The origin of the structural transition in double-perovskite manganite PrBaMn2O6

The pressure-induced bandgap evolution of double perovskite Cs2AgBiBr6 nanocrystals is highly related to the orbital interactions, associated with the tilting and distortion of [AgBr6]5− and [BiBr6]3− octahedra under pressure.

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Structural and magnetic properties with reversible magnetocaloric effect in PrSr1–xPbxMn2O6 (0.1 ≤ x ≤ 0.3) double perovskite manganite structures

The Philosophical Magazine A Journal of Theoretical Experimental and Applied Physics ◽

10.1080/14786435.2018.1503424 ◽

2018 ◽

Vol 98 (30) ◽

pp. 2782-2796 ◽

Cited By ~ 3

Author(s):

Ali Osman Ayaş

Keyword(s):

Magnetic Properties ◽

Magnetocaloric Effect ◽

Double Perovskite ◽

Perovskite Manganite ◽

Structural And Magnetic Properties

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Observation of Room-Temperature Range Magnetocaloric Effect in PrSr1−xPbxMn2O6 (0.4 ≤ x ≤ 0.6) Double-Perovskite Manganite System

Journal of Superconductivity and Novel Magnetism ◽

10.1007/s10948-018-4688-6 ◽

2018 ◽

Vol 32 (2) ◽

pp. 393-403

Author(s):

Ali Osman Ayaş

Keyword(s):

Magnetocaloric Effect ◽

Room Temperature ◽

Double Perovskite ◽

Perovskite Manganite ◽

Temperature Range

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Role of the Tilting of Oxygen Octahedra in the Stabilization of the Orbital-Modulated State in the Layered Perovskite Manganite Ca2-xNdxMnO4

Materials Science Forum ◽

10.4028/www.scientific.net/msf.783-786.2065 ◽

2014 ◽

Vol 783-786 ◽

pp. 2065-2070

Author(s):

Yasuhide Inoue ◽

Masazumi Arao ◽

Ippei Tanaka ◽

Yasumasa Koyama

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Room Temperature ◽

Structural Transition ◽

Oxygen Octahedra ◽

Layered Perovskite ◽

Perovskite Manganite ◽

Transmission Electron ◽

The Stability

There exists the orbital-modulated (OM) state in the layered manganite Ca2-xNdxMnO4(CNMO) with 0.20 ≤x≤ 0.50. To understand the effect of the tilting of MnO6octahedra to the stability of the OM state, the crystallographic features of CNMO samples prepared by a solid-state reaction have been investigated mainly by transmission electron microscopy. For 0.30 ≤x≤ 0.50, it was found that the (LTO → Pccn/LTT) structural transition occurred on cooling from room temperature, where the LTO and Pccn/LTT structures are, respectively, characterized by tilting displacements of oxygen octahedra about one and two of the <110> directions. The notable feature of the (LTO → Pccn/LTT) transition is that its progress strongly suppresses the growth of the OM state for 0.30 ≤x≤ 0.45. As a result of the suppression, the OM state exhibits a re-entrant behavior for its appearance. This is an indication that the Pccn/LTT tilting is not favorable for the stabilization of the OM state.

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Structural Transition and Magnetic Properties of (Sr2-3xLa2xBax)FeMoO6

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.1036 ◽

2010 ◽

Vol 663-665 ◽

pp. 1036-1040

Author(s):

Zhen Feng Xu ◽

Jun Liang ◽

Juan Pei ◽

Yan Yan Yin ◽

Chang Li

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Structural Transition ◽

Double Perovskite ◽

Perovskite Oxides ◽

Cubic Phase ◽

X Ray ◽

Lattice Constants ◽

Average Size ◽

A Site

Ordered double perovskite oxides (Sr2-3xLa2xBax)FeMoO6 (0≤x≤0.3) have been investigated in this work. X-ray powder diffraction reveals that the crystal structure of the compounds changes from a tetragonal I4/m lattice to a cubic Fm 3m lattice around x=0.2. Though the nominal average size of the A site cation of (Sr2-3xLa2xBax)FeMoO6 is designed to be almost independent of x, the refinements of the crystal structure show that the lattice constants increase with x in both the tetragonal and the cubic phase regions due to electron doping. As the x increases, the degree of cationic ordering on the B site is decreased pronouncedly, while the Curie temperature of the compounds is nearly unchanged.

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