Ferroelectricity of the 1.7 nm-high and 38 nm-wide self-assembled PbTiO3 island
Ferroelectricity of the 1.7 nm-high and 38 nm-wide self-assembled PbTiO3 island
复制标题
DOI：
10.1016/s0955-2219(03)00457-6
复制
发表时间：
2004-01-01
影响因子：
5.7
通讯作者：
Niu, H
中科院分区：
文献类型：
--
作者：
Fujisawa, H;Okaniwa, M;Niu, H
用掠入射X射线衍射（GIXD）方法研究了金属有机化学气相沉积（MOCVD）法在390 ℃和560 ℃下生长的纳米PbTiO_3岛的晶体和铁电性能。和压电响应扫描力显微镜（PFM）。通过将生长温度从560 ℃降低到390 ℃，PbTiO 3岛的平均高度从19 nm降低到3.6 nm，而平均宽度从49 nm略微降低到41 nm。GIXD测量显示，纳米级的PbTiO 3岛与纯钙钛矿相成功地生长在390和，560 degreesC。在390 ℃和560 ℃下生长的PbTiO 3岛的择优取向分别为（001）和（111）。使用PFM，压电滞后回线与极化反转，得到在每个单独的岛。这是纳米岛中存在铁电性的证据。表现出铁电性的最小岛为1.7 nm高和38 nm宽。(C)2003爱思唯尔有限公司。保留所有权利。
Crystalline and ferroelectric properties of nanosized PbTiO3 islands grown at 390 and 560 degreesC-by metalorganic chemical vapor deposition (MOCVD) were investigated by the grazing incidence X-ray diffraction (GIXD) method.-and piezoresponse scanning force microscopy (PFM). By reducing the growth temperature from 560 to 390 degreesC, average height of PbTiO3 islands decreased from 19 to 3.6nm while the average width slightly decreased from 49 to 41nm. GIXD measurements revealed that nanosized PbTiO3 islands with the pure perovskite phase were successfully grown at 390 and, 560 degreesC. Preferential orientations of PbTiO3 islands grown at 390 and 560 degreesC were (001) and (111), respectively. Using PFM, piezoelectric hysteresis loops with polarization reversal were obtained at each individual island. This is evidence for the presence of ferroelectricity in nanosized islands. The minimum island exhibiting ferroelectricity was 1.7 nm high and 38 nm wide. (C) 2003 Elsevier Ltd. All rights reserved.