Synthesis and structural investigations on multiferroic Ba_1-xSr_xMnO₃ perovskite manganites

Crystallite size effect on lattice strain and crystal structure of Ba1/4Sr3/4MnO3 layered perovskite manganite

“…The polycrystalline Ba 1/4 Sr 3/4 MnO 3 layered perovskites were synthesized via combustion method [10]. In this article, Ba 1/4 Sr 3/4 MnO 3 is denoted by BSMO.…”

“…Very Small impurities peaks of BaO and SrO were detected near 29.7° and 32.3°, respectively, in the XRD patterns of the samples S2-S5 due to insolubility of BaO and SrO. Remaining XRD peaks for all the patterns can be indexed using hexagonal crystal structure with space group P6 3 /mmc [10]. The inset of Figure 1(a) shows selected Bragg reflections (110) between 2θ angle 32.0° and 33.5° for the samples S1and S6.…”

“…In the process of Rietveld refinement, we used Pseudo-Voigt profile function to model the XRD peak profiles, whereas, the background was modelled using six coefficient polynomial. In the hexagonal crystal structure with space group P6 3 /mmc, we considered Ba 2+ (1)/Sr 2+ (1) ions at site 2(a) (0, 0, 0), Ba 2+ (2)/Sr 2+ (2) ions at site 2(c) (1/3, 2/3, 1/4), Mn 4+ ions at sites 4(f) (1/3, 2/3, 1/2+δz), O 2-(1) ions at sites 6(g) (1/2, 0, 0) and O 2-(2) ions at sites 6(h) (δx, -2δx, 1/4) [10]. The Rietveld fit between observed and calculated patterns shows very good fit with agreement parameters R f = 5.28 % and R B = 6.79 % is shown in Figure 2 The refined lattice constant "a" varies from a = 5.5090(2) Å for S1 to a = 5.4957(2) Å for S6 and lattice constant "c" varies from c = 9.1188(3) Å for S1 to c = 9.0950(3) Å for S6.…”

“…There is very little literature available on Ba 1-x Sr x MnO 3 perovskite manganite, so, for this reason, we have chosen this system for investigating structure and properties in nanocrystalline samples [9,11]. The structural unit cell lattice parameters for Ba 1-x Sr x MnO 3 is expected to lie between the lattice parameters of end components BaMnO 3 and SrMnO 3 manganites [10].…”

Synthesis, structural and optical properties of (ALa)(FeMn)O6 (A = Ba and Sr) double perovskites

“…The polycrystalline ALaFeMnO 6 (A = Ba and Sr) double perovskites have been synthesized by autocombustion method [11]. The sample BaLaFeMnO 6 is denoted by BLFMO while sample SrLaFeMnO 6 is denoted by SLFMO in this article.…”