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High Pressure Synthesis in Materials Science
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High Pressure Synthesis in Materials Science

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

Deadline for manuscript submissions: closed (31 March 2021) | Viewed by 12036

Special Issue Editor

Dr. Alain Largeteau

E-Mail Website
Guest Editor
Department of High Pressure, CNRS, Univ. 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,

High pressure (HP) is an integral part of various domains of science. The combination of temperature with pressure results in applications in several already existing fields, such as steam sterilization by autoclave in medicine, single crystal of a-quartz SiO2 by hydrothermal crystal growth in inorganic chemistry, polymerization by reactor in organic chemistry, Pascalization of biologic materials by high hydrostatic vessel in organic chemistry or pharmacy. In inorganic materials chemistry, pressure allows, in addition to temperature, to sinter/consolidate/densify for obtaining solid material in the form generally as ceramic (sintering phenomena) or as monoliths (consolidation phenomena) with dense (by densification) or porous (by interparticle bridging) form. Innovative HP processes were designed for the high pressure syntheses related to: high pressure structural phase (e.g., diamonds instead of graphite) or low temperature structural phase (e.g., for SiO2: quartz instead of the other polymorphs, or amorphous instead of crystallized), consolidation of porous or dense biocomposites, sintering at temperature higher than their thermal decomposition, preservation of hydrates from the raw precursor, initiating a new finer microstructure, higher densification, improvement or driving the chemical reaction, assembling of materials with different thermal stability (e.g., multimaterials). Recently, innovative high pressure processes have emerged by the combination of different technologies opening new possibility for obtaining these advanced functional inorganic materials such as: high pressure & spark plasma sintering, cold isostatic pressure & minus temperature, hydrothermal synthesis & sintering.

The upcoming Special Issue, entitled “High Pressure Synthesis in Materials Science” aims to cover an overview of the innovation in high pressure processes/technologies for the synthesis of advanced functional inorganic materials. 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. Alain Largeteau
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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

  • sintering
  • densification
  • consolidation
  • crystallization
  • polymorphism
  • innovative high pressure processes

Published Papers (4 papers)

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Research

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16 pages, 4684 KiB  
Article
Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press
by Michał Bembenek and Andrzej Uhryński
Materials 2021, 14(7), 1770; https://doi.org/10.3390/ma14071770 - 03 Apr 2021
Cited by 9 | Viewed by 2106
Abstract
The unit pressure in the fine-grained material consolidation process in the roller press can reach over hundred MPa and is a parameter which results, among other things, from the properties of the consolidated material and the compaction unit geometry. Its value changes depending [...] Read more.
The unit pressure in the fine-grained material consolidation process in the roller press can reach over hundred MPa and is a parameter which results, among other things, from the properties of the consolidated material and the compaction unit geometry. Its value changes depending on the place on the molding surface. Generating different pressure on the surface of briquettes makes their compaction different. One’s own and other researchers’ experience shows that, in the case of exerting high pressure on the merged fine-grained material, the higher unit pressure exerted on the material, the higher temperature of the consolidated material is. The temperature distribution on the surface of the briquettes can testify the locally exerted pressure on the briquette. The stress distribution in the briquetting material is still a subject of research. The article includes thermography studies of the briquetting process of four material mixtures. Thermal images of briquettes were taken immediately after they left the compaction zone as well as forming rollers. The obtained thermograms and temperature variability at characteristic points of the surface of briquettes were analyzed. The correlation between the temperature distribution and the stress distribution in the briquettes was determined. Full article
(This article belongs to the Special Issue High Pressure Synthesis in Materials Science)
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Review

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36 pages, 3532 KiB  
Review
A Review of Binderless Polycrystalline Diamonds: Focus on the High-Pressure–High-Temperature Sintering Process
by Jérémy Guignard, Mythili Prakasam and Alain Largeteau
Materials 2022, 15(6), 2198; https://doi.org/10.3390/ma15062198 - 16 Mar 2022
Cited by 13 | Viewed by 3548
Abstract
Nowadays, synthetic diamonds are easy to fabricate industrially, and a wide range of methods were developed during the last century. Among them, the high-pressure–high-temperature (HP–HT) process is the most used to prepare diamond compacts for cutting or drilling applications. However, these diamond compacts [...] Read more.
Nowadays, synthetic diamonds are easy to fabricate industrially, and a wide range of methods were developed during the last century. Among them, the high-pressure–high-temperature (HP–HT) process is the most used to prepare diamond compacts for cutting or drilling applications. However, these diamond compacts contain binder, limiting their mechanical and optical properties and their substantial uses. Binderless diamond compacts were synthesized more recently, and important developments were made to optimize the P–T conditions of sintering. Resulting sintered compacts had mechanical and optical properties at least equivalent to that of natural single crystal and higher than that of binder-containing sintered compacts, offering a huge potential market. However, pressure–temperature (P–T) conditions to sinter such bodies remain too high for an industrial transfer, making this the next challenge to be accomplished. This review gives an overview of natural diamond formation and the main experimental techniques that are used to synthesize and/or sinter diamond powders and compact objects. The focus of this review is the HP–HT process, especially for the synthesis and sintering of binderless diamonds. P–T conditions of the formation and exceptional properties of such objects are discussed and compared with classic binder-diamonds objects and with natural single-crystal diamonds. Finally, the question of an industrial transfer is asked and outlooks related to this are proposed. Full article
(This article belongs to the Special Issue High Pressure Synthesis in Materials Science)
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24 pages, 6086 KiB  
Review
In Situ High-Pressure Synthesis of New Outstanding Light-Element Materials under Industrial P-T Range
by Yann Le Godec and Alexandre Courac
Materials 2021, 14(15), 4245; https://doi.org/10.3390/ma14154245 - 29 Jul 2021
Cited by 3 | Viewed by 2985
Abstract
High-pressure synthesis (which refers to pressure synthesis in the range of 1 to several GPa) adds a promising additional dimension for exploration of compounds that are inaccessible to traditional chemical methods and can lead to new industrially outstanding materials. It is nowadays a [...] Read more.
High-pressure synthesis (which refers to pressure synthesis in the range of 1 to several GPa) adds a promising additional dimension for exploration of compounds that are inaccessible to traditional chemical methods and can lead to new industrially outstanding materials. It is nowadays a vast exciting field of industrial and academic research opening up new frontiers. In this context, an emerging and important methodology for the rapid exploration of composition-pressure-temperature-time space is the in situ method by synchrotron X-ray diffraction. This review introduces the latest advances of high-pressure devices that are adapted to X-ray diffraction in synchrotrons. It focuses particularly on the “large volume” presses (able to compress the volume above several mm3 to pressure higher than several GPa) designed for in situ exploration and that are suitable for discovering and scaling the stable or metastable compounds under “traditional” industrial pressure range (3–8 GPa). We illustrated the power of such methodology by (i) two classical examples of “reference” superhard high-pressure materials, diamond and cubic boron nitride c-BN; and (ii) recent successful in situ high-pressure syntheses of light-element compounds that allowed expanding the domain of possible application high-pressure materials toward solar optoelectronic and infra-red photonics. Finally, in the last section, we summarize some perspectives regarding the current challenges and future directions in which the field of in situ high-pressure synthesis in industrial pressure scale may have great breakthroughs in the next years. Full article
(This article belongs to the Special Issue High Pressure Synthesis in Materials Science)
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15 pages, 5957 KiB  
Review
Metastable Materials Accessed under Moderate Pressure Conditions (P ≤ 3.5 GPa) in a Piston-Cylinder Press
by Javier Gainza, Federico Serrano-Sánchez, João Elias F. S. Rodrigues, Norbert Marcel Nemes, José Luis Martínez and José Antonio Alonso
Materials 2021, 14(8), 1946; https://doi.org/10.3390/ma14081946 - 13 Apr 2021
Cited by 8 | Viewed by 2234
Abstract
In this review, we describe different families of metastable materials, some of them with relevant technological applications, which can be stabilized at moderate pressures 2–3.5 GPa in a piston-cylinder press. The synthesis of some of these systems had been previously reported under higher [...] Read more.
In this review, we describe different families of metastable materials, some of them with relevant technological applications, which can be stabilized at moderate pressures 2–3.5 GPa in a piston-cylinder press. The synthesis of some of these systems had been previously reported under higher hydrostatic pressures (6–10 GPa), but can be accessed under milder conditions in combination with reactive precursors prepared by soft-chemistry techniques. These systems include perovskites with transition metals in unusual oxidation states (e.g., RNiO3 with Ni3+, R = rare earths); double perovskites such as RCu3Mn4O12 with Jahn–Teller Cu2+ ions at A sites, pyrochlores derived from Tl2Mn2O7 with colossal magnetoresistance, pnictide skutterudites MxCo4Sb12 (M = La, Yb, Ce, Sr, K) with thermoelectric properties, or metal hydrides Mg2MHx (M = Fe, Co, Ni) and AMgH3 (A: alkali metals) with applications in hydrogen storage. The availability of substantial amounts of sample (0.5–1.5 g) allows a complete characterization of the properties of interest, including magnetic, transport, thermoelectric properties and so on, and the structural characterization by neutron or synchrotron X-ray diffraction techniques. Full article
(This article belongs to the Special Issue High Pressure Synthesis in Materials Science)
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