Using synchrotron energy-dispersive x-ray pcwder diffraction (EDXRPD) we have shown that K,SnBr, transforms at pressuresot 14 kbar and above from the parent monoclinic cell to a cubic structure of symmetry Fm3m. which is stable to 120 kbar. A different phase appean toexist above 120 kbar.
Many diamonds used as anvils in diamond anvil cells fail at the base due to a concentration of tensile stress in this region. We have calculated the maximum principal tensile stresses in the lower half of the anvil and in the support for simulated anvil plus support finite element meshes. The Young's modulus E and Poisson's ratio 1 6 for both components were varied systematically. Geometrical parameters determining the shape of the light port in the support and the shape of the anvil were also varied. E , small v and the support has similar E and large v. The effect of geometry in minimizing or enhancing basal tenslon Is profound. There is a well defined tension minimum for a conical light port of semi-angle 2530'.Simulations were also calculated for a diamond on a flat B,C plate. Such supports often fail at low pressure (around 3.5 GPa). The tension in the support decreased rapidly for a small increase In plate thickness.
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