• 한국세라믹학회지
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• 제23권6호
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• pp.33-36
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• 1986

The $PbTiO_3$is well known materials having remarkable ferroelectric piezoelectric and pyro-electric properties. Thin films of the lead titanite has been successfully fabricated by Chemical Vapor Deposition on the borosilicate glass and titanium substrate. The $PbTiO_3$ thin film deposited on the borosilicate glass using the $PbCl_2$, $TiCl_4$ dry oxygen and wet oxygen at different temperatures (50$0^{\circ}C$-$700^{\circ}C$) grows along the (001) preferred orientation. On the other hand the $PbTiO_3$ thin film deposited on the titanium substrate using the PbO grows along the (101) preferred orientation. Growth orientation of deposited $PbTiO_3$ depends on the reaction species irrespective of substrate materials. Maximum dielectic constant and loss tangent of the $PbTiO_3$ thin film deposited on the titanium substrate are about 90 and 0.02 respectively, . Deposition rates of $PbTiO_3$ deposited on the borosilicate glass and titanium substrate are 10-15 ${\mu}{\textrm}{m}$/hr. Titanium dioxide interlayer formed be-tween $PbTiO_3$ film and titanium substrate material, It improved the adhesion of the film.

• 한국결정성장학회지
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• 제16권1호
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• pp.1-7
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• 2006

Some lead-based crystals show excellent ferroelectric, piezoelectric or scintillation properties and have attracted much attention in recent years. However, the erosion of the high temperature solution on platinum crucible and the evaporation of PbO component are the main problems often encountered during the crystal growth. In this paper, we reported recent progress on the Bridgman growth of lead-based functional crystals, such as novel relaxor ferroelectric crystals (PZNT and PMNT), scintillation crystals $(PbWO_4,\;PbF_2\;and\;PbClF)$ and piezoelectric crystals $(Pb_5Ge_3O_{11}\;and\;Pb_2KNb_5O_{15}),$ in Shanghai Institute of Ceramics, Chinese Academy of Sciences. The vertical Bridgman method has been modified to grow PZNT crystals from high temperature solution and as-grown crystals have been characterized. Large size lead-based scintillators, $PbWO_4\;and\;PbF_2$ crystals, have been mass-produced by the vertical Bridgman method in the multi-crucible fumace. These crystals have been supplied to CERN and other laboratories for high-energy physics experiments. The Bridgman growth of piezoelectric crystals $Pb_5Ge_3O_{11}\;and\;Pb_2KNb_5O_{15}$ are discussed also.

• 한국세라믹학회지
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• 제33권11호
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• pp.1260-1266
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• 1996

The effects of SiO2 MnO2 and sintering atmospheres (O2, N2) on the piezoelectric properties and densification behaviors of Pb0.98Cd0.02Zr0.36Ti0.39Ni0.083Nb0.167O3 were investigated. The addition of SiO2 to the system enhanced the rate of densification but supressed the rate of grain growth. On the other hand the addition of MnO2 to the system did not nearly affect the rate of densification but increased slightly the rate of grain growth The densification of Pb0.98Cd0.02Zr0.36Ti0.39Ni0.083Nb0.167O3 containing of SiO2 or MnO2 was promoted with increasing the partial pressure of O2. The relative dielectric constant ($\varepsilon$r) and piezoelectric constant (d33) of Pb0.98Cd0.02Zr0.36Ti0.39Ni0.083Nb0.167O3 containing of SiO2 or MnO2 sintered under O2 atmosphere were higher than under N2 atmosphere. Whereas the mechanical quality factor (Qm) of specimens sintered under O2 atmosphere were lower than under N2 atmosphere. Thus the sintering atmosphere of O2 and N2 in Pb0.98Cd0.02Zr0.36Ti0.39Ni0.083Nb0.167O3 containing of SiO2 or MnO2 acted as donor and acceptor respectively. As the amount of SiO2 increased the relative dielectric constant ($\varepsilon$r) and piezoelectric constant (d33) of Pb0.98Cd0.02Zr0.36Ti0.39Ni0.083Nb0.167O3 but the mechanical quality factor (Qm) did not nearly change, In the case of the addition of MnO2 to the system the relative dielectric constant ($\varepsilon$r) and piezoelectric constant (d33) of Pb0.98Cd0.02Zr0.36Ti0.39Ni0.083Nb0.167O3 sintered under O2 atmosphere decreased rapidly with increasing the amount of MnO2 but they were unchanged with increasing the amount of MnO2 under N2 sintering atmosphere. Therefore the differences of the relative dielect-ric constant ($\varepsilon$r) and piezoelectric constant (d33) due to sintering atmosphere were diminished as the amount of MnO2 increased.

• 대한화학회지
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• 제46권3호
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• pp.242-251
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• 2002

졸-겔 형판 합성법을 이용하여 페로브스카이트 구조를 갖는 나노튜브를 합성하고 그 특성을 조사하였다. PbTiO3(PT), PbZrO3(PZ)와 PbZrO3-PbTiO3(PZT)고용체 나노튜부는 반응물, Ti(OPri)4, Zr(OBu)3와 Pb(OAc)2-3H2O 들의 킬레이트 졸-겔 합성법에 의해서 합성하였다. 산화 알루미늄 형판은 200nm의 직경을 갖는 훠트만 아노디스크가 사용되었다. 6.0M-NaOH 용액에서 형판을 제거한 다음, 주사현미경 분석에 의해서 50m 길이와 200nm 외곽 직경의 생성물 나노튜브를 확인할 수 있었다. 투과현미경 분석과 전자회절 분석에 의하여 나노튜브가 다결정임을 확인하였다. DSC 분석에 의하여 PT 나노튜브의 상전이 온도는 특이하게도 234.4$^{\circ}C$ 임이 확인되었으며, 이때의 입자크기는 X-선 분석의 하나인 Scherrer 식에 의해서 15.4nm 임이 계산되었다.

• 박물관보존과학
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• 제24권
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• pp.99-116
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• 2020

본 연구에서는 동북아시아에서 고대에 제작되었던 납유리와 녹유의 납동위원소비와 화학조성의 분석자료를 기초하여 산지를 추정하고 그 특성을 고찰해 보고자 한다. 백제의 익산 왕궁리유적과 미륵사지에서 출토된 납유리와 녹유의 납동위원소비를 비교한 결과, 추정산지는 한국 남부 경기육괴 서부(zone4)로 같은 지역에서 납을 채취하여 제작한 것으로 보인다. 통일신라 사찰에서 출토된 녹유와전은 일부를 제외하고 대부분이 동북아시아에서 그 산지를 짐작하기 어려웠다. 7세기경 백제와 신라, 중국, 일본에서 출토된 납유리의 주성분은 PbO, SiO₂, Al₂O₃, CuO, Fe₂O₃이며, 비율은 PbO 70wt.%, SiO₂ 30wt.%으로 확인된다. 통일신라 사찰에서 출토된 녹유와전은 PbO 64~90wt.%로 납의 함유량이 높게 나타났다. 특히, 경주 사천왕사지 출토 <녹유능형전>은 주성분이 PbO, SiO₂, Al₂O₃, CuO이며 납유리와 조성성분이 유사하다. 일본의 『조불소장물장(造佛所作物帳, AD733년)』에 대한 유약 재현실험 결과, 중국과 일본 가마터 출토품의 PbO 값이 일정하게 확인되었다. 이는 당시 동북아시아에서 제작기술의 공유가 있었음을 시사해 준다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1999년도 추계학술발표강연 및 논문개요집
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• pp.34-34
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• 1999

• Composites Research
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• 제35권4호
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• pp.298-302
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• 2022

할라이드 페로브스카이트 물질은 우수한 광전특성으로 인해 차세대 디스플레이에 응용시킬 물질로서 주목받고 있다. 본 연구에서는 다공성 SiO₂ 나노입자의 기공 내부에서 제한시킨 결정 성장을 통하여 할라이드 페로브스카이트의 안정성 문제를 해결한, CsPbBr₃의 새로운 소결법을 제안한다. 최적의 소결 조건에서 소결된 CsPbBr₃-SiO₂ 나노입자는 515 nm의 발광 피크를 나타낸다. CsPbBr₃-SiO₂ 나노입자는 소결 과정 중 닫힌 기공에 말미암아 몇 종의 극성 용매 속에서도 안정적으로 발광 특성을 유지할 수 있었으며, 이는 디스플레이용 색변환 필름으로서의 응용 가능성을 보여준다.

• Bulletin of the Korean Chemical Society
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• 제21권8호
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• pp.801-804
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• 2000

A crossed beam scattering of a $Pb(ZrxTi1-x)O_3plume$ and an oxygen jetwas studied by using a time-of-flight quadrupole mass spectroscopy. Both simple collisions and reactive scatterings had significant effects on the transportand energetics of ions in the plume. Relative enrichment of metal and metal oxide ions was also changed with the oxygen pulse because of the differences in the mass and chemical properties of the ions. In particular, an anomalous increase ofPb+ ions was observed as the oxygen jet crossed the plume at high laserfluences, while the signal magnitudes of alI other ions were reduced. This originates from the fact that PbO+ ions dissociate easily to liberate Pb+ ions inthe plume since the bond energy of PbO+ is as low as 2.2 eV.

• 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.

• Transactions on Electrical and Electronic Materials
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• 제9권3호
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• pp.91-95
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• 2008

In this study, in order to develop the composition ceramics for low loss multilayer piezoelectric actuator application, $Pb(Zn_{1/2}W_{1/2})O_3-Pb(Mn_{1/3}Nb_{2/3})O_3-Pb(Zr,Ti)O_3$ (abbreviated as PZW-PMN-PZT)ceramics according to the amount of $MnO_2$ addition were fabricated using two-stage calcinations method. And also, their dielectric and piezoelectric properties were investigated. At the 0.2 wt% $MnO_2$ added PZW-PMN-PZT ceramics sintered at $930^{\circ}C$, density, electromechanical coupling factor $k_p$, dielectric constant ${\varepsilon}_r$, piezoelectric $d_{33}$ constant and mechanical quality factor $Q_m$ showed the optimum value of $7.84g/cm^3$, 0.543, 1,392, 318.7 pC/N, 1,536, respectively for low loss multilayer ceramics actuator application.