| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1651851 | Materials Letters | 2008 | 4 Pages |
Bulk materials with the general formula of Mn3(Cu0.6NbxGe0.4 − x)N (x = 0.05, 0.1, 0.15, 0.2, 0.25), Mn3(Cu0.6Ge0.4)N and Mn3(Cu0.7Ge0.3)N were fabricated by mechanical ball milling and solid state sintering. Their thermal expansion coefficients and electrical conductivities were investigated in the temperature range of 80–300 K. It is found that the temperature interval of negative temperature expansion behavior is about 95 K in the samples of Mn3(Cu0.6Nb0.15Ge0.25)N and Mn3(Cu0.6 Nb0.2Ge0.2)N, which is twice as large as that of Mn3(Cu0.7Ge0.3)N. The negative thermal expansion of Mn3(Cu0.6Nb0.15Ge0.25)N can reach to − 19.5 × 10−6 K− 1 in the temperature range of 165 to 210 K. The electrical conductivity of this series materials is in a level of about 2.5 × 106 (Ω m)− 1.
