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Competing tetragonal and monoclinic phases in
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10.1063/1.3190527
/content/aip/journal/jap/106/3/10.1063/1.3190527
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/3/10.1063/1.3190527

Figures

Image of FIG. 1.
FIG. 1.

Evolution of x-ray powder diffraction pattern of as a function of temperature. The left column (bottom to top) depicts the evolution on heating, while the right column (top to bottom) depicts the evolution on cooling. The insets are magnified plots of the corresponding pattern. The Miller indices of the tetragonal and cubic phases are shown in the bottom panel of the left column and the top panel of the right column, respectively. The arrow in the 348 K pattern indicates the appearance of the 220 cubic peak.

Image of FIG. 2.
FIG. 2.

Williamson–Hall analysis of the XRD pattern of the powder of at room temperature.

Image of FIG. 3.
FIG. 3.

Evolution of the FWHM of prominent cubic reflections with time at 783 K.

Image of FIG. 4.
FIG. 4.

Williamson–Hall analysis of half widths of the Bragg peaks in the cubic phase at the start and end (after 84 min) of annealing at 783 K. The analysis suggests the presence of anisotropic peak broadening.

Image of FIG. 5.
FIG. 5.

Time evolution of the strain parameter extracted from the Williamson–Hall analysis of the two sets of data, as shown in Fig. 4.

Image of FIG. 6.
FIG. 6.

Variation in the peak intensity of strongest reflection of the monoclinic martensite phase on heating and cooling. This experiment corresponds to the second thermal cycling.

Image of FIG. 7.
FIG. 7.

DSC in two heating-cooling runs. The transition temperatures are indicated by tick marks. The arrows show the heating and cooling directions, while 1 and 2 represent the first and second cycles, respectively.

Image of FIG. 8.
FIG. 8.

Part of the XRD patterns of : (a) unannealed sliced ingot at 300 K, (b) annealed sliced ingot at 300 K, (c) annealed powder at 300 K, (d) unannealed powder, and (e) unannealed powder at 393 K while heating. The labels T, C and M denote peaks corresponding to the tetragonal, cubic and monoclinic phases, respectively.

Image of FIG. 9.
FIG. 9.

Temperature variation in the weak field ac susceptibility of bulk .

Image of FIG. 10.
FIG. 10.

Evolution of x-ray powder diffraction pattern of as a function of temperature. The left column (bottom to top) depicts the evolution on heating, while the right column (top to bottom) depicts the evolution on cooling. The indices of the peaks corresponding to the tetragonal and the cubic phases have been shown.

Image of FIG. 11.
FIG. 11.

Williamson–Hall analysis of the XRD pattern of the powder of at room temperature.

Image of FIG. 12.
FIG. 12.

Temperature variation in (a) lattice parameters of the cubic and tetragonal phases of on heating (filled red circles) and cooling (black cross), (b) unit cell volume while heating, and (c) molar fraction of the tetragonal phase on heating (filled red circles) and cooling (filled black circles). In (a), the -parameter of the tetragonal phase is multiplied by for direct comparison with the -axis of the tetragonal cell and the cubic lattice parameter . Similarly the cell volume of the tetragonal phase is multiplied by 2 for direct comparison with the cubic cell volume. The straight solid lines in (b) are least-squares fitted lines in the tetragonal (tet) and cubic (cub) phases.

Tables

Generic image for table
Table I.

Comparison of the FWHM of some of the prominent Bragg reflections of and 0.35. The instrumental FWHM in this angular range is and has not been subtracted.

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/content/aip/journal/jap/106/3/10.1063/1.3190527
2009-08-07
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Competing tetragonal and monoclinic phases in Ni2.2Mn0.80Ga
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/3/10.1063/1.3190527
10.1063/1.3190527
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