The crystal and magnetic structure of Ti-substituted LaCrO{sub 3}

Graphical abstract: Rietveld refinement plot of La(Cr{sub 0.90}Ti{sub 0.10})O{sub 3}; the inset shows the antiferromagnetic G{sub x}-type structure occurring at the Cr sub-lattice. Research highlights: {yields} Magnetic structure of Ti-substituted LaCrO{sub 3}. {yields} Spins on the Cr-site order according to an antiferromagnetic G{sub x}-type ordering. {yields} Limited solid state solubility of Ti{sup 4+} in LaCrO{sub 3} and mixed valence at Cr site. -- Abstract: The crystal and magnetic structures of LaCrO{sub 3} and La(Cr{sub 0.90}Ti{sub 0.10})O{sub 3} have been investigated between 5 and 350 K by means of neutron powder diffraction and DC magnetic measurements. Both compounds are characterized by an antiferromagnetic G{sub x}-type ordering at low temperature. Structural features suggest the occurrence of Ti in the tetra-valent state. Despite the mixed valence induced by Ti-substitution leading to the occurrence of the Jahn-Teller species Cr{sup 2+}, no evidence for long range ferromagnetism can be detected. On account of a miscibility gap, a higher degree of Ti-substitution at the Cr site cannot be achieved; as a consequence the solid state solubility of Ti in LaCrO{sub 3} at 1573 K has been ascertained.