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- W4248047862 abstract "Hydrogen induces an orthorhombic-to-tetragonal transformation in superconducting ceramics of the type RBa2Cu3O7. We have studied this transformation by measuring the thermal expansion coefficients of the system EuBa2Cu3O7Hx between liquid nitrogen and room temperature by X-ray diffractometry. For the hydrogen-free orthorhombic compound, the relative thermal expansion is approximately 50% stronger along b and c than along the a axis. Upon the addition of hydrogen, all thermal expansion coefficients decrease, with a strong drop near x = 0.5 (e.g. by more than a factor of four for a−1ΔaΔT. The lattice parameters increase with x, with in general 1aΔaΔx >1bΔbΔx >1cΔcΔx up to x ≈ 0.5, from whereon one observes coexistence of an orthorhombic and tetragonal phase, the former vanishing for x > 1. The results seem to indicate that the hydrogen atoms occupy the empty oxygen sites in the Cu(1) basal plane, together perhaps with sites in the europium planes." @default.
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- W4248047862 date "1991-01-01" @default.
- W4248047862 modified "2023-09-25" @default.
- W4248047862 title "Static and dynamic dilation of the high-Tc superconductor EuBa2Cu3O7−δHx" @default.
- W4248047862 doi "https://doi.org/10.1016/s0022-5088(06)80278-x" @default.
- W4248047862 hasPublicationYear "1991" @default.
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