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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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초록· 키워드
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A homogeneous KNbO3 (KN) phase was formed by sintering at 1,040oC for 1 hour, without formation of the K2O-deficient secondary phase even though suffering the minor loss of K2O. KN liquid phase was formed during sintering and abnormal grain growth occurred in this specimen. The detailed microstructural observations on KN during sintering were carried out using high resolution transmission electron microscopy. The ledged structures were found at the KN grain boundary and the abnormal grain growth was performed by the lateral migration of these ledges in the presence of the liquid phase. The liquid pockets were found in the KN grains. They have various external shapes mainly due to the kinetic factors. They have atomically flat interfaces with some ledges with one atomic height. The slight deficient K2O by evaporation might somewhat reduce the melting point of KN from the reported at 1,058oC. The liquid pockets play an important role in supplying the liquid phase during the abnormal grain growth in the sintering process of KN ceramics.
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참고문헌 (15)
참고문헌 신청
Aaronson H I / 1978 / Precipitation Processes in Solids / AIME : 31 ~ 86
Birol H / 2005 / Preparation and characterization of KNbO3 ceramics / J. Am. Ceram. Soc 88 : 1754 ~ 1759
Guo Y / 2004 / Dielectric and piezoelectric properties of lead-free (Na0.5K0.5)NbO3-SrTiO3 ceramics / Solid State Commun 129 : 279 ~ 284
Hajime N / 2007 / Fabrication and electrical properties of potassium niobate ferroelectric ceramics / Jpn. J. Appl. Phys 46 : 7084 ~ 7088
Irle E. / 1991 / The phase diagrams of Na2O and K2O with Nb2O5 and the ternary system niobium Nb2O5-Na2O-Yb2O3 / Thermochim. Acta 179 : 157 ~ 169
Birol H / 2005 / Preparation and characterization of KNbO3 ceramics / J. Am. Ceram. Soc 88 : 1754 ~ 1759
Guo Y / 2004 / Dielectric and piezoelectric properties of lead-free (Na0.5K0.5)NbO3-SrTiO3 ceramics / Solid State Commun 129 : 279 ~ 284
Hajime N / 2007 / Fabrication and electrical properties of potassium niobate ferroelectric ceramics / Jpn. J. Appl. Phys 46 : 7084 ~ 7088
Irle E. / 1991 / The phase diagrams of Na2O and K2O with Nb2O5 and the ternary system niobium Nb2O5-Na2O-Yb2O3 / Thermochim. Acta 179 : 157 ~ 169
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