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[sdpd] Help for microabsorption coefficient

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      <p>Hi,everyone,<br>
I wonder whether someone has refined these data of Round Robin QPA of IUCrCPD. Sample 4 presented a microabsorption problem. I try to refine this sample by the Brindley method. The Brindley coefficients, which I have gotten in terms of the grain size (28.0 um for corundum, 36.2 um<br>
for magnetite and 21.1 um for zircon), are  1.362, 0.587, 1.108 respectively for corundum, magnetite and zircon, and the ATZ (Coefficient to calculate the weight percentage of the phase.) values are respectively 449.1615, 3155.821 and 661.7455 for them. I'm not sure whether these coefficients (Values of tau as a function of the product (mj-mu)R) are right  and I just got them by the table tabulated by Brindley.<br>
I'm very appreciated if you have refined this data and post the corresponding optimized structure parameters. Thanks very much!!<br>
sincerely, daxu<br>
<br>
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