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Antolak-Dudka, Anna
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article
Structure and magnetic properties of mechanically alloyed Ni-Ge and Co-Ge alloys
Abstract
<p>Mechanically synthesised Ni and Co-base alloys exhibit interesting magnetic properties, suggesting their potential applications. The equilibrium Ni-Ge and Co-Ge phase diagrams reveal the existance of Ni<sub>5</sub>Ge<sub>3</sub>and Co<sub>5</sub>Ge<sub>3</sub>phases, both exhibiting high and low-temperature modifications. The purpose of this work was to synthesise by mechanical alloying the Ni<sub>5</sub>Ge<sub>3</sub>and Co<sub>5</sub>Ge<sub>3</sub>alloys and to study their structure and magnetic properties. Mechanical alloying processes performed for Ni<sub>62</sub>Ge<sub>38</sub>and Co<sub>62</sub>Ge<sub>38</sub>powder mixtures resulted in the formation of single phase Ni<sub>5</sub>Ge<sub>3</sub>and Co<sub>5</sub>Ge<sub>3</sub>nanocrystalline alloys after 20-50 h of processing. Ni<sub>62</sub>Ge<sub>38</sub>alloy was ferromagnetically ordered for all milling times. In the case of Co-Ge alloy, magnetization measurements showed an evolution from ferromagnetic to paramagnetic ordering upon milling. © 2006 Elsevier B.V. All rights reserved.</p>