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1. Samarium-Activated La ₂ Hf ₂ O ₇ Nanoparticles as Multifunctional Phosphors

   https://doi.org/10.1021/acsomega.9b01318  

   Gupta, Santosh K.; Abdou, Maya; Zuniga, Jose P.; Puretzky, Alexander A.; Mao, Yuanbing (October 2019, ACS Omega)
2. Nonaqueous Polymer Combustion Synthesis of Cubic Li ₇ La ₃ Zr ₂ O ₁₂ Nanopowders

   https://doi.org/10.1021/acsami.9b19981  

   Weller, J. Mark; Whetten, Justin A.; Chan, Candace K. (December 2019, ACS Applied Materials & Interfaces)

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3. Tortuosity Effects in Garnet-Type Li ₇ La ₃ Zr ₂ O ₁₂ Solid Electrolytes

   https://doi.org/10.1021/acsami.8b16536  

   Dixit, Marm B.; Regala, Matthew; Shen, Fengyu; Xiao, Xianghui; Hatzell, Kelsey B. (December 2018, ACS Applied Materials & Interfaces)
4. On structure and phase transformation of uranium doped La ₂ Hf ₂ O ₇ nanoparticles as an efficient nuclear waste host

   https://doi.org/10.1039/c8qm00266e  

   Abdou, Maya; Gupta, Santosh K.; Zuniga, Jose P.; Mao, Yuanbing (November 2018, Materials Chemistry Frontiers)

   The design and development of efficient and stable nuclear waste hosts has drawn intensive interest for long-lived lanthanides and actinides. A detailed investigation of their structure and potential structural evolution are crucial. In this study, we have synthesized lanthanum hafnate La 2 Hf 2 O 7 nanoparticles (NPs) doped with uranium at different concentrations (0–10%) and investigated their structural transition. We have discovered that in our La 2 Hf 2 O 7 :U NPs, the uranium dopants are stabilized at both U 4+ and U 6+ oxidation states in which the U 6+ oxidation state exists in octahedral uranate UO 6 6− form. We also confirmed that the U 4+ ions substituted the Hf 4+ ions with a lifetime of ∼1.0 μs and the UO 6 6− ions resided at the La 3+ sites with a lifetime of ∼9.0 μs. More interestingly, the proportion of the U 4+ ions in the La 2 Hf 2 O 7 :U NPs was higher than that of the UO 6 6− ions at low doping level, but at the doping level higher than 2.5%, the fraction of the UO 6 6− ions was greater than that of the U 4+ ions. Furthermore, we studied the structural phase transformation from order pyrochlore to cotunnite of these La 2 Hf 2 O 7 :U NPs with increasing uranium doping level, and found that ordered pyrochlore phase favors the U 4+ ions whereas disordered cotunnite phase favors the UO 6 6− ions. We further used in situ Raman spectroscopy to confirm the reversible cotunnite to pyrochlore phase transformation of the La 2 Hf 2 O 7 :10%U NPs at 900 °C. Therefore, this work demonstrated the successful development of uranium doped La 2 Hf 2 O 7 NPs and thorough characterization of the fundamental spectra of uranium ions, doping induced phase transformation, and structure–optical property correlation. 

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5. Needleless Electrospinning for High Throughput Production of Li ₇ La ₃ Zr ₂ O ₁₂ Solid Electrolyte Nanofibers

   https://doi.org/10.1021/acs.iecr.9b03376  

   Rosenthal, Tanner; Weller, J. Mark; Chan, Candace K. (September 2019, Industrial & Engineering Chemistry Research)