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김성대,전기범,배세환,진병문,Kim, S.D.,Jeon, K.B.,Bae, S.H.,Jin, B.M. 한국결정성장학회 2008 韓國結晶成長學會誌 Vol.18 No.3
PZ와 PT를 각각 3층씩 그 순서를 달리하고 열처리 과정을 달리하여 4가지 시료를 만들었다. PZ와 PT를 독립적으로 열처리 한 시료들에서는 PZ와 PT가 독립적으로 존재하는 경향이 강한 반면 PZ와 PT를 동시에 열처리 한 시료들은 PZT 복합상이 존재하는 확률이 더 높아졌다. 후자의 경우 PT를 먼저 증착한 쪽이 더 안정적인 PZT 상을 만든다는 결론을 지을 수 있었다. Four different thin films were made by depositing PZ and PT in different stacking sequences. PZ and PT phases are preferably co-existed in sample A and C that are annealing after each coatings. The sample B and D, on the other hands, have tendency toward the PZT phase after co-firing the sample. The sample B that started from PT stacking first was more stable PZT phase than that of PZ first sample D.
K₃Li₂Nb_5O_15 단결정의 성장과 특성에 관한 연구
진병문,노지현,김태훈,김정남,김진수 동의대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.10 No.1
The potassium lithium niobate (K₃Li₂Nb_5O_15) single crystals were growing in K_χLi_(1-χ)NbO₃(x=0.4∼0.6) chemical formular by the Czochralski method. Crystal growth is studied in two orientations with growth along a-axis and c-axis. We have subjected this crystal to x-ray diffraction studies and found that they are single-crystalline and belong to tetragonal system with the lattice parameters a=b=12.577Å and c=3.997Å. The temperature dependence of dielectric constant was measured in the region of the phase transition. Curie temperature and diffuseness of phase transition are influenced by composition concentration. The composition and cation distribution of ferroelectric TB-type niobate crystals has a strong influence on the ferroelectric properties. Growth condition, optical transmittance, etching pattern and dielectric properties are presented and discussed.