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Elaboration of New Materials Using Hydrothermal Methods

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (20 March 2023) | Viewed by 2826

Special Issue Editors


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Guest Editor
National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara, Romania
Interests: dye sensitized solar cell; agrivoltaics; nanotechnology; oxide semiconductor; thin films deposition
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara, Romania
Interests: dye sensitized solar cell; perovskite solar cell; nanotechnology; plasmonics solar cells; indoor photovoltaics; oxide semiconductor; thin films deposition
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Hydrothermal methods still represent a “black box” technology that is based on the crystallization of materials directly from aqueous solution via controlling the thermodynamic (temperature, pressure, solution pH and the chemical composition of precursors) and nonthermodynamic variables. The unique pressure-temperature interaction in hydrothermal solutions can be used as a basis for controlling the rate and uniformity of nucleation and growth, allowing the size, morphology, stoichiometry, polymorphism, metastable phases, and aggregation to be controlled in designing the obtained materials. Additionally, the ability to produce new materials is conditioned by understanding the solution thermodynamics of the aqueous medium and prediction of the phase equilibrium and mechanisms of crystallization through thermodynamic modeling of the hydrothermal systems.

Therefore, this Special Issue intends to gather state-of-the-art advances in research on the hydrothermal synthesis of new materials alongside continuous materials production, hydrothermal recycling technology, and the modeling and simulation of hydrothermal synthesis. Original and review papers on the scientific fundamentals and technological applications of the hydrothermal synthesis of new materials are welcome.

Dr. Marinela Miclau
Dr. Daniel Horatiu Ursu
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • hydrothermal synthesis
  • metastable phases
  • supercritical hydrothermal growth
  • continuous-flow hydrothermal synthesis
  • modeling and simulation of hydrothermal synthesis
  • hydrothermal carbonization
  • hydrothermal recycling technology

Published Papers (2 papers)

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Editorial

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2 pages, 170 KiB  
Editorial
Elaboration of New Materials Using Hydrothermal Methods
by Daniel Ursu, Cristian Casut and Marinela Miclau
Materials 2022, 15(21), 7792; https://doi.org/10.3390/ma15217792 - 4 Nov 2022
Cited by 2 | Viewed by 1069
Abstract
“Elaboration of New Materials Using Hydrothermal Methods” is a new and open Special Issue of Materials, which aims to publish original research and review papers on that present state-of-the-art advances in the research on the hydrothermal synthesis of new materials [...] Full article
(This article belongs to the Special Issue Elaboration of New Materials Using Hydrothermal Methods)

Research

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10 pages, 3635 KiB  
Article
Increasing Electrical Resistivity of P-Type BiFeO3 Ceramics by Hydrogen Peroxide-Assisted Hydrothermal Synthesis
by Cristian Casut, Raul Bucur, Daniel Ursu, Iosif Malaescu and Marinela Miclau
Materials 2023, 16(8), 3130; https://doi.org/10.3390/ma16083130 - 16 Apr 2023
Viewed by 1153
Abstract
Bismuth ferrite (BiFeO3, BFO) is still widely investigated both because of the great diversity of its possible applications and from the perspective of intrinsic defect engineering in the perovskite structure. Defect control in BiFeO3 semiconductors could provide a key technology [...] Read more.
Bismuth ferrite (BiFeO3, BFO) is still widely investigated both because of the great diversity of its possible applications and from the perspective of intrinsic defect engineering in the perovskite structure. Defect control in BiFeO3 semiconductors could provide a key technology for overcoming undesirable limitations, namely, a strong leakage current, which is attributed to the presence of oxygen vacancies (VO) and Bi vacancies (VBi). Our study proposes a hydrothermal method for the reduction of the concentration of VBi during the ceramic synthesis of BiFeO3.Using hydrogen peroxide (H2O2) as part of the medium, p-type BiFeO3 ceramics characterized by their low conductivity were obtained. Hydrogen peroxide acted as the electron donor in the perovskite structure, controlling VBi in the BiFeO3 semiconductor, which caused the dielectric constant and loss to decrease along with the electrical resistivity. The reduction of Bi vacancies highlighted by a FT-IR and Mott—Schottky analysis has an expected contribution to the dielectric characteristic. A decrease in the dielectric constant (with approximately 40%) and loss (3 times) and an increase of the electrical resistivity (by 3 times) was achieved by the hydrogen peroxide-assisted hydrothermal synthesized BFO ceramics, as compared with the hydrothermal synthesized BFOs. Full article
(This article belongs to the Special Issue Elaboration of New Materials Using Hydrothermal Methods)
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