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001029087 1001_ $$0P:(DE-Juel1)176900$$aMurphy, Gabriel L.$$b0
001029087 245__ $$aProbing the Long- and Short-Range Structural Chemistry in the C-Type Bixbyite Oxides Th 0.40 Nd 0.48 Ce 0.12 O 1.76 , Th 0.47 Nd 0.43 Ce 0.10 O 1.785 , and Th 0.45 Nd 0.37 Ce 0.18 O 1.815 via Synchrotron X-ray Diffraction and Absorption Spectroscopy
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001029087 520__ $$aThe long- and short-range structural chemistry of the C-type bixbyite compounds Th0.40Nd0.48Ce0.12O1.76, Th0.47Nd0.43Ce0.10O1.785, and Th0.45Nd0.37Ce0.18O1.815 is systematically examined using synchrotron X-ray powder diffraction (S-PXRD), high-energy resolution fluorescence detection X-ray absorption near edge (HERFD-XANES), and extended X-ray absorption fine structure spectroscopy (EXAFS) measurements supported by electronic structure calculations. S-PXRD measurements revealed that the title compounds all form classical C-type bixbyite structures in space group Ia3̅ that have disordered cationic crystallographic sites with further observation of characteristic superlattice reflections corresponding to oxygen vacancies. Despite the occurrence of oxygen vacancies, HERFD-XANES measurements on the Ce L3-edge revealed that Ce incorporates as Ce4+ into the structures but involves local distortion that resembles cluster behavior and loss of nearest-neighbors. In comparison, HERFD-XANES measurements on the Nd L3-edge supported by electronic structure calculations reveal that Nd3+ adopts a local coordination environment similar to the long-range C-type structure while providing charge balancing for the formation of oxygen defects. Th L3-edge EXAFS analysis reveals shorter average Th–O distances in the title compounds in comparison to pristine ThO2 in addition to shorter Th–O and Th–Ce distances compared to Th–Th or Ce–Ce in the corresponding F-type binary oxides (ThO2 and CeO2). These distances are further found to decrease with the increased Nd content of the structures despite simultaneous observation of the overall lattice structure progressively expanding. Linear combination calculations of the M-O bond lengths are used to help explain these observations, where the role of oxygen defects, via Nd3+ incorporation, induces local bond contraction and enhanced Th cation valence, leading to the observed increased lattice expansion with progressive Nd3+ incorporation. Overall, the investigation points to the significance of dissimilar cations exhibiting variable short-range chemical behavior and how it can affect the long-range structural chemistry of complex oxides.
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001029087 7001_ $$0P:(DE-HGF)0$$aBazarkina, Elena$$b1
001029087 7001_ $$0P:(DE-HGF)0$$aSvitlyk, Volodymyr$$b2
001029087 7001_ $$0P:(DE-HGF)0$$aRossberg, André$$b3
001029087 7001_ $$0P:(DE-Juel1)186623$$aPotts, Shannon$$b4$$ufzj
001029087 7001_ $$00000-0001-6393-2778$$aHennig, Christoph$$b5
001029087 7001_ $$0P:(DE-Juel1)176390$$aHenkes, Maximilian$$b6$$ufzj
001029087 7001_ $$00000-0003-4447-4542$$aKvashnina, Kristina O.$$b7
001029087 7001_ $$00000-0002-9930-2329$$aHuittinen, Nina$$b8
001029087 773__ $$0PERI:(DE-600)2861993-6$$a10.1021/acsomega.4c02200$$gVol. 9, no. 25, p. 27397 - 27406$$n25$$p27397 - 27406$$tACS omega$$v9$$x2470-1343$$y2024
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