2007
DOI: 10.1039/b614168d
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Synthesis and crystal structure of the Sr2Al1.07Mn0.93O5brownmillerite

Abstract: A new brownmillerite-type compound Sr 2 Al 1.07 Mn 0.93 O 5 was synthesized. The crystal structure was determined using electron diffraction and high resolution transmission electron microscopy and refined from X-ray powder diffraction data (space group Imma, a = 5.4358( 1) A ˚, b = 15.6230(4) A ˚, c = 5.6075(1) A ˚, R I = 0.036, R P = 0.023). The structure is characterized by a disordered distribution of the tetrahedral chains in L and R configuration and a partial occupation of the octahedral position by the… Show more

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Cited by 42 publications
(66 citation statements)
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“…Similarly, a good number of brownmillerites show the random distribution of cations between chains and planes. However, recently a number of site-unmixed (Mn,Al) and (Mn,Ga)-based brownmillerites were synthesized, showing the strongest single-ion magnetocrystalline anisotropy axis oriented perpendicular to the planes [8][9][10][11][12][13]. In all these Mn-based brownmillerites containing no other magnetic ions, such as Sr 2 GaMnO 5 [8][9][10][11], Sr 2 Al 1þd Mn 1Àd O 5 [12], Ca 2 AlMnO 5 [8], SrCaGaMnO 5 [13], the Mn 3þ spins were reported to align normally to layers.…”
Section: Introductionmentioning
confidence: 99%
“…Similarly, a good number of brownmillerites show the random distribution of cations between chains and planes. However, recently a number of site-unmixed (Mn,Al) and (Mn,Ga)-based brownmillerites were synthesized, showing the strongest single-ion magnetocrystalline anisotropy axis oriented perpendicular to the planes [8][9][10][11][12][13]. In all these Mn-based brownmillerites containing no other magnetic ions, such as Sr 2 GaMnO 5 [8][9][10][11], Sr 2 Al 1þd Mn 1Àd O 5 [12], Ca 2 AlMnO 5 [8], SrCaGaMnO 5 [13], the Mn 3þ spins were reported to align normally to layers.…”
Section: Introductionmentioning
confidence: 99%
“…34 Hadermann and Abakumov et al further suggested that the distance between the tetrahedral layers (i.e., the length of the b axis) is also an important factor to consider. 35 Parsons et al then recognized that each tetrahedral ordering scheme distorts the octahedra in different ways; the fact that the octahedra are not connected out-of-plane (along b) causes the apical oxygen atoms to displace more than the equatorial ones, which creates a 'shearing' effect from this non-rigid rotation. Generally, the I2bm phase causes the least octahedral (elastic) distortion, followed by P nma, with P bcm causing the most distortion.…”
Section: A Polyhedral Rotation Definitionsmentioning
confidence: 99%
“…These structures can be considered as defect perovskites, with ca 17% of vacancies on the anion positions (Kahlenberg & Shaw, 2001). The oxygen vacancies are distributed in the chains along the [110] directions of the primitive cubic perovskite cell resulting in alternating layers of tetrahedrally and octahedrally coordinated trivalent cations (Hadermann et al, 2007;Abakumov et al, 2005). More complex brownmillerites (A 2 BB'O 5 ) show two different types of B cations, which may occupy the tetrahedrally or the octahedrally coordinated site, respectively.…”
Section: Introductionmentioning
confidence: 99%