High pressure synthesis of LnCrS{sub 3} (Ln = La, Ce, Nd, Sm) and LaCr{sub 1{minus}x}Fe{sub x}S{sub 3} (x {le} 0.2) with NH{sub 4}CdCl{sub 3} structure type
- Osaka Univ., Ibaraki, Osaka (Japan). Inst. of Scientific and Industrial Research
- Institut des Materiaux de Nantes (France). Lab. de Chimie de Solides
LnCrS{sub 3} (Ln = La, Ce, Nd, Sm) with NH{sub 4}CdCl{sub 3} structure type were prepared in high pressure synthesis at 4 GPa, 1,373 K for 2 h. Their orthorhombic lattice parameters were a = 0.787(2), b = 0.385(1), c = 1.334(3) nm for LaCrS{sub 3}; a = 0.776(4), b = 0.379(2), c = 1.316(7) nm for CeCrS{sub 3}; a = 0.769(2), b = 0.3771(1), c = 1.306(4) nm for NdCrS{sub 3}; and a = 0.764(5), b = 0.374(2), c = 1.297(8) nm for SmCrS{sub 3}. The Ln{sup 3+} ions are coordinated with nine S{sup 2{minus}} ions in CrS{sub 6} double chains. The products are antiferromagnetic semiconductors. The paramagnetic temperature {Theta} varied with a Cr-Cr distance in the CrS{sub 6} double chain. They also showed a weak ferromagnetic behavior at low temperature below 120 K. Magnetic hysteresis was observed for the ferromagnetism between ZFC and FC measurements. LaCr{sub 1{minus}x}Fe{sub x}S{sub 3} solid solution with NH{sub 4}CdCl{sub 3} structure type was also obtained in high pressure synthesis at 4 GPa, 1,473 K for 2 h. The Fe{sup 3+} in high spin state substitutes the Cr{sup 3+} up to about x = 0.2.
- OSTI ID:
- 352422
- Journal Information:
- Materials Research Bulletin, Vol. 34, Issue 2; Other Information: PBD: 15 Jan 1999
- Country of Publication:
- United States
- Language:
- English
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