Crystal structure and thermal expansion of LaCr1−xMgxO3, 0 < x ≤ 0.25

► Homogeneity range for LaCr1−xMgxO3 with orthorhombic perovskite structure is х ≤ 0.25. ► First order OR phase transition occurs at 260-311 °C for LaCr1−xMgxO3, 0≤ x ≤0.25. ► TEC for high-temperature rhombohedral phase increases with magnesium content.