Subject:

**Crystal Density**
At Rietveld refinement (using TOPAS v.3.0) of XRD pattern obtained from Ruthenium-containing material a strange result was obtained-in TOPAS report the value of Crystal density of Ruthenium was given as 37.933(36) g/cm3. Can this error be eliminated? Does it affect of quantitative analysis result?

Structure 1

Phase name Ruthenium

R-Bragg 1.336

Spacegroup P63/mmc

Cell Mass 606.423

Cell Volume (Å^3) 26.764(47)

Wt% - Rietveld 35.9(20)

Crystallite Size

k: 0.89 LVol-FWHM (nm) 6.37(19)

Crystal Linear Absorption Coeff. (1/cm) 6644(12)

Crystal Density (g/cm^3) 37.625(65)

Lattice parameters

a (Å) 2.6896(21)

c (Å) 4.2722(35)

Site Np x y z Atom Occ Beq

Ru1 6 0.33330 0.66670 0.25000 Ru 1 0.50(21)

Structure 1

Phase name Ruthenium

R-Bragg 1.336

Spacegroup P63/mmc

Cell Mass 606.423

Cell Volume (Å^3) 26.764(47)

Wt% - Rietveld 35.9(20)

Crystallite Size

k: 0.89 LVol-FWHM (nm) 6.37(19)

Crystal Linear Absorption Coeff. (1/cm) 6644(12)

Crystal Density (g/cm^3) 37.625(65)

Lattice parameters

a (Å) 2.6896(21)

c (Å) 4.2722(35)

Site Np x y z Atom Occ Beq

Ru1 6 0.33330 0.66670 0.25000 Ru 1 0.50(21)