BaZnNd2O5: Eine neue struktur bei oxometallaten BaMLn2O5

Müller‐Buschbaum, Hk.; Sonne, P.

doi:10.1016/0022-5088(90)90305-4

Cited by 15 publications

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“…The oxides of the general formula R 2 BaMO 5 (R = rare-earth, M = 3d-transition metal) form a large family of compounds that crystallize into four different structural types with intriguing magnetic properties (Michel and Raveau, 1982;1983 St. Schiffler andMüller-Buschaum, 1986;St. Schiffler and Müller-Buschbaum, 1986;1987a;1987b;Mevs and Müller-Buschbaum, 1989;Mevs and Müller-Buschbaum, 1989;Müller-Buschbaum and Sonne, 1990;Amador et al, 1990;Salinas-Sánchez, Sáez-Puche, and Alario-Franco, 1990;Salinas-Sánchez et al, 1991;Sáez-Puche et al, 1992;Salinas-Sánchez et al, 1992;García-Matres, Martínez, et al, 1993;De Andrés et al, 1993;Sáez-Puche and Hernández-Velasco, 1994;Hernández-Velasco, Salinas-Sánchez, and Sáez-Puche, 1994). Amongst these, the best known is the green phase R 2 BaCuO 5 (R = Sm-Gd, Dy-Lu, Y) compounds exhibiting the orthorhombic structure with space group Pnma where the coordination polyhedron of copper is a distorted tetragonal pyramid CuO 5 which is linked by monocapped trigonal prisms (RO 7 ) by sharing triangular faces.…”

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confidence: 99%

High-pressure synthesis and magnetic properties of tetragonal R2BaCuO5 (R = Sm and Eu)

et al. 2023

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We report the experimental discovery of a new structural phase of well-known orthorhombic R2BaCuO5 (R = Sm and Eu), exhibiting a tetragonal crystal structure with space group P4∕mbm. The high-pressure tetragonal phase is isostructural with the brown phase R2BaCuO5 (R = La, Pr, and Nd). In this structure, the Cu ions form an isolated square planar environment, contrary to the orthorhombic phase, where the Cu ions are located in a distorted square pyramid. Magnetization and specific heat measurements reveal the long-range antiferromagnetic order of the Cu2+ and/or Sm3+ moments for the Sm-sample, with the magnetic specific heat accounting for only 35% of the magnetic entropy. Interestingly, the Eu-sample remains paramagnetic down to the lowest temperature. The high Curie-Weiss temperature of −140 K and magnetic entropy of 3% of the expected value indicates that the system is highly frustrated. We estimated the isothermal entropy change and investigated the magnetocaloric effect for Eu2BaCuO5, and the maximum entropy change detected at a field of 70 kOe at 3 K reaches 5.6 J kg-1K−1.

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