Abstract
Orthorhombic LaFeO 3, with spontaneous lattice strain ( b - a)/( b + a) = 2.38 × 10 −4, is shown by X-ray methods to be ferroelastic. The highly twinned as-grown crystals are detwinned by applying a compressive stress of about 2 MNm −2 along a combined a, b direction. The [010] direction in a single crystal is reproducibly transformable into the [100] direction under uniaxial stress. The resulting ferroelastic transformation is caused by atomic displacements of 0.23 Å for La, 0.48 Å for O I and 0.79 A for O II, the Fe atom remaining invariant at an inversion center. Coupling is expected between the ferroelasticity and the dominant antiferromagnetic spin orientation, but not with the weak ferromagnetism.
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