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Metal-insulator transitions strongly coupled with lattice were found inBi1-xLaxNiO3. Synchrotron X-ray powder diffraction revealed that pressure (P ~3 GPa, T = 300 K), temperature (T ~ 340 K, x = 0.05), and La-substitution (x ~0.075, T = 300 K) caused the similar structural change from a triclinic(insulating) to an orthorhombic (metallic) symmetry, suggesting melting of theA-site charge disproportionation. Comparing crystal structure and physicalproperties with the other ANiO3 series, an electronic state of the metallicphase can be described as [A3+Ld, Ni2+L1-d], where a ligand-hole L contributesto a conductivity. We depicted a schematic P-T phase diagram of BiNiO3including a critical point (3 GPa, 300 K) and an inhomogeneous region, whichimplies universality of ligand-hole dynamics in ANiO3 (A = Bi, Pr, Nd,...).Comment: 24 pages, 8 figures, Phys. Rev. B in pres

physical review. b, condensed matter and materials physics

Pressure/temperature/substitution-induced melting of<i>A</i>-site charge disproportionation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>La</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>NiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="…

Pressure/temperature/substitution-induced melting ofA-site charge disproportionation inBi1−xLaxNiO3