Investigation of Structural and Thermal Evolution in Novel Layered Perovskite NdSrMn2O5+δ via Neutron Powder Diffraction and Thermogravimetric Analysis

Autor: Shammya Afroze, Duygu Yilmaz, Md Sumon Reza, Paul F. Henry, Quentin Cheok, Juliana H Zaini, Abul K. Azad, Alibek Issakhov, Milad Sadeghzadeh
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: International Journal of Chemical Engineering, Vol 2020 (2020)
Druh dokumentu: article
ISSN: 1687-806X
1687-8078
DOI: 10.1155/2020/6642187
Popis: Neutron diffraction is one of the best methods for structural analysis of a complex, layered perovskite material with low symmetry by accurately detecting the oxygen positions through octahedral tilting. In this research, the crystal structure of NdSrMn2O5+δ was identified through X-ray diffraction (XRD) and neutron powder diffraction (NPD) at room temperature (RT), which indicated the formation of a layered structure in orthorhombic symmetry in the Pmmm (no. 47) space group. Rietveld refinement of the neutron diffraction data has confirmed the orthorhombic symmetry with unit cell parameters (a = 3.8367 (1) Å, b = 3.8643 (2) Å, and c = 7.7126 (1) Å), atomic positions, and oxygen occupancy. Thermogravimetric analysis revealed the total weight loss of about 0.10% for 20–950°C temperature, which occurred mainly to create oxygen vacancies at high temperatures. Rietveld analyses concurred with the XRD and neutron data allowing correlation of occupancy factors of the oxygen sites.
Databáze: Directory of Open Access Journals
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