Page 314 - Read Online

Page 8 of 18 Deng et al. Microstructures 2023;3:2023044 https://dx.doi.org/10.20517/microstructures.2023.42

[5]
Figure 7. Linear thermal expansion of antiperovskites (A, B) Mn Cu 1-x Ge N , (C) Mn Ga 0.5 Ge 0.4 Mn 0.1 N 1-x C x [7] , (D)
3
x
3
[8]
[11]
[9]
Mn Cu Si Ge 0.4-x N , (E) Mn Ag N , and (F) Mn Zn Ge N .
0.6
3
x
1-x
3+x
3
1-x
x
The thermal expansion behavior of Mn Ga Ge Mn N C was also reported, and a single-phase ZTE
0.1
x
0.4
1-x
0.5
3
material with a wider temperature range has been obtained . As shown in Figure 7C, the thermal expansion
[7]
behavior of Mn Ga Ge Mn N C changes with the doping of C. When x = 0.1, the compound exhibits
3
0.5
0.4
1-x
x
0.1
low thermal expansion in the temperature range of 190-272 K with |α| < 0.5 × 10 K . In addition, a very
-1
-6
close correlation between N content and NTE behavior was found in Mn Cu Sn N . The N content in the
3
0.5
0.5
1-δ
compound decreases with the increase of the sintering temperature. When the sintering temperature is
950 degrees, the linear expansion coefficient of the compound with the N content of about 0.8 in the
temperature range of 307-355 K with |α| < 0.5 × 10 K .
-1
-6
Huang et al. carried out research on Ge and Si co-doped Mn Cu Si Ge 0.4−x N and obtained a low-
3
0.6
x
[8]
temperature NTE material . As shown in Figure 7D, with the co-doping of Si, the NTE temperature range
of the compound moves to a lower temperature. When x = 0.15, Mn Cu Si Ge N shows NTE behavior
0.25
3
0.6
0.15
in a wide temperature range in the temperature range of 120-184 K, and its linear expansion coefficient is
-1
α = -16 × 10 K . Comparing Mn Cu Si Ge N and Mn Cu Ge N, it can be seen that the single doping of
-6
x
0.6
3
0.4-x
x
1-x
3
Ge has a narrow volume mutation temperature range in the low temperature region (such as Mn Cu Ge N
3
0.8
0.2
around 155 K), while the co-doping of Si can make that the temperature range of the volume change of the
compound is broadened and the behavior of NTE appears. The co-doping method provides a way to
regulate the thermal expansion behavior of single-phase materials.
Lin et al. reported the thermal expansion and magnetic properties of antiperovskite manganese nitrides
[9]
Mn Ag N . The substitution of Mn for Ag effectively broadens the temperature range of NTE and moves
1-x
3+x