H Abe1,
H Saitoh2, T Ueno2, H Nakao3, Y Matsuo4,
K Ohshima2 and H Matsumoto1
1Department of Materials Science and Engineering, National Defense Academy,
1-10-20 Hashirimizu, Yokosuka 239-8686, Japan
2Institute of Materials Science, University of Tsukuba, 1-1-1 Tennoudai,
Tsukuba 305-8573, Japan
3Department of Physics, Tohoku University, Sendai 980-8578, Japan
4Department of Physics, Nara Women's University,
Kitauoya-Higasi, Nara 630-8506, Japan
J. Phys.: Condens. Matter 15, 1665 (2003).
Abstract
Non-uniform distortion induced by superstructure domains appears during
the ordering process of an order-disorder transformation in a single decagonal
quasicrystal of Al72Ni20Co8. The full width at half maximum (FWHM) of the fundamental reflections increased below the transformation temperature, Tc. At the same time, the integrated intensity of the fundamental reflections varied drastically at Tc. A small hysteresis was also observed in the temperature dependences of
both FWHM and the integrated intensity of the fundamental reflections.
Peak broadening of the fundamental reflections is predominantly dependent
on |G||| below Tc. In addition, the weak dependence of the peak broadening with |G⊥| is extracted from the observed FWHM of the fundamental reflections. After
deconvolution, FWHM of the fundamental reflections appears to be a linear
combination of |G||| and |G⊥|. Coexistence of the non-uniform distortion and of the random phason strain contributes to the ordering process below Tc. The diffuse scattering from atomic short-range order (SRO) was distributed
around the ideal positions of the superstructure reflections. The SRO diffuse
scattering disappeared completely above Tc+ 10 K. Also, a small hysteresis of the SRO diffuse scattering was found
in the temperature cycle.
 |
Figure 1
Temperature dependences of (a) FWHM and (b) the
integrated intensity for12540 the radial scan of the
fundamental reflection.
|
 |
Figure 2
|G|| | |dependences
of FWHM of the fundamental reflections at 300 K (quenched above Tc), 965 K
(T<Tc) and 1096 K (T>Tc). Apparent peak broadening with increasing
the | | values at 965 K is observed.<
/p>
|
 |
Figure 3
(a) Peak broadening as a function of |G|| | at 965
K (T<Tc). The solid line in Fig. 3(a) shows the lower limit
of the observed FWHM of the fundamental reflections.
(b) The deconvoluted FWHM as a function of |G⊥ |.
The solid line is a linear fit on |G⊥ | using the deconvoluted
data.
(c) The deconvoluted FWHM as a function of |G|| |. A solid
line, which is the same one in Fig. 3(a), is the lower limit of the
observed FWHM of the fundamental reflections.
|
 |
Figure 4
The reciprocal maps showing the SRO diffuse scattering around the
fundamental reflection at (a) room temperature (quenched above Tc), (b)
965 K (T<Tc) and (c) 1116 K(T>Tc). White crosses
are the ideal S1-superstructure positions. The diffuse intensity profile
of the diffuse peak labeled P was measured during the temperature cycle
in Fig. 5. The diffuse scattering around the S1-superstructure positions
disappeared completely above Tc + 10 K. |
 |
Figure 5
Temperature dependences of (a) the diffuse
intensity and (b) FWHM of the diffuse peak along line P in Fig. 4. The
dotted line is a guideline for the reader’s eye. A little hysteresis was
shown in the temperature cycle.
|
 |
Figure 6
(a) Temperature dependence of FWHM of the 12540 fundamental reflection.
The solid line represents a fit to the function (see text).
(b) The deconvoluted FWHM in the S1-superstructure
reflection (21520) decreases with decreasing
temperature.
|
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Department of Materials Science and Engineering
National Defense Academy
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