The size effect on the lattice parameter of ionic KCl nanocrystals was studied systematically during mechanical milling of pure KCl powder under vacuum. The results suggest anomalous lattice expansion, with the lattice parameter increasing from 6.278 Å at d = 6 μm to 6.30307 Å at d = 85 nm. The defects generated during ball milling of KCl and surface stress are deemed to be responsible for this lattice parameter expansion. © 2009 Acta Materialia Inc.

Prithu C. Sharma

Lattice expansion

Lattice parameter

Lattice parameters

Madelung energy

MECHANICAL MILLING

size effects

Surface stress

Ball milling

Lattice constants

Mechanical Alloying

Raman spectroscopy

Surface defects

Milling (machining)

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Scripta Materialia

SnF 2 of various crystallite sizes have been obtained by mechanical milling. Further, the crystallite size dependent conduction characteristics of SnF 2 have been investigated by X-Ray Diffraction, High Resolution Scanning Electron Microscopy and Impedance Spectroscopy techniques. The crystallite size and microstrain developed during the milling process have been calculated by using Scherrer's semi-empirical formula. Further, an attempt is made to correlate the conductivity results of mechanically milled samples with the crystallite size and microstrain. In all cases, the temperature dependent conductivity plot obeys the Arrhenius behavior. The enhancement in conductivity of SnF 2 is found to be of two orders of magnitude after simply milling for 10 h. © 2012 Elsevier B.V. All rights reserved.

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Solid State Communications

‘Madelung model’ prediction for dependence of lattice parameter on nanocrystal size

Size effect on the lattice parameter of KCl during mechanical milling

Journal	Scripta Materialia
ISSN	13596462
Open Access	No