New Incommensurate Phase in K<SUB>2</SUB>ZnCl<SUB>4</SUB> at Low Temperature

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  • Gesi Kazuo
    Department of Materials Science, College of Science and Engineering, Iwaki Meisei University

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  • New Incommensurate Phase in K2ZnCl4 at Low Temperature
  • New Incommensurate Phase in K2ZnCl4at L

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Abstract

The satellite reflections at (h+0.5, k+0.5, l) in K2ZnCl4 have been measured by neutron diffraction above and below the first-order phase transition at 144.5 K. In the intermediate phase between 144.5 K and 148.0 K, the satellite reflection at (2.5, 1.5, 0) splits into two peaks at (2.5±δ, 1.5, 0). This indicates that the intermediate phase is of an incommensurate structure which is characterized by the modulation wave number vector of q=(0.5±δ)a0*+0.5b0*. The misfit parameter δ is about 0.04, and its temperature variation is slight.

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