The tunable Tc region of MnSb alloy (44 - 49 % at. Sb) was analyzed using OM, VSM, DSC, XRD, EDS and XRF characterization techniques. Thermal and magnetic analysis suggests the existence of a non reported irreversible reaction on heating, compatible to a reverse peritectoid transition MnxSb ➔ Mn2Sb + Mnx'Sb.
Keywords:
Magnetic materials; phase transformation; MnSb metals and alloys; manganese-antimony alloys; Curie Temperature; perictetoid transformation
| Range (%atSb) | Range Tc (°C) | Peritectic | Eutectic | Temperature evaluation (°C) | |
|---|---|---|---|---|---|
| Williams | 40.0-50.0 | ? - 328 | 853 | 573 | 100-1240 |
| Teramoto | 46.0-49.7 | 117-319 | ? | ? | 400-900 |
| Okamoto | 45.0-49.0 | 90 - 314 | 840 | 570 | 0-940 |
| Chen | 45.5-50.0 | ? | 843 | 574 | 500-915 |
| Vanyarkho | 45.5-49.0 | ? | 841 | 568 | 400-920 |
| Kainzbauer | 45.5-50.5 | ? | 830 | 566 | 300-940 |
| Sample | Weighed (%atSb) | XRF (%atSb) | EDS - MnSb (%atSb) | Tc (°C) | MnxSb x = |
|---|---|---|---|---|---|
| Rec_1 | 43.1% | 40.1% | 48.9% | 140.35 | - |
| Rec_4 | 46.1% | 48.1% | 49.7% | 102.06 | 1.013 |
| Rec_2 | 44.1% | 44.5% | 50.5% | 143.00 | 0.980 |
| Rec_3 | 45.0% | 47.1% | 50.6% | 177.22 | 0.977 |
| Rec_5 | 47.1% | 48.3% | 51.2% | 217.85 | 0.952 |
| Rec_6 | 48.1% | 48.7% | 52.2% | 246.04 | 0.915 |
| Rec_7 | 49.1% | 49.3% | 53.1% | 316.11 | 0.883 |
| Rec_8 | 50.0% | 52.8% | 54.1% | 316.90 | - |
| Cell's net parameters | |||||||
|---|---|---|---|---|---|---|---|
| Fase | Parameter | Rec_8 | TT_8 | Rec_3 | TT_3 | Rec_2 | TT_2 |
| MnxSb (P6) | a (Å) | 4.130 | 4.191 | 4.190 | 4.201 | 4.200 | 4.214 |
| c (Å) | 5.790 | 5.731 | 5.734 | 5.728 | 5.724 | 5.716 | |
| Volume | 85.546 | 87.163 | 87.181 | 87.534 | 87.433 | 87.880 | |
| R-Bragg | 4.331 | 3.036 | 4.379 | 3.997 | 3.324 | 3.242 | |
| X | 1.00 | 1.00 | 1.09 | 1.00 | 1.22 | 1.09 | |
| Mn2Sb (P4) | a (Å) | 4.056 | 4.078 | 4.075 | 4.077 | ||
| c (Å) | 6.110 | 6.546 | 6.543 | 6.546 | |||
| Volume | 100.536 | 108.846 | 108.655 | 108.777 | |||
| R-Bragg | 1.584 | 1.770 | 2.519 | 2.620 | |||
| Sb (R3) | a (Å) | 4.309 | 4.307 | ||||
| c (Å) | 5.635 | 5.633 | |||||
| Volume | 90.595 | 90.509 | |||||
| R-Bragg | 1.399 | 2.350 | |||||
| GOF | 1.83 | 1.88 | 1.68 | 1.89 | 1.49 | 1.45 | |
| RWP | 8.74 | 7.68 | 14.71 | 7.42 | 12.24 | 5.67 | |
