Abstract

Negative X-ray expansion in cadmium cyanide

Highlights

  • Heisenbergstr. 1, Stuttgart, 70569, Germany e ISIS Facility, STFC Rutherford Appleton Laboratory, DidcotOxfordshire OX11 0QX, UK † Electronic supplementary information (ESI) available

  • See DOI: 10.1039/ d0mh01989e less well studied in conventional inorganic systems, despite being implicated in a number of interesting phenomena

  • Analogous effects are observed with X-rays; a decrease in intensity of the chargeordering reflection occurs as the sample is irradiated

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Summary

Introduction

Heisenbergstr. 1, Stuttgart, 70569, Germany e ISIS Facility, STFC Rutherford Appleton Laboratory, DidcotOxfordshire OX11 0QX, UK † Electronic supplementary information (ESI) available. X-ray irradiation has been found to induce changes in the resistivity of magnetoresistive manganites (A1Àx3+Bx2+MnO3).[9,10,11] In Pr0.7Ca0.3MnO3 this metal–insulator (and ferromagnetic to antiferromagnetic) transition occurs below 200 K and involves charge ordering of the Mn3+/Mn4+ cations. Analogous effects are observed with X-rays; a decrease in intensity of the chargeordering reflection occurs as the sample is irradiated. Amorphous thin films of BaTiO3—which resist crystallisation on heating above 600 K—are seen to crystallise upon irradiation with high-energy (24 keV) synchrotron radiation.[22] This is rationalised in terms of crystallisation arising

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