Continuous BaTi1−yZryO3 (0≤y≤1) nanocrystals synthesis in supercritical fluids for nanostructured lead-free ferroelectric ceramics

Philippot, Gilles; Albino, Marjorie; Chung, U‐Chan; Josse, Michaël; Elissalde, Catherine; Maglione, Mario; Aymonier, Cyril

doi:10.1016/j.matdes.2015.07.111

Cited by 35 publications

(43 citation statements)

References 49 publications

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“…This synthesis route was used to prepare all the compositions belonging to the BST and BaTi 1Àx Zr x O 3 (BTZ) systems. 20,21,[39][40][41][42] Nanoparticles with a high purity, crystallinity and grain size below 20 nm as well as narrow particle size distribution can be synthesized under supercritical conditions using a continuousflow tubular reactor ( Fig. 1(d)).…”

Section: Composites Designed At the Nanoscalementioning

confidence: 99%

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

et al. 2015

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Breakthroughs can be expected in multi-component ceramics by adjusting the phase assembly and the micro-nanostructure. Controlling the architecture of multi-materials at different scales is still challenging and provides a great opportunity to broaden the range of functionalities in the field of ferroelectric-based ceramics. We used the potentialities of Spark Plasma Sintering (SPS) to control a number of key parameters regarding the properties: anisotropy, interfaces, grain size and strain effects. The flexibility of the wet and supercritical chemistry routes associated with the versatility of SPS allowed designing new ferroelectric composite ceramics at different scales. These approaches are illustrated through various examples based on our work on ferroelectric/dielectric composites.

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Section: Composites Designed At the Nanoscalementioning

confidence: 99%

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

et al. 2015

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“…1 Such technology is now used for the continuous synthesis of a wide range of high quality inorganic nanomaterials, such as ZnO, BaTi 1−y Zr y O 3 and GaN, for example. [9][10][11] It is commonly perceived that the use of supercritical fluids results in an inherently "green" synthesis approach. 12 For example, supercritical CO 2 is seen as a benign and non-toxic solvent that can replace more noxious organic volatile solvents without further increased anthropogenic greenhouse gas emissions.…”

Section: Introductionmentioning

confidence: 99%

Anticipatory life-cycle assessment of supercritical fluid synthesis of barium strontium titanate nanoparticles

et al. 2016

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Supercritical fluid synthesis offers an attractive and unique method to produce metal oxide nanoparticles such as barium strontium titanate (Ba 1−x Sr x TiO 3 with 0 ≤ x ≤ 1). This synthesis pathway has the advantage of producing high quality, highly crystalline nanoparticles in a narrow size range, with accurate control of the elemental composition not easily afforded by other methods of production. Coupled with moderate reaction temperatures and short reaction times, this method could be an environmentally preferred synthesis route compared to conventional synthesis pathways. This paper examines the potential environmental impacts leading from the lab-scale supercritical synthesis of 1 kg of Ba 0.6 Sr 0.4 TiO 3 nanoparticles of an average size 16 nm using the approach of an anticipatory life-cycle assessment. A cradle-to-gate assessment was completed, estimating the impacts across resource extraction, material processing, and production of the nanoparticles, while excluding any associated use-phase or end-of-life considerations.The life-cycle assessment highlights a number of ways by which the environmental profile of the supercritical synthesis of barium strontium titanate nanoparticles could be improved. Lab-scale synthesis was bound by physical constraints of the reactor, whereby the precursor concentration was kept artificially low. Being able to synthesize nanoparticles with precursor concentrations of 0.1 and 1.0 molar would reduce the average life-cycle impacts by nearly 81% and 95%, respectively. Additionally, the recovery and reuse of solvents at high recycling rates (e.g. 90%) could reduce average life-cycle impacts by 56%. At high precursor concentrations and solvent recycling rates, the environmental performance was further limited by the precursors, namely barium and titanium alkoxides, which have high upstream life-cycle demands (i.e. isopropanol production and metal processing). General impact reductions were seen as the ratio of strontium : barium increased. Further reductions could be achieved by replacing the barium, strontium and titanium alkoxides with precursors having better life-cycle profiles such as barium and strontium acetates or barium and strontium hydroxides.

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“…Co-precipitation via oxalate [16] and citrates [17] can produce BaTiO 3 at a lower temperature easier than other methods. Alternative and modified techniques also were proposed such as sonochemical [18], supercritical fluid [19], sol-gel hydrothermal [20], Sol-gel combustion [21], microwave solvothermal [22], microwave-hydrothermal [23], etc. Much excellent work has been carried out by soft chemistry, but it usually requires the complicated step of experimental procedures, which need a highly purified, expensive precursor and specific equipment.…”

Section: Introductionmentioning

confidence: 99%

A facile one step conversion of the sub-micrometer to uniform nanopowder in tetragonal BaTiO3 via a surface active etching salt

Charoonsuk

Vittayakorn

2016

Materials & Design

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Continuous BaTi1−yZryO3 (0≤y≤1) nanocrystals synthesis in supercritical fluids for nanostructured lead-free ferroelectric ceramics

Cited by 35 publications

References 49 publications

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

Anticipatory life-cycle assessment of supercritical fluid synthesis of barium strontium titanate nanoparticles

A facile one step conversion of the sub-micrometer to uniform nanopowder in tetragonal BaTiO3 via a surface active etching salt

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