Microstructure development and dielectric properties of hydrothermal BaTiO3 thin films

McCormick, M.; Slamovich, Elliott B.

doi:10.1016/s0955-2219(03)00022-0

Cited by 62 publications

(54 citation statements)

References 29 publications

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“…This could not have been caused by a leakage current since the leakage currents for the BTO films on the Pt/Ti/SiO 2 and Pt/C/Pt/Ti/SiO 2 structures shown in Fig. 7 were as small as typical leakage currents [11], [20]. Therefore, the insufficiently saturated P-E characteristics with small hysteresis may be due to the small grain size, as observed in Fig.…”

Section: Resultsmentioning

confidence: 90%

Fabrication and Characterization of BaTiO₃/Pt/C/Pt/Ti/SiO₂ Structures

Dai-ichiro¹,

Kinoshita²,

Kishida³

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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We deposited BaTiO 3 (BTO) films by the rf magnetron sputtering method on Pt/C/Pt/Ti/SiO 2 substrates with carbon (C) film. Annealing the Pt/C/Pt/Ti/SiO 2 substrates in a mixture gas of argon and oxygen caused the Pt films on the C films to become semi-freestanding. The BTO films deposited on the Pt/C/Pt/Ti/SiO 2 substrates had better polarization-electric field (P-E) characteristics than those deposited on the Pt/Ti/SiO 2 substrates. Using substrates including C films is an effective way to obtain BTO films with good P-E characteristics.

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Section: Resultsmentioning

confidence: 90%

Fabrication and Characterization of BaTiO₃/Pt/C/Pt/Ti/SiO₂ Structures

Dai-ichiro¹,

Kinoshita²,

Kishida³

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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“…[ 22,23 ] The ultralong ferroelectric BaTiO 3 NW arrays synthesized by hydrothermal process are not ideal insulator ceramic as they contain hydroxyl groups that can cause them to have a fi nite conductivity. [ 24,25 ] Therefore, PEDOT:PSS and BaTiO 3 NW arrays confi guration analogous to PEDOT:PSS and semiconductive ZnO NW arrays confi guration as reported by Briscoe et al [26][27][28] is used as it assists to reduce the rate of screening of polarization charge suffi ciently for a higher piezoelectric response to be extracted. Consequently, the Ti foil with PEDOT: PSS layer is overlaid on top of the NW arrays to function as the other electrode.…”

Section: Doi: 101002/aenm201301660mentioning

confidence: 87%

A Low‐Frequency Energy Harvester from Ultralong, Vertically Aligned BaTiO₃ Nanowire Arrays

Koka

Sodano

2014

Advanced Energy Materials

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growth of ultralong, vertically aligned BaTiO 3 NW arrays and demonstrated in a high sensitivity NEMS accelerometer. [ 19 ] In this communication, a novel NEMS energy harvester is fabricated using this newly developed process for ultralong, vertically aligned BaTiO 3 NW arrays which has a low resonant frequency (below 200 Hz) and its AC power harvesting capacity from low amplitude base vibrations is demonstrated. The design and fabrication of low resonant frequency vibrational energy harvesters has been challenging in the fi eld of MEMS/ NEMS since the high stiffness of the structures results in resonant frequency often greater than 1 kHz. [ 20 ] However, ambient mechanical vibrations usually exist in the 1 Hz to 1 kHz range and thus high aspect ratio nanostructures are benefi cial to enable effi cient energy conversion. Through the use of this new process for the growth of highly compliant, ultralong (≈40 µm long) BaTiO 3 NW arrays, it is shown that NW based energy harvesters capable of harnessing this low frequency ambient energy can be constructed. Resistive impedance matching at the device's resonant frequency is used to identify the peak root mean square (rms) value of AC power and peak power density observed from the long BaTiO 3 NW array energy harvester that is driven by an rms sinusoidal base acceleration of only 0.25 g.Ultralong (≈40 µm) vertically aligned BaTiO 3 NW arrays are grown on an oxidized Ti substrate using an inexpensive two-step hydrothermal process that allows for control over the aspect ratio of the resulting NW arrays by tuning the reaction parameters in the synthesis procedure. BaTiO 3 NW arrays are synthesized via temperature assisted Ba 2+ ion diffusion into single crystal vertically aligned sodium titanate NW arrays that act as templates during the second hydrothermal reaction. Figure S1 (Supporting Information) shows the detailed X-ray diffraction (XRD) pattern of all materials utilized in the synthesis of long BaTiO 3 NW arrays. The dimensions of the BaTiO 3 NWs are controlled using reaction parameters so that the NW arrays are suffi ciently rigid to avoid wicking on the top surface from capillary forces during the drying process after synthesis. [ 21 ] The resulting NWs have a length of ≈40 µm and a diameter of ≈630 nm. A detailed analysis of the microstructure of the aligned array of NWs is performed using a scanning electron microscope (SEM) as shown in Figure 1 a. The crystallographic structure of the NWs is analyzed using X-ray diffraction (XRD) and the XRD pattern from the NWs match with BaTiO 3 (JCPDS No. 5-0626) as shown in Figure 1 b. Next, the BaTiO 3 NW based energy harvester is fabricated through the removal of the as-synthesized vertically aligned BaTiO 3 NW arrays from the oxidized Ti substrate that was used for their growth. The assynthesized BaTiO 3 NW arrays' surface can be easily released from the original growth substrate after immersing in dilute HCl solution and drying in room temperature after washing Mechanical vibrations are an abundantly available renewable ...

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“…Three cases studies are discussed, i.e., the preparation of ultrafine barium 2 was used not only as a source of Ba but also to adjust pH and then to promote solubility [90][91]93]. Precursors were charged into a teflon-lined autoclave.…”

Section: Surfactant-assisted Hydrothermal Crystallizationmentioning

confidence: 99%

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Ortíz-Landeros¹,

Gómez-Yáñez²,

López-Juárez³

et al. 2012

J Adv Ceram

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Abstract:The present article aims to give a brief overview about the advantages of the hydrothermal crystallization method for the synthesis of advanced ceramics. Emphasis is given, not only on the conventional hydrothermal crystallization, but also on some of its variants; such as ultrasound-assisted, electrochemical-assisted, microwave-assisted and surfactant-assisted hydrothermal methods which open up new opportunities for the synthesis of ceramic materials with novel properties demanded for advanced applications. In the current work the synthesis of barium titanate (BaTiO 3 ), lithium metasilicate (Li 2 SiO 3 ) and sodium-potassium niobate (Na, K)NbO 3 powders are reported as cases of study.

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Microstructure development and dielectric properties of hydrothermal BaTiO3 thin films

Cited by 62 publications

References 29 publications

Fabrication and Characterization of BaTiO₃/Pt/C/Pt/Ti/SiO₂ Structures

Fabrication and Characterization of BaTiO₃/Pt/C/Pt/Ti/SiO₂ Structures

A Low‐Frequency Energy Harvester from Ultralong, Vertically Aligned BaTiO₃ Nanowire Arrays

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

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Microstructure development and dielectric properties of hydrothermal BaTiO3 thin films

Cited by 62 publications

References 29 publications

Fabrication and Characterization of BaTiO3/Pt/C/Pt/Ti/SiO2 Structures

Fabrication and Characterization of BaTiO3/Pt/C/Pt/Ti/SiO2 Structures

A Low‐Frequency Energy Harvester from Ultralong, Vertically Aligned BaTiO3 Nanowire Arrays

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

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Fabrication and Characterization of BaTiO₃/Pt/C/Pt/Ti/SiO₂ Structures

Fabrication and Characterization of BaTiO₃/Pt/C/Pt/Ti/SiO₂ Structures

A Low‐Frequency Energy Harvester from Ultralong, Vertically Aligned BaTiO₃ Nanowire Arrays