delta}$ synthesized by citrate process of which the molar ratio of citric acid to metal nitrate was 2 calcined at $650^{\circ}C$ for 2hr and sintered at 1100 at $1200^{\circ}C$ for 4 hrs after slurry coating on Ce0.8Gd0.2O1.9 electrlyte showed the lowest cathodic polarization.

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Investigation on the Structural, Electrical and Magnetic Properties of Layered Perovskite Manganite La0.5Sr1.5Mn0.5Cr0.5-xFexO4 (x=0.15, 0.3) System (층상 페로브스카이트 구조인 La0.5Sr1.5Mn0.5Cr0.5-xFexO4 (x=0.15, 0.3) 망가나이트의 구조적, 전기적, 자기적 특성의 연구)

  • Singh, Devinder
    • Journal of the Korean Chemical Society
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    • v.55 no.4
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    • pp.697-702
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    • 2011

  • The new layered perovskite manganites $La_{0.5}Sr_{1.5}Mn_{0.5}Cr_{0.5-x}Fe_xO_4$ (x=0.15, 0.3) have been prepared by standard ceramic method. The powder X-ray diffraction studies show that the phases crystallize with tetragonal unit cell in the space group I4/mmm. The electrical transport properties suggest that the phases show insulating behaviour and the electrical conduction in the phases occurs by a 3D variable range hopping mechanism. The magnetic properties suggest that both the phases are antiferromagnetic.

  • https://doi.org/10.5012/jkcs.2011.55.4.697 인용 PDF KSCI KPUBS HTML

Preparation of Textured Bi0.5(Na,K)0.5TiO3-BiFeO3 Solid Solutions by Reactive-Templated Grain Growth Process

  • Kato, Kyoko;Kimura, Toshio
    • Journal of the Korean Ceramic Society
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    • v.43 no.11 s.294
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    • pp.693-699
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    • 2006

  • Textured $Bi_{0.5}(Na,K)_{0.5}TiO_3-BiFeO_3$ ceramics were prepared by the reactive-templated grain growth process, using platelike $Bi_4Ti_3O_{12}$ particles. The effects of chemical composition in $Bi_{0.5}(Na,K)_{0.5}TiO_3$ on texture development and densification were examined. Textured ceramics were obtained by using $Bi_{0.5}K_{0.5}TiO_3$ as an end member of the solid solution but densification was limited. Dense ceramics were obtained by using $Bi_{0.5}Na_{0.5}TiO_3$ but texture did not develop. Dense, textured ceramics were obtained by using $Bi_{0.5}(Na_{0.5}K_{0.5})_{0.5}TiO_3$.

  • https://doi.org/10.4191/KCERS.2006.43.11.693 인용 PDF KSCI

Segregation and Order on $Pt_{0.5} Ni_{0.5}${110} Surface ($Pt_{0.5} Ni_{0.5}${110} 표면의 편석과 질서)

  • 서지근;강석태;한원근
    • Journal of the Korean Vacuum Society
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    • v.4 no.1
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    • pp.6-11
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    • 1995

  • Pt0.5 Ni0.5{110}표면에서의 편석 역전과 조성상 질서를 표면 효과를 고려한 간단한 Ising 모형을 이용하여 연구하였다. 합금 표면의 성질을 질서 상태의 해석적 계산으로 정성적으로 이해하였으며, 몬테 카를로 시뮬레이션으로 실험 결과들과 정량적으로 비교하였다. 본 연구 결과의 일부실험에 의해 검증되기를 기다린다.

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