• Title/Summary/Keyword: Calcining condition

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Microwave Dielectric Properties of $Ba(Mg_{1/3}Ta_{2/3})O_3$[BMT] Ceramics with Ca1cining Condition (하소조건에 따른 $Ba(Mg_{1/3}Ta_{2/3})O_3$[BMT] 세라믹스의 마이크로파 유전특성)

  • Hwang, Tae-Kwang;Lim, Sung-Soo;Chung, Jang-Ho;Bae, Seon-Gi;Lee, Young-Hie
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.04b
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    • pp.84-87
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    • 2000
  • The microwave dielectric properties of complex perovskite-structured $Ba(Mg_{1/3}Ta_{2/3})O_3$ ceramics were investigated with calcining condition. The BMT ceramics were prepared by conventional mixed oxide method. Calcining conditions were $1200^{\circ}C$ for 10hr., $1300^{\circ}C$ for 2hr., and 5hr., respectively. And the specimens were sintered at $1650{\mu}m$. The structural and microwave properties of BMT ceramics were investigated by XRD, SEM and network analyzer. In the case of BMT ceramics calcined at $1300^{\circ}C$ for 5 hr., dielectric constant, quality factor and temperature coefficient of resonant frequency were 20.26, 31,144(at 1GHz), 6.11[ppm/$^{\circ}C$], respectively.

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Studies on Synthesis of X-type Zeolite from the Natural Mordenite (천연 Mordenite로부터 X-형 제올라이트 합성에 관한 연구)

  • 이미재;조재훈;허혜경;최병현
    • Journal of the Korean Ceramic Society
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    • v.31 no.12
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    • pp.1570-1576
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    • 1994
  • Effect of Na2O/SiO2 molar ratio, calcining temperature and addition of NaCl were investigated on the hydrothermal formation of X-type zeolite from the natural mordenite, which is a kind of rock deposited abundantly in kuryong po. Pulverized mordenite was first mixed with NaOH or NaOH-NaCl solution, and crystallized under hydrothermal condition at 90~10$0^{\circ}C$ for 10 hrs. Optimum condition for synthesis of the X-type zeolite were \circled1 the ratio Na2O/SiO2, NaCl/Al2O3 and H2O/Na2O:0.68, 11.4 and 40, respectively, \circled2 calcining temperature of starting materials: 90$0^{\circ}C$, \circled3 aging time: 48 hrs. and \circled4 crystallization temperature: 10$0^{\circ}C$. The yield of X-type zeolite under the optimum condition was about 55~60%, and the major crystallized X-type zeolite was faujasite phase. Zeolite of then type X was crystallized when NaCl was added to treating solution with in the limit 14.25 of NaCl/Al2O3 molar ratio. As the calcination temperature (from 50$0^{\circ}C$ to 95$0^{\circ}C$) of starting materials increases, yield of zeolite x increase.

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Studies on the Hexagonal Ferrite(IV) -The Formation Process of the Hexagonal Ferrites During Calcining the Mixture of $Ba(OH)_2$, $Zn(OH)_2$ and $6Fe(OH)_3$- (Hexagonal Ferrite에 관한 연구 (IV) -혼합수산화물로부터 각종 Hexagonal Ferrite 의 생성과정에 관한 연구-)

  • 김태옥
    • Journal of the Korean Ceramic Society
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    • v.17 no.3
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    • pp.121-128
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    • 1980
  • In order to obtain the fundamental data for the preparation of ferroxplana $Zn_2Y(Ba_2Zn_2Fe_{12}O_{22})$, which is useful for GHz-band communication, the optimum coprecipitation condition of $Zn(NO_3)_2-6FeCl_3$ in $NH_4OH$ solution and the formation process of the hexagonal ferrite were investigated. By the hot-petroleum-drying and calcining the coprecipitated hydroxide mixture $Zn(OH)_2 +Ba(OH)_2+ 6Fe(OH)_3$, the fine and uniform powder was obtained , whose phase composition and microstructure were studied by X.R.D. and electron microscope. In results, it was found that $Zn_2Y$, BaM and $Zn_2W$ were the representative phases in calcined specimens whose activation energies of crystal growth were about 3, 8, 2.5, $5.4{\times}10^4$ J/mole , respectively. The sintered specimens would be appreciated as useful magnetic cores for the high frequency communication.

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Effect of Preparation Conditions on Tc, Jc in the ($Bi_{1-x}Pb_{x}$)$_2$$Sr_2$$Ca_2$$Cu_{3.6}$$O_{y}$ Superconductors (($Bi_{1-x}Pb_{x}$)$_2$$Sr_2$$Ca_2$$Cu_{3.6}$$O_{y}$ 초전도체의 제작조건에 따른 Tc, Jc의 영향)

  • 황교영;조한대;이서웅;박용필;이준웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1990.10a
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    • pp.31-35
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    • 1990
  • In the ($Bi_{1-x}Pb_{x}$)$_2$$Sr_2$$Ca_2$$Cu_{3.6}$$O_{y}$ (x=0∼0.5) superconductors, DTA and XRD-pattern analyses were performed to obviousely define optimal calcining and sintering temperature. And, understanding behaviors of High-Tc phase with preparation condition of superconductors, that is, calcining and sintering temperature, sintering time, and variation of Pb contents, in order to make single phase of superconductor, microstructure and its composition were analyzed with SEM, XRD, and EDAX. continuously, the cause of phase transition was define with synthetically studying mutural relation between measured electrical resistivity and current density. Also, in order to design enhancement of critical current density, Jc required for realization, samples varied with pressing condition were made, and measured its, Jc.

Study on Pretreatment Methods for Calcium Extraction from Cuttle Bone (갑오징어갑으로부터 칼슘의 추출을 위한 전처리 방법의 검토)

  • CHO Moon-Lae;HEU Min-Soo;KIM Jin-Soo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.34 no.5
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    • pp.483-487
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    • 2001
  • As a part of basic investigation for utilizing of cuttle bone as a calcium source, we examined on the extraction methods (calcining at $800^{\circ}C$ for 2 hrs, autoclaving at $121^{\circ}C$ for 10 hrs and ultrasonic treatments at $60^{\circ}C$ for 10 hrs) as a pretreatment methods for preparation of calcium-based powder from cuttle bone, The color of calcined calcium-based powder from cuttle bone was white, while that treated by other methods was light yellow. The calcium content in calcined calcium-based powder was $70.5\%$, and revealed high about 2 times compared to those pretreated by other methods. And, calcium solubility in calcined calcium-based powder was improved 22 times compared to raw cuttle bone powder, Among calcining, autoclaving and ultrasonic treatments as a pretreaoent methods for preparation of calcium-based powder from cuttle bone, calcining treatment was superior to other methods on the aspect of color, calcium solubility and purity of calcium-based powder, Judging from X-ray diffraction pattern of calcined calcium-based powder, most of calcium was present as a form of calcium oxide, But, pH of calcined calcium-based powder revealed strong alkali of pH 12.9. This pH value might invoke health risk in using food resource. Therefore, for utilization effectively calcined calcium-based powder from cuttle bone, it requires a suitable treatment such as adjustment of pH to neutral condition.

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$SnO_2$ Dispersion of Sintered Body in $In_2O_3-SnO_2$ Binary System ($In_2O_3-SnO_2$ 이성분계 소결특성에 있어서 $SnO_2$ 분산성)

  • Chun, Tae-Jin;Park, Wan-Soo;Cho, Muyung-Jin;Kim, Jong-Su;Kim, Young-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.11a
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    • pp.198-198
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    • 2006
  • Tin doped $In_2O_3$ sputtering target is widely used to produce a various kinds of flat panel display because of high transmittance in visible region and high electrical conductivity. In2O3 and SnO2 powders were prepared by a homogeneous precipitation method using metal source, respectively, the calcining and sintering behavior of the indium-tin oxide(In2O3-SnO2) composite powders were studied. The tin oxide(SnO2) dispersion condition in ITO sputtering target was improved by increasing calcining temperature. And the tin oxide dispersion was also improved by reducing the tin oxide contents in the ITO target from 30 to 5wt%. SnO2 dispersion and densification of ITO target is very difficult to control due to sublimation of SnO2 at over 1150C.

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Optimization red emission of SrMoO4: Eu3+ via hydro-thermal co-precipitation synthesis using orthogonal experiment

  • Tan, Yongjun;Luo, Xuedan;Mao, Mingfu;Shu, Dehua;Shan, Wenfei;Li, Guizhi;Guo, Dongcai
    • Current Applied Physics
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    • v.18 no.11
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    • pp.1403-1409
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    • 2018
  • In the present study, the $SrMoO_4:Eu^{3+}$ phosphors has been synthesized through hydro-thermal co-precipitation method, and single factor and orthogonal experiment method was adopted to find optimal synthesis condition. It is interesting to note that hydro-thermal temperature is a prominent effect on the luminescent intensity of $SrMoO_4:Eu^{3+}$ red phosphor, followed by co-precipitation temperature, calcining time, and the doping amount of $Eu^{3+}$. The optimal synthesis conditions were obtained: hydro-thermal temperature is $145^{\circ}C$, co-precipitation temperature is $35^{\circ}C$, the calcining time is 2.5 h, and the doping amount of activator $Eu^{3+}$ is 25%. Subsequently, the crystalline particle size, phase composition and morphology of the synthesized phosphors were evaluated by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The results show that these phosphors possess a scheelite-type tetragonal structure, and the particle size is about $0.2{\mu}m$. Spectroscopic investigations of the synthesized phosphors are carried out with the help of photo-luminescence excitation and emission analysis. The studies reveal that $SrMoO_4:Eu^{3+}$ phosphor efficiently convert radiation of 394 nm-592 and 616 nm for red light, and the luminescence intensity of $SrMoO_4:Eu^{3+}$ phosphors is improved. $SrMoO_4:Eu^{3+}$ phosphors may be a potential application for enhancing the efficiency of white LEDs.

Studies on Hexagonal Ferrite (III) Coprecipitation-Method Preparation of Ferroxplana ZnY $(Ba_2Zn_2Fe_{12}O_{22})$ and Its magnetic Properties (Hexagonal Ferrite에 관한 연구 (III) 공침법에 의한 Ferroxplana ZnY $(Ba_2Zn_2Fe_{12}O_{22})$의 합성과 그 자성)

  • 김태옥;신학기
    • Journal of the Korean Ceramic Society
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    • v.16 no.2
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    • pp.89-98
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    • 1979
  • In order to prepare ferroxplana ZnY $(Ba_2Zn_2Fe_{12}O_{22})$, which would be useful for GHz-band communication, the optimum coprecipitation condition of 1 $BaCl_{2-1} Zn(NO_3)_2-6FeCl_3$ in $NaOH-Na_2CO_3$ solution was investigated by use of a new apparatus invented in our laboratory. By freeze-drying and calcining the coprecitated hydroxide-carbonate, the very reactive powder was obtained, from which the synthesis process of ZnY and the other related crystals were investigated by means of X-ray diffraction. In results, it was found that the reactive powder containing ZnY as the major component can be prepared by this method, which may be used in manufacturing the various magnetic cores for the microwave communication.

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Studies on Utilizations of Serpentine [I] Chemical Studies on the Fertilizer of Ignited Serpentine (蛇紋石의 利用에 關한 硏究 [I] 蛇紋石의 化學的 方法에 依한 肥效檢討)

  • Ham, Yong-Mook;Chun, Hai-Soo;Kim, Yong-Bai
    • Journal of the Korean Chemical Society
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    • v.8 no.1
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    • pp.5-8
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    • 1964
  • In order to investigate the availability of serpentines occurring in Korea as fertilizer, the dissolving rates of Magnesia and Silicate contents in 0.5N HCl solution after heat treatment of the serpentines, have been studied. It was found that calcination of the serpentines at $700^{\circC$ for 30 min. was the best condition for utilization of serpentines as fertilizer. The weight decrease on calcining has also been discussed from the chemical point of view.

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The Effect of Calcination Temperature on Physical Properties of $Ba[Mg_{1/3}(Nb_{0.2}Ta_{0.8})_{2/3}]O_3$ Ceramics (하소온도가 $Ba[Mg_{1/3}(Nb_{0.2}Ta_{0.8})_{2/3}]O_3$ 세라믹스의 물리적 특성에 미치는 영향)

  • 김재윤;김부근;김강언;정수태;조상희
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.252-255
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    • 1999
  • The effect of calcination temperature(1st and 2nd calcining at 110$0^{\circ}C$ , 120$0^{\circ}C$ and 130$0^{\circ}C$ respectively) on physical properties of BMNT Ceramics ware investigated. The optimum 1st and 2nd calcination temperature were 120$0^{\circ}C$ , and sintering temperature was 155$0^{\circ}C$. In this condition, the sintering density was 7.53 [g/㎤] and the dielectric constant, Q.f$_{0}$ and $\tau$$_{r}$ were 26, 80, 300[GHz] and +1.5[ppm/$^{\circ}C$] respectively in the microwave range.e.e.

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