Table 1 Fitted XRD crystallite sizes and dispersion for Ti and Co phases.

The error in the average sizes is ±0.5 nm.

Sample and conditionPhases and average crystallite sizes (nm)Dispersion
TiO2Co3O4CoOCubic CoIntergrown CoCubic Co dispersionIntergrown Co dispersion*
ConventionalCalcined3.010.06.0
Reduced3.06.93.313.929.1
FTS (2 bar)3.06.09.56.510.114.8
InverseCalcined12.57.0
Reduced9.03.010.732
FTS (2 bar)8.53.011.332

*Co dispersion was estimated using the formula D = 96/d, where D (%) is Co dispersion and d (nm) is Co particle size (62), assuming uniform spheres of Co and a site density of 15.2 atoms/nm2. If the intergrown and cubic domains are part of a larger particle, then the average particle size will be somewhat larger than that reported, and consequently, the dispersion will be lower.