Perovskite solid solutions La0.75Bi0.25Fe1-xCrxO3: Preparation, structural, and magnetic properties

Ivanov, Sergey A.Uppsala universitet,Fasta tillståndets fysik,Karpov Inst Phys Chem, Dept Inorgan Mat, Moscow 105064, Russia (författare)

Perovskite solid solutions La0.75Bi0.25Fe1-xCrxO3 : Preparation, structural, and magnetic properties

Solid solutions of La0.75Bi0.25Fe1−xCrxO3 (x = 0.1, 0.25, 0.5, and 0.75) prepared by conventional solid state reaction have been studied by means of X-ray powder diffraction (XRPD), neutron powder diffraction (NPD) and magnetic measurements. The NPD and XRPD patterns indicate orthorhombic structure (space group Pnma) for all compositions in the whole temperature range investigated (4–900 K). The lattice parameters of La0.75Bi0.25Fe1−xCrxO3 were found to decrease with the Cr content. It was established that the Fe3+ and Cr3+ cations are randomly positioned at the B-site of the perovskite structure.All samples order antiferromagnetically below transition temperatures that decrease with increasing Cr content, from around 700 K for x = 0.1 to about 300 K for x = 0.75. The antiferromagnetic arrangement of the Fe3+/Cr3+ magnetic moments in the B-site is of G-type along the x-axis (Gx mode) with propagation vector k = (0,0,0) for all concentrations of Cr. Effects of the composition on several structural distortion parameters were investigated and an anomalous variation of the octahedral deformation with Cr content was found. Whilst the overall octahedral deformation varies irregularly with increasing Cr content, the octahedral tilting was found to decrease monotoneously.

Beran, P.CAS, Inst Nucl Phys, Hlavni 130, Rez 25068, Czech Republic. (författare)
Bazuev, G.Russian Acad Sci, Inst Solid State Chem, Ural Branch, Ekaterinburg 620990, Russia. (författare)
Tellgren, Roland,1930-Uppsala universitet,Strukturkemi(Swepub:uu)rolandtg (författare)
Sarkar, TapatiUppsala universitet,Fasta tillståndets fysik(Swepub:uu)tapsa716 (författare)
Nordblad, PerUppsala universitet,Fasta tillståndets fysik(Swepub:uu)pno26208 (författare)
Mathieu, RolandUppsala universitet,Fasta tillståndets fysik(Swepub:uu)rma26208 (författare)
Uppsala universitetFasta tillståndets fysik (creator_code:org_t)

Ingår i:Journal of Solid State Chemistry: Elsevier254, s. 166-1770022-45961095-726X

Av författaren/redakt...: Ivanov, Sergey A ...; Beran, P.; Bazuev, G.; Tellgren, Roland ...; Sarkar, Tapati; Nordblad, Per; visa fler...; Mathieu, Roland; visa färre...

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