• 제목/요약/키워드: Pb Substitution

검색결과 112건 처리시간 0.033초

$Pd_{(1-x)}$$Cd_x$[(Mn, Sb), Zr, $Ti]O_3$ 세라믹스의 소결 거동 및 압전 특성에 대한 연구 (The Study of Sintering Behavior and Piezoelectric Properties in $Pd_{(1-x)}$$Cd_x$[(Mn, Sb), Zr, $Ti]O_3$ Ceramics)

  • 나은상;최성철
    • 한국세라믹학회지
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    • 제37권4호
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    • pp.395-401
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    • 2000
  • In this study, we chose the basic composition which indicated the best electrical properties by change of x content(0, 0.05, 0.1, 0.15, 0.2, 0.25 mol respectively) in xPb(Mn1/3Sb2/3)O3-(1-x)Pb(Zr0.52Ti0.48)O3 ceramics. And we substituted Cd2+ for Pb2+ site, then observed the sintering behavior, microstructure and electrical propertties according to the various sintering temperature. The basic composition was the 0.05PMS-0.95PZt, and it showed single perovskite phase and excellent properties. In case of Cd2+ substitution, we were able to sinter at 90$0^{\circ}C$ which was lower than conventional sintering temperature(1200~130$0^{\circ}C$). Especially, when the 2mol% substituted PMS-PZT specimens were sintered at 90$0^{\circ}C$ for 2h, we obtained the p=7.6g/㎤, kp=56%, Qm=520 and made sure of a position of Cd2+ substitution by observing lattice parameter, phase transition temperature. From this results, we could infer that because Cd2+ substituted fro A-site, low temperature sintering of Cd2+ substituted PMS-PZT without any loss of electrical properties shows its applicability for the piezoelectric ceramic transformer.

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Sr이 치환된 PMN-PT-PZ 계 세라믹스를 이용한 압전 발음체에 관한 연구 (A Study on the Piezoelectric Sounder Using the PMN-PT-PZ with Sr Sustitutions)

  • 유학수;백동수;강진규;박창엽
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1991년도 추계학술대회 논문집 학회본부
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    • pp.293-295
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    • 1991
  • In this study, we investigated the possibilty that $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3-PbZrO_3$ ceramics with strontium substitutions could be used for piezoelectric sounders. Piezoelectric buzzer is one of them. By partially substituting Sr for Ph, dielectric constants had values greater than 2000, the value proper piezoelectric buzzer, piezoelectric constant($d_{31}$) had a maximum value, 298 $[10^{-12}C/N]$, at the Sr 5 mol % substitution. Sound level of piezoelectric buzzer had the highest value of 91 dB at the Sr 5 mol % substitution.

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동축형 공진기용 $(PbCa)ZrO_3$ 분말의 합성 (Preparation of Fine-particle $(PbCa)ZrO_3$ for Resonator)

  • 이병하;이경희;윤성화
    • 한국세라믹학회지
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    • 제30권8호
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    • pp.635-642
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    • 1993
  • To obtain a higher dielectric constant material, we investigated Ca substitution for Pb in PbZrO3. In this study, the four mixtures of (Pb0.68Ca0.32)ZrO3, (Pb0.65Ca0.37)ZrO3, (Pb0.63Ca0.37)ZrO3, and (Pb0.60Ca0.40)ZrO3 were prepared by coprecipitation reaction of Pb(NO3)2, ZrOCl2, and CaCl2 with (NH4)2CO3 and NH4OH in aqueous solution. The (Pb1-xCax)ZrO3 with different x mole fractions (x=0.35, 0.37) showed not only high dielectric constant, but also high Q values and low temperature coefficient of the capacitance.

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Modified Oxalate Process에 의한 (Ba,Pb)$TiO_3$ 분말합성 및 특성에 관한 연구 (A Study on the Synthesis and Properties of (Ba,Pb)$TiO_3$Powder by Modified Oxalate Process)

  • 최병현;이미재;박선미
    • 한국세라믹학회지
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    • 제33권7호
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    • pp.743-754
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    • 1996
  • In this study (Ba1-xPbx)TiO3 was synthesized by modified oxalate process in order to prevent vaporization of PbO through low temperature synthesis climinate Cl ion reproducibly substitute Pb for by and uniformly distribute ion (Ba1-xPbx)TiO3 was synthesized by coprecipitation of lead acetate barium acetate and ammonium titanyl oxalate have been used as starting materials. The substitution of Pb for Ba was reproducibly possible synthetic temperature of perovskite structure becomes lowed as the Pb concentration increases and fine partic-les (specific surface are :7.2 cm2/g) were obtained, BaTiO3 powders calcined at 90$0^{\circ}C$ for 3 hours were cubic from in XRD analysis and as Pb content was increases evident split of tetragonal peaks could be observed The optimum conditions to synthesize (Ba,Pb)TiO3 powder are the followings ; synthesis temperature (5$^{\circ}C$)

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적층 압전 변압기용 변성 $PbTiO_3$ 세라믹스의 압전 및 유전 특성 (Piezoelectric and dielectric Properties for Multilayer Piezoelectric Transformer Of Modified $PbTiO_3$ system ceramics)

  • 유경진;류주현;정영호
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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    • pp.344-345
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    • 2006
  • In this study, in order to develop low temperature sintering piezoelectric transformer, $(Pb_{0.99-x}Ca_xSr_{0.01})Ti_{0.96}(Mn_{1/3}Sb_{2/3})_{0.04}O_3$ ceramic systems were fabricated using $Na_2CO_3-Li_2CO_3$ as sintering aids and investigated with the amount of Ca substitution. The piezoelectric transformer requires high electromechanical coupling factor $k_t$ and high mechanical quality factor $Q_{mt}$ for generating high output power At the ($PbCaSr)Ti(MnSb)O_3$ ceramics with 24mol% Ca substitution sintered at $900^{\circ}C$, electromechanical coupling factor $k_t$ and mechanical quality factor $Q_{mt}$ showed the optimal values of 0.504 and 1655 respectively, for thickness vibration mode multilayer piezoelectric transformer application.

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Morphotropic Phase Boundary 영역의 Pb(Zr, Ti)O3-Pb(Co, Nb)O3계 고용체의 격자변형에 따른 강유전 특성 변화 (Variations of Ferroelectric Properties by Unit Cell Distortion of Pb(Zr, Ti)O3-Pb(Co, Nb)O3 Solid Solution in Morphotropic Phase Boundary)

  • 이전국;정형진
    • 한국세라믹학회지
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    • 제25권6호
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    • pp.694-698
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    • 1988
  • Pb(Zr, Ti)O3-Pb(Co, Nb)O3 systems were investigated by x-ray diffraction method. System contains rhombohedral, tetragonal, and pseudocubic structures at room temperature. Crystal symmetry was changed from 4-fold symmetry to 3-fold symmetry by substituting Pb(Co1/3, Nb2/3)O3 ; PCN, to Pb(Zr0.52, Ti0.48)O3 ; PZT. As the substituted PCN concentration was increased, an increase in a-axis direction and a decrease in c-axis in the perovskite structure were occurred simultaneously, so that the crystal symmetry was changed into such way. In the higher sinteringtemperatures, the unit cell distortions occurred rather in the lower substitution range of PCN. The ferroelectric properties were maximized at the region that tetragonal and rhombohedral or pseudocubic structures were coexist.

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La 변성 $Pb(Sc_{1/2}Nb_{1/2})O_3-PbTiO_3$계 요업체의 전계유기변위와 분극특성 (Field-Induced Strains and Polarization Switching Mechanisms in La-Modified $Pb(Sc_{1/2}Nb_{1/2})O_3-PbTiO_3$ Ceramics)

  • 장명철
    • 한국세라믹학회지
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    • 제37권1호
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    • pp.63-69
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    • 2000
  • Electrically-induced strain(S) and polarization(P) for Pb(Sc1/2Nb1/2)O3-PbTiO3(1-x)PSN-xPT) crystalline solutions were studied. From the compositional dependence of S and P we could observe two maximum values at x=0.10 and x=0.425. It is considered that PSNT10(x=0.10) composition is the structural phase boundary to indicate the variable order-disorder[VOD] region. PSNT(x=0.425) composition is the morphotropic phase boundary[MPB] to indicate the rhombohedral to tetragonal phase transition. Higher S (0.437%) and P (0.3974$\mu$C/$\textrm{cm}^2$) values were attained by the La substitution (5 wt%) at Pb site in the MPB composition of 57.5PSN-42.5PT.

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