𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Evidence of interstitial oxygen in room temperature oxidized La2−xSrxCuO4 + y (0 < x < 0.1)

✍ Scribed by C. Rial; U. Amador; E. Morán; M.A. Alario-Franco; N.H. Andersen

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
890 KB
Volume
234
Category
Article
ISSN
0921-4534

No coin nor oath required. For personal study only.

✦ Synopsis

The crystal structure, superconducting properties and oxygen stoichiometry of room temperature chemically oxidized La2_~grxCuO4+y (x= 0.05, 0.09) have been studied by means of powder neutron diffraction, magnetic susceptibility and thermogravimetric analysis. The presence in these materials of interstitial oxygen located at (~, y, ~; y ~ ~ ), as previously observed in oxygen-rich La2CuO4+, is proposed from neutron diffraction data at different temperatures. This is supported by the excess of mass loss detected by TG for the oxidized materials relative to the starting ones. Besides, an important improvement in the superconducting properties ( Tc and superconducting volume fraction) of these compounds is observed after oxidation. On the other hand, no phase separation into two phases with different oxygen content is observed at low temperature.

📜 SIMILAR VOLUMES

Polaronic Conduction in La2−xSrxCoO4(0.2
Polaronic Conduction in La2−xSrxCoO4(0.25≤x≤1.10) below Room Temperature
✍ E. Iguchi; H. Nakatsugawa; K. Futakuchi 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 332 KB

Electrical transports in the La2؊xSrxCoO4 system (0.254 x4 1.10) below room temperature were investigated by bulk conductivities and dielectric properties in polycrystalline specimens. The bulk conductivities were obtained by complex-plane impedance analyses. For x41.00, every specimen contains a di

Correlations in the low temperature spec
Correlations in the low temperature specific heat across the superconducting regime of La2-xSrxCuO4 (0.05 ≤ x ≤ 0.27)
✍ N.E. Hussey; D.F. Brewer; T.E. Hargreaves; C.S. McMenamin; A.L. Thomson; L.Z. Ca 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 151 KB

We present measuxements of the low temperature specific heat (0.09K< T < 1.5K) of seven samples of the La2\_~Sr~CuO4 system (0.05< z <0.27). All the data were found to fit the expression, C = A(x)T -2 +a(x)T'~(~)+ fl(z)T 3. The coefficient of the nuclear specific heat contribution A(z) was found to

Oxygen nonstoichiometry in copper-oxide
Oxygen nonstoichiometry in copper-oxide based superconductors and related systems: Structure of nonsuperconducting Bi2Sr3−xYxCu2O8+y (x≈0.6–1.0)
✍ C.C. Torardi; J.B. Parise; M.A. Subramanian; J. Gopalakrishnan; A.W. Sleight 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 632 KB

Structural refinements of the new compounds Bi2Sr3\_ xYxCu208 + y in the range of x that gives insulating rather than superconducting behaviour (x~ 0.6 and 1.0) have been obtained from single crystal X-ray and neutron powder diffraction data. Results indicate oxygen nonstoichiometry and suggest cond