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Advances in Hydrothermal/Solvothermal Processing

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 2943

Special Issue Editors


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Guest Editor
Department of High Pressure, CNRS, Université de Bordeaux, ICMCB, UMR 5026, F-33600 Pessac, France
Interests: high-pressure syntheses; materials fabrication; composites; ceramics
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Department of High Pressure, CNRS, Université de Bordeaux, ICMCB, UMR 5026, F-33600 Pessac, France
Interests: material synthesis under high pressure in solid, liquid and gas phase; design of devices under high pressure, effect of high pressure processing on materials chemistry, materials science, biosciences; hydro/solvothermal processes (crystal growth, powder synthesis, cold sintering); densification (cold isostatic pressure, freeze isostatic pressure); sintering (conventional spark plasma sintering (SPS), under high pressure (HP-SPS))
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Hydrothermal processes are an integral part of the High-Pressure (HP) domain. Fluid under the combination of temperature and pressure is involved in applications in several existing fields, such as obtaining single crystals of a-quartz SiO2 by hydrothermal crystal growth. In materials science, hydrothermal pressure, in addition to temperature, allows obtaining solid material by sintering, consolidation, or densification. The solid materials obtained by sintering phenomena are generally in ceramic form, while consolidation phenomena result in monoliths with dense (by densification) or porous (by interparticle bridging) forms. Innovative hydrothermal/solvothermal processes were designed for the growth of single crystals at low temperature and also for the fabrication of hybrid materials by sintering. Recently, innovative hydrothermal/solvothermal processes have emerged from the combination of technologies, opening new possibilities for obtaining these advanced functional materials.

The upcoming Special Issue, entitled “Advances in Hydrothermal/Solvothermal processing”, aims to cover an overview of the innovation in hydrothermal/solvothermal processes for the synthesis of advanced functional ceramics/composites and single crystals. To this end, it is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are welcome. 

Dr. Mythili Prakasam
Dr. Alain Largeteau
Guest Editors

Manuscript Submission Information

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Keywords

  • sintering
  • densification
  • consolidation
  • crystallization
  • polymorphism
  • hydrothermal/solvothermal processes

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Published Papers (1 paper)

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Research

12 pages, 6405 KiB  
Article
A Facile and Eco-Friendly Hydrothermal Synthesis of High Tetragonal Barium Titanate with Uniform and Controllable Particle Size
by Tingting Wang, Xiaoxiao Pang, Bin Liu, Jie Liu, Jing Shen and Cheng Zhong
Materials 2023, 16(11), 4191; https://doi.org/10.3390/ma16114191 - 5 Jun 2023
Cited by 2 | Viewed by 2549
Abstract
The preparation of tetragonal barium titanate (BT) powders with uniform and suitable particle sizes is a significant prerequisite for ultra-thin and highly integrated multilayer ceramic capacitors (MLCCs). However, the balance of high tetragonality and controllable particle size remains a challenge, which limits the [...] Read more.
The preparation of tetragonal barium titanate (BT) powders with uniform and suitable particle sizes is a significant prerequisite for ultra-thin and highly integrated multilayer ceramic capacitors (MLCCs). However, the balance of high tetragonality and controllable particle size remains a challenge, which limits the practical application of BT powders. Herein, the effects of different proportions of hydrothermal medium composition on the hydroxylation process are explored to obtain high tetragonality. The high tetragonality of BT powders under the optimal solvent condition of water:ethanol:ammonia solution of 2:2:1 is around 1.009 and increases with the particle size. Meanwhile, the good uniformity and dispersion of BT powders with particle sizes of 160, 190, 220, and 250 nm benefit from the inhibition of ethanol on the interfacial activity of BT particles (BTPs). The core–shell structure of BTPs is revealed by different lattice fringe spacings of the core and edge and the crystal structure by reconstructed atomic arrangement, which reasonably explains the trend between tetragonality and average particle size. These findings are instructive for the related research on the hydrothermal process of BT powders. Full article
(This article belongs to the Special Issue Advances in Hydrothermal/Solvothermal Processing)
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