Structural Study of [Nd0.5 (Ca0.25Ba0.25) MnO3] and [Nd0.5(Ca0.25Sr0.25)MnO3] Perovskites at Room Temperature | ||||
| Egyptian Journal of Solids | ||||
| Article 4, Volume 24, Issue 1, 2001, Page 33-40 PDF (165 K) | ||||
| DOI: 10.21608/ejs.2001.150491 | ||||
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| Abstract | ||||
| Two perovskite manganite compounds, namely, Nd0.5(Ca0.25Ba0.25)MnO3 and Nd0.5(Ca0.25Sr0.25)MnO3 have been studied by X-ray diffraction (XRD) at room temperature. The perovskite manganite Nd0.5(Ca0.25Ba0.25)MnO3, was found to be orthorhombic with space group Pbnm and the lattice parameters are a = 5.4377 Å, b = 5.4387 Å, and c= 7.7084 Å. The second perovskite Nd0.5(Ca0.25Sr0.25)MnO3 was found to be also orthorhombic with space group < br />Pbnm and the lattice parameters are a = 5.4078 Å, b = 5.4106 Å, and c = 7.6704 Å. The differences in the lattice parameters and unit cell volumes of the two systems are likely lead to influence the transport, structure, and magnetic properties of this type of materials. The difference in the unit cell volumes for the two samples is attributed to the differences in the ionic radii of the substituted divalent alkaline earth ions present in the A-site of the two compounds. | ||||
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