Table S1: Refinement details for the single crystal X-ray diffraction of CeNbO4.25. Crystal size 0.1 x 0.1 x 0.1 mm Crystal system Monoclinic group (no. 14) P121/c1 Temperature 298 K Unit cell dimensions (Å) 14.3732(8) a (Å) 22.7921(12) b (Å) 11.8319(6) c 105.071(2) (°)  (Å3) 3742.8(3) V 48 Z Density (g cm-3) 6.3233 17.903  (cm-1) Radiation Mo K (0.71069 Å) 1.47-32.63 Collection limits (,°) Data measured 67054 Unique reflections 13566 8604 Reflections with 3(I) I ≥ R 0.0431 Rw 0.0945 GOF 1.79 D residual (e Å-3) + 4.99 - -3.93 Table S2: Refined atomic positions and anisotropic displacement parameters for CeNbO4.25 derived from single crystal X-ray diffraction. S.G. = 14.3732(8) = a c Å 11.8319(6) Å = P121/c1 b = β 22.7921(12) Å 105.071(2)° Site x y z UIso Ce4+(1) 0.57897(4) 0.19103(2) 0.08329(4) 0.00732(15) Ce4+(2) 0.56366(2) 0.21997(5) 0.00842(14) Ce4+(3) 0.24153(4) 0.18156(2) 0.72620(5) 0.00808(15)
Table S1: Refinement details for the single crystal X-ray diffraction of CeNbO4.25. Crystal size 0.1 x 0.1 x 0.1 mm Crystal system Monoclinic group P121/c1 (no. 14) Temperature 298 K Unit cell dimensions a (Å) 14.3732(8) b (Å) 22.7921(12) c (Å) 11.8319(6)  (°) 105.071(2) V (Å3) 3742.8(3) Z 48 Density (g cm-3) 6.3233  (cm-1) 17.903 Radiation Mo K (0.71069 Å) Collection limits (,°) 1.47-32.63 Data measured 67054 Unique reflections 13566 Reflections with I ≥ 3(I) 8604 R 0.0431 Rw 0.0945 GOF 1.79 D residual (e Å-3) + 4.99 - -3.93 Table S2: Refined atomic positions and anisotropic displacement parameters for CeNbO4.25 derived from single crystal X-ray diffraction. S.G. a = 14.3732(8) Å c = 11.8319(6) Å P121/c1 b = 22.7921(12) Å β = 105.071(2)° Site x y z UIso Ce4+(1) 0.57897(4) 0.19103(2) 0.08329(4) 0.00732(15) Ce4+(2) 0.56366(2) 0.21997(5) 0.00842(14) Ce4+(3) 0.24153(4) 0.18156(2) 0.72620(5) 0.00808(15)
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