Ferroelectric Polarization Induced Oriented Attachment Growth of PbTiO3 Films and Grain Size Control

doi:10.11901/1005.3093.2020.150

Chinese Journal of Materials Research

2020, Vol. 34

Issue (9): 650-658 DOI: 10.11901/1005.3093.2020.150

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Ferroelectric Polarization Induced Oriented Attachment Growth of PbTiO₃ Films and Grain Size Control

WU Mengjiao¹, REN Zhaohui¹(

), TIAN He², HAN Gaorong¹

1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
2. Center of Electron Microscope, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Cite this article:

WU Mengjiao, REN Zhaohui, TIAN He, HAN Gaorong. Ferroelectric Polarization Induced Oriented Attachment Growth of PbTiO₃ Films and Grain Size Control. Chinese Journal of Materials Research, 2020, 34(9): 650-658.

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Abstract

PbTiO₃ (PTO) ferroelectric thin films were synthesized by a sol-gel process, where different concentration (0.2%, 0.5%, 0.8%, mole ratio) of PbTiO₃ nanoplates with large spontaneous polarity were introduced to the sol system to manipulate the growth and microstructures of PbTiO₃ films. The products were then characterized by means of X-ray diffractometer(XRD), scanning electron microscope (SEM), transmission electron microscope (TEM). The effect of PTO nanoplates on the growth mechanism of PTO films was investigated by in-situ XRD. It was found that nanoplates dramatically affected the growth process and crystallographic orientation of PbTiO₃ films, giving rise to a preferred orientation of (100) in PbTiO₃ films. In addition, an effective control of grain size of PbTiO₃ films ranging from 100 nm to 2 μm has been realized by altering the concentration of nanoplates. According to results of SEM, TEM and in-situ XRD analysis, the grains in solid-state films exhibited the growth characteristics of orientation related gathering of gains, similar to that in liquid phase. This growth behavior can be attributed to the strong electrostatic force originated from polar surfaces of nanoplates, which induced the adsorption and oriented alignment of small grains, accounting for the orientation and grain size evolution.

Key words: inorganic non-metallic materials lead titanate sol-gel method ferroelectric polarization oriented attachment growth

Received: 03 May 2020

ZTFLH:

TB34

Fund: National Natural Science Foundation of China(U1909212);Key R&D Program Projects in Zhejiang Province(2020C01124);Fundamental Research Funds for the Central Universities(2020FZZX002);Fundamental Research Funds for the Central Universities(2020-FZZX003)

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	Mengjiao WU
	Zhaohui REN
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	Gaorong HAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.150 OR https://www.cjmr.org/EN/Y2020/V34/I9/650

Fig.1 SEM image of PTO nanoplates(a)，DTA/TGA curves of PTO nanoplates(b) and Cross-sectional ABF-STEM image of PTO nanoplates(c), where Pb (green), Ti (blue) and O (red) atoms have been marked and Unit-cell projection of tetragonal PTO along (010) direction(d), the displacement of Ti and O atoms with respect to the center of the Pb atoms along the c-axis are denoted as δ_Ti and δ_O

Fig.2 XRD spectra of PTO film synthesized with adding different concentrations of nanoplates (a); Enlarged part of 19~35^o in (a) (b) and (100) orientation ratio of PTO films as a function of nanoplates concentration (c)

Fig.3 SEM images of PTO films synthesized by sol-gel method with adding different concentrations of nanoplates (a) 0; (b) 0.2%; (c) 0.5%; (d) 0.8%

Fig.4 Cross-section TEM image of PTO film with 0.5% nanoplates addition (a), Selected area electron diffraction (SAED) patterns of PTO film in (a) (b), Cross-section TEM image of grain boundary area between two grains (c) and High resolution TEM image of the rectangle area in (c) (d)

Fig.5 DTA and TGA curves of PTO precursor gel powder with 0.5% addition of nanoplates

Fig.6 FTIR spectra of PTO precursor gel powder with 0.5% addition of nanoplates after heat treatment in different temperatures

Fig.7 In-situXRD patterns of PTO gel film as a function of temperature (a) Diffraction peaks of (001) and (100); (b) Diffraction peaks of (101) and (110)

Fig.8 SEM image of PTO film areas including nanoplates (a), schematic illustrations of four stages for OA growth (b)~(e) and SEM image of PTO film at the last stage of OA growth (f)

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