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<p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif">Dear friends and colleagues<span></span></span></p>
<p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif">The size of c<span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif">oherently reflecting domains</span>, also known as crystallites, is important issue for nano structures.<span></span></span></p>
<p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif">I used GSAS-II to calculate the domain sizes. I used
uniaxial domain size model and got <span style="background:white">equatorial =18.6
(1) nm axial 21.7 (2) nm</span>. These values are higher compared to other tools: GSAS (<span style="background:white">Dv=12), STEM (12(3)) or </span>Debye function analysis
<span style="background:white">(Da,b=13.7 (5.0) nm, Lc=14.0(5.7) nm). <span></span></span></span></p>
<p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif">Any idea what's wrong<span style="background:white">?<span></span></span></span></p>
<p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif;background:white">The procedure I used to calculate the domain size at
GSAS-II was as follows: </span><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif"><span></span></span></p>
<p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif">LaB6, NIST Standard Reference Material (SRM) 660a, was first
analyzed to define to instrumental parameters. In the phase data I used 2
micron for domain size and 330 for microstrain. (I also tried used 5 micron for
domain size and 1 for microstrain). I used these values as in the certification
of the SRM 660a it was stated that Rietveld analysis of the XRD data gave 2
micron for domain size and no strain broadening. (SEM analysis indicated that
the particles of LaB6 consist of aggregates of crystallites; the size of the
crystallites was in the 2 to 5 micron range). The instrumental parameters were refined.</span></p><p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%"><font face="Times New Roman, serif"><span style="font-size:12pt">Later I analyzed my data using the instrumental parameters I got from the LaB6 standard, without refining that </span><span style="font-size:16px">instrumental</span><span style="font-size:12pt"> data. Instead I refined the domain size and later microstrains of my phase.</span></font></p><p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-family:"Times New Roman",serif;font-size:12pt">By the way in GSAS (GSAS1) I just used parameters Lx and Gp to calculate the
size and Gu and Ly to calculate the microstrain.</span><span style="font-size:16px;font-family:"Times New Roman",serif"> </span></p>
<p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif">Thanks<span></span></span></p>
<p class="MsoNormal" dir="LTR" style="text-align:left;direction:ltr;unicode-bidi:embed;margin:0in 0in 10pt;line-height:115%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:115%;font-family:"Times New Roman",serif">Victor<span></span></span></p>
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