XRD analysis of the SMP and MMP magnets. (a) Rietveld refinement of step-scanned XRD patterns for La/Ce-containing SMP and MMP magnets (in powders) at room temperature. Experimental pattern, calculated pattern, and their differences are shown in black, red, and blue colors, respectively. The difference pattern in each curve indicates a good matching between the calculated and experimental values. The enlarged XRD patterns of 2θ between 32.8° and 35° are shown in (b). Bottom ticks in (c) mark the characteristic Bragg positions of the RE₂Fe₁₄B/RE-rich phase, and serve as a guide to the eye.^[22]