Temperature dependent structural, dielectric, Raman, piezoresponse and photoluminescence investigations in sol-gel derived BCZT ceramics

Coondoo, Indrani; Крылов, А. С.; Sharma, Dhananjay K.; Krylova, S. N.; Аликин, Д. О.; Kumar, Jitendra; Mirzorakhimov, A. A.; Melnikova, N. V.; Soares, M.J.; Kholkin, Andréi L.

doi:10.1016/j.matchemphys.2021.125526

Cited by 13 publications

(4 citation statements)

References 73 publications

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“…Hence, the PL emission may attributed to emission from localized defect states close to the band edges, in addition to the band transitions. These localized defects include lattice distortions, defects or impurity levels, and self-trapped excitons (STEs) . The STEs in the studied compositions are created by the oxygen vacancies present in the samples.…”

Section: Resultsmentioning

confidence: 99%

“…These localized defects include lattice distortions, defects or impurity levels, and self-trapped excitons (STEs). 33 The STEs in the studied compositions are created by the oxygen vacancies present in the samples. The maximum emission intensity obtained for the 5BTBNN sample is much larger than the PL emission in the 5BTBNNδ sample, inferring that the 5BTBNN sample has more oxygen vacancy.…”

Section: Optical Propertiesmentioning

confidence: 99%

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Cationic Vacancies Induced Enhanced Light Absorption with Controlled Leakage Current in Perovskite Ferroelectric Oxides

Sarath,

Murugavel

2024

ACS Appl. Eng. Mater.

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Visible-light-absorbing ferroelectric perovskite materials have shown promising potential in energy-harvesting applications. However, most of the ferroelectric systems have a large band-gap. The attempts to reduce their band-gap resulted in a large leakage current, which undermines their ferroelectric characteristics. In this study, traditional large-band-gap ferroelectric BaTiO3 (BTO) is modified to show a tunable band-gap capable of visible-light absorption with better leakage current characteristics. This is achieved by incorporating the cationic/anionic vacancies through transition metal Nb and Ni ion substitutions. Here, a comparative study of two BTO-based compositions having differences in the concentration of oxygen and cationic vacancies by varying the donor (Nb)–acceptor (Ni) doping concentration is carried out. Interestingly, the results show that the sample having more cationic vacancy concentration exhibits large band-gap reduction, enhanced light absorption, low leakage current magnitude, better ferroelectric hysteresis loop, and switchable photovoltaic response. Notably, this study unveils that oxygen defects are not a necessary condition for band-gap tuning. Overall, the present work opens a pathway to tune the optical band-gap without deteriorating the ferroelectric properties by controlling donor–acceptor dopant concentration.

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Section: Resultsmentioning

confidence: 99%

Section: Optical Propertiesmentioning

confidence: 99%

Cationic Vacancies Induced Enhanced Light Absorption with Controlled Leakage Current in Perovskite Ferroelectric Oxides

Sarath,

Murugavel

2024

ACS Appl. Eng. Mater.

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“…The peaks of Ti 2p peaking at 457.98 and 463.69 eV for BT, and 457.96 and 463.67 eV for BCTZ 7 , as seen in Figure 2g, refer to the core levels of Ti 4+ 2p 3/2 and Ti 4+ 2p 1/2 , respectively. [16] Figure 2h displays XPS spectrum of O 1s valence state and their fitting curves, which contain one main peak conforming with the oxygen in lattice (529.07 eV for BT and BCTZ 7 ), two satellite peak induced by chemisorbed hydroxyl (-OH) and oxygen vacancies (530.88 eV for BT and 530.84 eV for BCTZ 7 ), and surface adsorbed H 2 O (531.83 eV for BT and 532.64 eV for BCTZ 7 ). [17] Note that the intensity ratio of satellite peak to the main peak for BCTZ 7 (B2/B1) is stronger than that of BT (A2/A1), implying that the content of -OH and/or oxygen vacancies increase in BCTZ 7 .…”

Section: (4 Of 13)mentioning

confidence: 99%

High‐Efficiency Reactive Oxygen Species Generation by Multiphase and TiO₆ Distortion‐Mediated Superior Piezocatalysis in Perovskite Ferroelectrics

Huang

Zhao

et al. 2023

Adv Funct Materials

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Piezocatalysis, governed by piezo‐potential within piezoelectrics, has gained prominence for reactive oxygen species (ROS) generation, which is significant to environmental and biological applications. However, designing piezocatalysts with excellent piezocatalytic performance in a wide temperature and efficient charge carrier separation ability is still challenging. Herein, eco‐friendly BaTiO3 (BT)‐based perovskite ferroelectrics with tailored multiphase coexistence in a wide temperature range are constructed to boost higher piezoelectricity and large piezo‐potential, which is attributed to decreased polarization anisotropy by flat Gibbs energy profile. Elevated piezo‐potential in designed BT‐based piezocatalyst guarantees high‐efficient generation rate of •OH (200 µmol g−1 h−1) and •O2− (40 µmol g−1 h−1) by ultrasound stimulation, which is 3.5 times more than that of pure BT. Besides, piezocatalytic capacity to degrade dye wastewater shows a rate constant of 0.0182 min−1 and gives an antibacterial rate of 95% within 30 min for eliminating E. coli. Theoretical simulations validate that the local distortion of TiO6 octahedra also contributes to piezocatalytic performance by inducing electron–hole pairs separation in real space, and better response to slight structural deformation. This work is important to design high‐performance piezocatalysts with high‐efficiency ROS generation for sewage treatment and sonodynamic therapy.

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“…Before the centenary year of this discovery in 2028, we can have a look at how Raman spectroscopy , has developed and has improved the understanding in physical chemistry. It is well-known that the Raman effect explores the molecular vibrations/phonons in a molecule/material, resulting from a weak scattering process when incident radiation interacts with the molecular geometry and therefore offers a detailed molecular-level picture from the scattered radiations. , It will be our privilege to witness and celebrate the 100th year of the success of the Raman effect in 2028. Consequently, the timeline of the Raman effect and spectroscopy in physical chemistry, from the past to the present, has been highlighted here from this perspective, which also helps us in chalking out our expectations and preparing a “To Do List” for the future.…”

Section: Introductionmentioning

confidence: 99%

Developments in Raman Spectromicroscopy for Strengthening Materials and Natural Science Research: Shaping the Future of Physical Chemistry

Pathak,

Rani,

Sati

et al. 2024

ACS Phys. Chem Au

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Spectroscopic techniques, especially Raman spectroscopy, cover a large subset in the teaching and research domain of physical chemistry. Raman spectroscopy, and other Raman based techniques, establishes itself as a powerful analytical tool with diverse applications across scientific, industrial, and natural science (including biology and pharmacy) fields and helps in the progress of physical chemistry. Recent advancements and future prospects in Raman spectroscopy, focusing on key areas of innovation and potential directions for research and development, have been highlighted here along with some of the challenges that need to be addressed to prepare Raman based techniques for the future. Significant progress has been made in enhancing the sensitivity, spatial resolution, and time resolution of Raman spectroscopy techniques. Raman spectroscopy has applications in all areas of research but especially in biomedical applications, where Raman spectroscopy holds a great promise for noninvasive or minimally invasive diagnosis, tissue imaging, and drug monitoring. Improvements in instrumentation and laser technologies have enabled researchers to achieve higher sensitivity levels, investigate smaller sample areas with improved spatial resolution, and capture dynamic processes with high temporal resolution. These advancements have paved the way for a deeper understanding of molecular structure, chemical composition, and dynamic behavior in various materials and biological systems. It is high time that we consider whether Raman based techniques are ready to be improved based on the strength of the current era of AI/ML and quantum technology.

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Temperature dependent structural, dielectric, Raman, piezoresponse and photoluminescence investigations in sol-gel derived BCZT ceramics

Cited by 13 publications

References 73 publications

Cationic Vacancies Induced Enhanced Light Absorption with Controlled Leakage Current in Perovskite Ferroelectric Oxides

Cationic Vacancies Induced Enhanced Light Absorption with Controlled Leakage Current in Perovskite Ferroelectric Oxides

High‐Efficiency Reactive Oxygen Species Generation by Multiphase and TiO₆ Distortion‐Mediated Superior Piezocatalysis in Perovskite Ferroelectrics

Developments in Raman Spectromicroscopy for Strengthening Materials and Natural Science Research: Shaping the Future of Physical Chemistry

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Temperature dependent structural, dielectric, Raman, piezoresponse and photoluminescence investigations in sol-gel derived BCZT ceramics

Cited by 13 publications

References 73 publications

Cationic Vacancies Induced Enhanced Light Absorption with Controlled Leakage Current in Perovskite Ferroelectric Oxides

Cationic Vacancies Induced Enhanced Light Absorption with Controlled Leakage Current in Perovskite Ferroelectric Oxides

High‐Efficiency Reactive Oxygen Species Generation by Multiphase and TiO6 Distortion‐Mediated Superior Piezocatalysis in Perovskite Ferroelectrics

Developments in Raman Spectromicroscopy for Strengthening Materials and Natural Science Research: Shaping the Future of Physical Chemistry

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High‐Efficiency Reactive Oxygen Species Generation by Multiphase and TiO₆ Distortion‐Mediated Superior Piezocatalysis in Perovskite Ferroelectrics