Memorial Lecture for Dr. H. Okino

2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2007-05-27 DOI:10.1109/ISAF.2007.4393222

T. Yamamoto

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Abstract

Dr. Okino's contributions for piezoelectric application field will be introduced. First of all, by using piezoresponse force microscopy (PFM) and contact-resonance piezoresponse microscopy (CR-PFM), domain structures and domain-related properties of typical piezoelectric single crystal, for example PbTiO₃, Pb(Mg_1/3Nb_2/3)O₃ -PbTiO₃ single crystals, were successfully observed. Four kinds of domain structures (180 c-c, 180 a-a, 90 a-a and 90 a-c domains) on grown surfaces of PbTiO₃ single crystals were imaged successfully using vertical and lateral piezoresponse force microscopy (PFM). Next, the domain-structure images of (001) plates of Pb(Mg_1/3Nb_2/3)O₃ -PbTiO₃ (PMN-PT) single crystals were successfully observed in a vacuum using a contact-resonance piezoresponse force microscopy. The domain structures of (001) plates of (l-x) Pb(Mg_1/3Nb_2/3)O_3-xPbTiO₃ (PMN-PT) single crystals were obtained at room temperature after 240 thermal treatment at various cooling rates. PMN -32 % PT and PMN- 34 %PT single crystals undergoes a relaxor-ferroelectric phase transition from Tetragonal phase to the Cubic phase.

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冲野博士纪念讲座

介绍了冲野博士在压电应用领域的贡献。首先，利用压电响应力显微镜(PFM)和接触共振压电响应显微镜(CR-PFM)，成功地观察了PbTiO3、Pb(Mg1/3Nb2/3)O3 -PbTiO3单晶等典型压电单晶的畴结构和畴相关性质。利用垂直和横向压电响应力显微镜(PFM)成功地对PbTiO3单晶生长表面的四种结构域(180 c-c、180 a-a、90 a-a和90 a-c)进行了成像。接下来，利用接触共振压响应力显微镜成功观察了Pb(Mg1/3Nb2/3)O3 -PbTiO3 (PMN-PT)单晶(001)片的畴结构图像。(001)板(l-x) Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT)单晶经不同冷却速率的240℃热处理后，在室温下获得了畴结构。PMN- 32% PT和PMN- 34% PT单晶经历了从四方相到立方相的弛豫-铁电相变。

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2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics

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