Superconductors and Oxide Compounds
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Questions and Answers

What is the name of the compound that became superconducting in 1986?

  • Ln2O3
  • La2-xBaxCuO4 (correct)
  • Ln4+
  • La2-xBaxCuO3

    • Who discovered the superconducting properties of La2-xBaxCuO4?

  • Curies and Fermi
  • Bednorz and Müller (correct)
  • Newton and Galileo
  • Einstein and Bohr

    • What is the year in which the oxide superconductors were discovered?

  • 1988
  • 1986 (correct)
  • 1987
  • 1985

    • What is the reaction that reduces Ln4+ to Ln2O3?

    <p>Reduction with H2.O</p> Signup and view all the answers

    What is the general formula of the compound that became superconducting in 1986?

    <p>La2-xBaxCuO4</p> Signup and view all the answers

    What is the range of coordination numbers observed in Ln3+ complexes?

    <p>3-12</p> Signup and view all the answers

    What is the more common type of coordination number in Ln3+ complexes?

    <p>Higher coordination numbers</p> Signup and view all the answers

    What is the oxidation state of the central metal atom in Ln3+ complexes?

    <p>+3</p> Signup and view all the answers

    What type of metal atom is present in Ln3+ complexes?

    <p>Lanthanide metal</p> Signup and view all the answers

    What is the relationship between coordination number and the central metal atom in Ln3+ complexes?

    <p>The coordination number is directly proportional to the size of the central metal atom</p> Signup and view all the answers

    What is the temperature at which Nb3Ge exhibits zero resistivity?

    <p>30 K</p> Signup and view all the answers

    Which of the following lanthanides is NOT used to prepare divalent oxides through reduction of Ln2O3?

    <p>La</p> Signup and view all the answers

    What is the structural characteristic of the C-type Ln2O3?

    <p>LnO6 units, but not octahedral</p> Signup and view all the answers

    At what temperature range are the divalent oxides prepared through reduction of Ln2O3?

    <p>800-2000 oC</p> Signup and view all the answers

    What is the common method for preparing divalent oxides of Nd, Sm, Eu, and Yb?

    <p>Reduction of Ln2O3 with the elemental lanthanide</p> Signup and view all the answers

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