Multiparticle reaction function of ball-milled MgH2 powders

Research output: Contribution to journalArticle

Abstract

The kinetics of hydride formation and decomposition described by semi-empirical models generally does not involve particle and grain-size dependence. Involving grain size distribution, a multiparticle reaction function has been introduced for a nanocrystalline powder agglomerate and has been applied for surface controlled, contracting volume and Johnson-Mehl-Avrami (JMA) type of sorption processes. Taking into account the microstructural parameters describing the grain size distribution of nanocrystalline MgH2 powders obtained after repeated hydriding/dehydriding cycles, the type of reaction and the corresponding reaction constants were determined after each full cycle. The multiparticle reaction functions of the three different sorption processes follow the classical functions only if the grain size distribution is very sharp, however, a strong deviation takes place when the distribution is wider, i.e., the microstructure is less homogeneous.

Original languageEnglish
Article number076511
JournalJapanese Journal of Applied Physics
Volume48
Issue number7 PART 1
DOIs
Publication statusPublished - Jul 2009

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Nanocrystalline powders
balls
grain size
Powders
Sorption
sorption
Hydrides
cycles
Rate constants
hydrides
Decomposition
Microstructure
Kinetics
deviation
decomposition
microstructure
kinetics

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Multiparticle reaction function of ball-milled MgH2 powders. / Révész, A.

In: Japanese Journal of Applied Physics, Vol. 48, No. 7 PART 1, 076511, 07.2009.

Research output: Contribution to journalArticle

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