Doping and phase transformation of single-crystal pre-perovskite PbTiO3 fibers with TiO6 edge-shared octahedra

Xiao, Zhen; Ren, Zhaohui; Xia, Yang; Liu, Zhenya; Xu, Gang; Li, Xiang; Shen, Ge; Han, Gaorong

doi:10.1039/c2ce25104c

Cited by 10 publications

(5 citation statements)

References 41 publications

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“…The mesoporous perovskite PTO fibers were prepared via a solid phase transition process from pre-perovskite PTO fibers 20 – 22 (Supplementary Figure 1 ). The ~13% density difference between pre-perovskite PTO (6.92 g cm −3 ) and perovskite PTO (7.95 g cm −3 ) has been determined via a calculation based on the unit cell parameters 20 , leading to a volume shrinking after phase transition.…”

Section: Resultsmentioning

confidence: 99%

Mesopores induced zero thermal expansion in single-crystal ferroelectrics

et al. 2018

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For many decades, zero thermal expansion materials have been the focus of numerous investigations because of their intriguing physical properties and potential applications in high-precision instruments. Different strategies, such as composites, solid solution and doping, have been developed as promising approaches to obtain zero thermal expansion materials. However, microstructure controlled zero thermal expansion behavior via interface or surface has not been realized. Here we report the observation of an impressive zero thermal expansion (volumetric thermal expansion coefficient, −1.41 × 10−6 K−1, 293–623 K) in single-crystal ferroelectric PbTiO3 fibers with large-scale faceted and enclosed mesopores. The zero thermal expansion behavior is attributed to a synergetic effect of positive thermal expansion near the mesopores due to the oxygen-based polarization screening and negative thermal expansion from an intrinsic ferroelectricity. Our results show that a fascinating surface construction in negative thermal expansion ferroelectric materials could be a promising strategy to realize zero thermal expansion.

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Section: Resultsmentioning

confidence: 99%

Mesopores induced zero thermal expansion in single-crystal ferroelectrics

et al. 2018

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“…Among ferroelectric oxides, lead titanate (PbTiO 3 or PTO) is a typical material for its simple structure and very large spontaneous polarization . In particular, a single-crystal PTO NW, as a potential candidate for high-performance piezoelectric application, has been reported numerously for its crystal structure, doping modification, and ferroelectric phase transformation in our preview work. − Combined with the facile preparation of ZnO NW, we proposed the design of a flexible nanocomposite with ZnO NW grown on the surface of a perovskite PTO NW via a two-step hydrothermal method. In this work, we report for the first time a high lattice match degree of a single-crystal ferroelectric/semiconductor interface at nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Growth and Bending-Sensitive Photoluminescence of a Flexible PbTiO₃/ZnO Nanocomposite

Jiang

Ren

Yin

et al. 2014

ACS Appl. Mater. Interfaces

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A brushlike PbTiO3 (PTO)/ZnO nanocomposite with ZnO nanowires (NWs) grown epitaxially on the surface of single-crystal ferroelectric tetragonal PTO NWs is successfully fabricated onto a flexible substrate via a two-step hydrothermal process. In this nanocomposite, a ZnO NW grew along [0001] on the (101) plane of the core PTO NW with a lattice mismatch of 1.06% to form an effective ferroelectric/semiconductor interface. It is found that the ultraviolet photoluminescence emission of the nanocomposite could be easily tuned by its bending curvatures at room temperature. This intriguing phenomenon can be understood by the bending-induced polarization field from the PTO NW, which could reduce the bending degree of the energy band of the ZnO NWs through the interface. Throughthe design of an effective interface, this kind of ferroelectric/semiconductor nanocomposite may find potential applications in sensor and piezophotonic nanodevices.

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“…For its phase transformation to perovskite one, this new tetragonal phase was named as a pre-perovskite (PP) phase. [18][19][20][21] The PP-PbTiO 3 nanofibers have been reproducibly prepared in large scale by a polymer-assisted hydrothermal method. Clear lattice image in the edge and inner part of the nanofiber, combined with SEM result, confirms the good single-crystal character of the as-prepared nanofibers.…”

Section: Resultsmentioning

confidence: 99%

Pre-perovskite nanofiber: a new direct-band gap semiconductor with green and near infrared photoluminescence

et al. 2013

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Perovskite-related oxides exhibiting fascinating electric and magnetic properties are important functional materials. We report, for the first time, that pre-perovskite (PP) PbTiO 3 , characterized by one-dimensional (1D) TiO 6 octahedron columns, has a direct-band structure with a gap of 3.20 eV. The faceted single-crystal nanofibers of PP-PbTiO 3 demonstrate strong green and near infrared (NIR) photoluminescence (PL) emission at room temperature, which are intrinsic and subjected to quasi-1D crystal structure and electronic band structure. These nanofibers serving as new direct band-gap semiconductors may find applications in novel optical and optoelectronic devices. Experimental section Preparation and characterizationThe nanofibers of pre-perovskite PbTiO 3 were prepared by a polymer-assisted hydrothermal method. Chemistry grade

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Doping and phase transformation of single-crystal pre-perovskite PbTiO3 fibers with TiO6 edge-shared octahedra

Cited by 10 publications

References 41 publications

Mesopores induced zero thermal expansion in single-crystal ferroelectrics

Mesopores induced zero thermal expansion in single-crystal ferroelectrics

Growth and Bending-Sensitive Photoluminescence of a Flexible PbTiO₃/ZnO Nanocomposite

Pre-perovskite nanofiber: a new direct-band gap semiconductor with green and near infrared photoluminescence

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Doping and phase transformation of single-crystal pre-perovskite PbTiO3 fibers with TiO6 edge-shared octahedra

Cited by 10 publications

References 41 publications

Mesopores induced zero thermal expansion in single-crystal ferroelectrics

Mesopores induced zero thermal expansion in single-crystal ferroelectrics

Growth and Bending-Sensitive Photoluminescence of a Flexible PbTiO3/ZnO Nanocomposite

Pre-perovskite nanofiber: a new direct-band gap semiconductor with green and near infrared photoluminescence

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Growth and Bending-Sensitive Photoluminescence of a Flexible PbTiO₃/ZnO Nanocomposite