Author： Wilhelm H. Cros C. Arrouy F. demazeau G.
Publisher： Academic Press
ISSN： 0022-4596
Source： Journal of Solid State Chemistry, Vol.126, Iss.1, 1996-10, pp. : 88-94
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Abstract
A pressure induced transition from the T' to the T/O structure has been observed in the La 2- x Nd x CuO 4 solid-solution for x = 0.6, 0.7, 1.2, and 1.5 with energy dispersive X-ray diffraction. Indications have been found that such a transition may even occur in the x = 2.0 composition at pressure higher than 18 GPa. In all cases the observed transitions were reversible. The transition pressure has been related to the compressive stress in the Ln-O II linkages in the fluorite-like Ln O 2 layers of the T' structure. The pressure dependence of the tolerance factor t is deduced and discussed. A strong electrostatic repulsion between oxygen ions in the 4 d site is probably responsible for the increase of the T' structure's bulk modulus with Nd content x .
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