Cracks induced by magnetic ordering in the antiperovskiteZnNMn3

Magnetovolume Effect and Negative Thermal Expansion in Mn<SUB>3</SUB>(Cu<SUB>1&minus;<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)N

“…1(a)]. The discontinuous jump in ÁL=L at the transition is estimated to be 3:3 Â 10 À3 for x ¼ 0:15, which is comparable to those of Mn 3 ZnN (4:6 Â 10 À3 ) 11,15) and Mn 3 GaN (3:8 Â 10 À3 ), 9,13) and one of the largest among Mn 3 AX (X ¼ N, C) members. At the same compositional region, the cubic structure is recovered.…”

“…We obtained Mn 3 AN by solid state reaction. 14,15,17) Powders of Mn 2 N and pure element A (purity: 99.9% or higher) were mixed in a bag filled with nitrogen gas and then sealed in a quartz tube under vacuum (<10 À1 Pa). The sealed quartz tube was heated at 760 C for 40-70 h. To obtain a solid solution Mn 3 (A 1Àx B x )N, we mixed Mn 3 AN and Mn 3 BN in an appropriate molar ratio, pressed into a pellet, and sealed it in a quartz tube under vacuum.…”

“…6,7) Antiperovskite manganese nitrides Mn 3 AN (A ¼ Zn, Ga, etc) are well-known for their large MVE. [8][9][10][11][12][13][14][15] For these nitrides the large volume expansion is triggered by the magnetic transition from the high-temperature (high-T) paramagnetic phase to the low-T antiferromagnetic (AF) ordered phase with the triangular À 5g structure. This expansion is isotropic because the crystal structure remains cubic at the transition.…”

Magnetic transitions and magnetocaloric effects in Fe0.75Mn1.35As

“…Consequently, the conclusion can be safely drawn that the partly irreversible lattice expansion (induced by a magnetic field or temperature) is not large enough, which cannot influence the magnetic transitions in the present compound. A similar irreversible lattice expansion was observed in the antiperovskite ZnNMn 3 [21], and in spite of the irreversible lattice expansion, a clear AF transition could still be seen after several thermo-cycles. From Fig.…”

Structural, magnetic and transport properties of Mn3.1Sn0.9 and Mn3.1Sn0.9N compounds

“…manganese atoms occupy the face center sites while M atoms at the corners, and nitrogen atoms in the body center sites. This family of nitrides is well known for the large magnetovolume effects (MVE) [13][14][15][16][17], as well as a possible large piezo-magnetic effect [18]. Moreover, Mn 3 SnN has the highest Néel temperature, i.e.…”