Imperial College London
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Dr Sam Humphry-Baker

Faculty of Engineering, Department of Materials

Lecturer in Ceramics
 
 
 
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Contact

 

s.humphry-baker

 
 
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Location

 

LM.04DRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Humphry-Baker:2016:10.1038/nmat4732,
author = {Humphry-Baker, SA and Garroni, S and Delogu, F and Schuh, CA},
doi = {10.1038/nmat4732},
journal = {Nature Materials},
pages = {1280--1286},
title = {Melt-driven mechanochemical phase transformations in moderately exothermic powder mixtures},
url = {http://dx.doi.org/10.1038/nmat4732},
volume = {15},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Usually, mechanochemical reactions between solid phases are either gradual (by deformation-induced mixing), or self-propagating (by exothermic chemical reaction). Here, by means of a systematic kinetic analysis of the Bi–Te system reacting to Bi2Te3, we establish a third possibility: if one or more of the powder reactants has a low melting point and low thermal effusivity, it is possible that local melting can occur from deformation-induced heating. The presence of hot liquid then triggers chemical mixing locally. The molten events are constrained to individual particles, making them distinct from self-propagating reactions, and occur much faster than conventional gradual reactions. We show that the mechanism is applicable to a broad variety of materials systems, many of which have important functional properties. This mechanistic picture offers a new perspective as compared to conventional, gradual mechanochemical synthesis, where thermal effects are generally ignored.
AU  - Humphry-Baker,SA
AU  - Garroni,S
AU  - Delogu,F
AU  - Schuh,CA
DO  - 10.1038/nmat4732
EP  - 1286
PY  - 2016///
SN  - 1476-1122
SP  - 1280
TI  - Melt-driven mechanochemical phase transformations in moderately exothermic powder mixtures
T2  - Nature Materials
UR  - http://dx.doi.org/10.1038/nmat4732
UR  - http://hdl.handle.net/10044/1/48937
VL  - 15
ER  -
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