Abstract
In a cation exchange process developed recently for epitaxy ofHgBa2CaCu2O6 (Hg-1212)thin films, TlBa2CaCu2O7 (Tl-1212) or Tl2Ba2CaCu2O9 (Tl-2212) precursor films were employed as the precursor matrices and Hg-1212 wasobtained by replacing Tl cations on the precursor lattice with Hg cations. Thereversibility of the cation exchange dictates directly the underlying mechanism.Following our recent success in demonstrating a complete reversibility within ‘1212’structure, we show the conversion from Hg-1212 to Tl-2212 can be achieved viatwo steps: conversion from Hg-1212 to Tl-1212 followed by Tl intercalation toform double Tl–O plans in each unit cell. The demonstrated reversibility of thecation exchange process has confirmed the process is a thermal perturbation ofweakly bonded cations on the lattice and the direction of the process is determinedby the population ratio between the replacing cations and that to be replaced.
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