首页|Magnetic and magnetocaloric properties in GdFeTiO5 and GdMnTeO6
Magnetic and magnetocaloric properties in GdFeTiO5 and GdMnTeO6
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NSTL
Elsevier
We report the magnetic and magnetocaloric properties of two Gd-based compounds. First, for the orthorhombic lattice compound GdFeTiO5, no signature of long-range magnetic ordering is observed down to 2 K. The maximum magnetic entropy change (-delta S-M(max)) is derived to be 18.9 J kg(-1)K(-1) at 3 K for 0-3 T and 33.6 J kg(-1) K(-1)at 5 K for 0-7 T, respectively, which is attributed to the rotation of spins of weakly ferromagnetically coupled Gd3+/Fe(3+ )ions toward the external magnetic field. Second, a new honeycomb layered tellurate GdMnTeO(6 )is synthesized. The compound crystallizes in a trigonal structure with space group P-31c and is long-range antiferromagnetically ordered at TN = 7.0 K. The value of -delta S-M(max) at TN is about 14.8 J kg(-1) K-1 for 0-3 T and 29.8 J kg(-1) K-1 for 0-7 T, respectively, which is associated with field-induced antiferromagnetic to ferromagnetic transition. Thus, with the large value of -delta S-M(max) and the absence of thermal and field hysteresis, both Gd compounds are candidates for low-temperature magnetocaloric materials. In relative to GdFeTiO5, the reduction of MCE in GdMnTeO6 might be associated with antiferromagnetic order.
NSTL
Elsevier
