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Publication Citation: Bulk-Moduli Systematics in Oxides, Including Superconductors

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Author(s): H M. Ledbetter; Sudook A. Kim;
Title: Bulk-Moduli Systematics in Oxides, Including Superconductors
Published: January 01, 2001
Abstract: For oxides, including superconductors, we consider the systematics fo the bulk-modulus/atomic-volume (B/Vα) relationship. For nonsuperconducting oxides, the B-Vα diagram shows that most oxides fall in three sets: (1) rocksalt crystal structure, AO; (2) perovskite crystal structure, ACOd3^; (3) transition-metal oxides ranging through stoichiometries of AO, A3O4. A2O. Seventeen oxide superconductors show a surprisingly narrow Va range and a relatively narrow range of B = 116 19 Gpa. B-Va slopes depart from expectations from a simple ionic-crystal model. Within a superconductor subgroup, for example, La-O or T1-O. higher B corresponds to higher Tc. Because the in-plane (CuO2-plane) compressibility probably varies little among these cuprates, the out-of-plane compressibility should correlate inversely with Tc.
Citation: Bulk-Moduli Systematics in Oxides, Including Superconductors
Publisher: Handbook of Elastic Properties of Solids, Fluids, and Gases ,
Volume: II
Pages: pp. 249 - 253
Keywords: bulk modulus;elastic constants;oxide superconductors;oxides;superconductors;superending critical temperature
Research Areas: Materials Science
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