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1. Effect of annealing atmosphere p O 2 on leakage current in 80(Bi 0.5 Na 0.5 )TiO 3 -20(Bi 0.5 K 0.5 )TiO 3 piezoelectric thin films

   https://doi.org/10.1063/1.4981771  

   Walenza-Slabe, J. ; Gibbons, B. J. ( April 2017 , Applied Physics Letters)
2. Kinetics of the Topochemical Transformation of (PbSe) m (TiSe 2 ) n (SnSe 2 ) m (TiSe 2 ) n to (Pb 0.5 Sn 0.5 Se) m (TiSe 2 ) n

   https://doi.org/10.1021/jacs.8b10681  

   Sutherland, Duncan R. ; Merrill, Devin R. ; Ditto, Jeffrey ; Moore, Daniel B. ; Medlin, Douglas ; Johnson, David C. ( January 2019 , Journal of the American Chemical Society)
3. Effect of R-site element on crystalline phase and thermal stability of Fe substituted Mn mullite-type oxides: R 2 (Mn 1−x Fe x ) 4 O 10−δ (R = Y, Sm or Bi; x = 0, 0.5, 1)

   https://doi.org/10.1039/C7RA09699B  

   Thampy, Sampreetha ; Ashburn, Nickolas ; Martin, Thomas J. ; Li, Chenzhe ; Zheng, Yongping ; Chan, Julia Y. ; Cho, Kyeongjae ; Hsu, Julia W. ( January 2018 , RSC Advances)

   Combining experimental and theoretical studies, we investigate the role of R-site (R = Y, Sm, Bi) element on the phase formation and thermal stability of R 2 (Mn 1−x Fe x ) 4 O 10−δ ( x = 0, 0.5, 1) mullite-type oxides. Our results show a distinct R-site dependent phase behavior for mullite-type oxides as Fe is substituted for Mn: 100% mullite-type phase was formed in (Y, Sm, Bi) 2 Mn 4 O 10 ; 55% and 18% of (Y, Sm) 2 Mn 2 Fe 2 O 10−δ was found when R = Y and Sm, respectively, for equal Fe and Mn molar concentrations in the reactants, whereas Bi formed 54% O10- and 42% O9-mixed mullite-type phases. Furthermore, when the reactants contain 100% Fe, no mullite-type phase was formed for R = Y and Sm, but a sub-group transition to Bi 2 Fe 4 O 9 O9-phase was found for R = Bi. Thermogravimetric analysis and density functional theory (DFT) calculation results show a decreasing thermal stability in O10-type structure with increasing Fe incorporation; for example, the decomposition temperature is 1142 K for Bi 2 Mn 2 Fe 2 O 10−δ vs. 1217 K for Bi 2 Mn 4 O 10 . On the other hand, Bi 2 Fe 4 O 9 O9-type structure is found to be thermally stable up to 1227 K. These findings are explained by electronic structure calculations: (1) as Fe concentration increases, Jahn–Teller distortion results in mid band-gap empty states from unstable Fe 4+ occupied octahedra, which is responsible for the decrease in O10 structure stability; (2) the directional sp orbital hybridization unique to Bi effectively stabilizes the mullite-type structure as Fe replaces Mn. 

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4. High resolution photoelectron imaging of boron-bismuth binary clusters: Bi 2 B n − ( n = 2–4)

   https://doi.org/10.1063/1.5084170  

   Cheung, Ling Fung ; Czekner, Joseph ; Kocheril, G. Stephen ; Wang, Lai-Sheng ( February 2019 , The Journal of Chemical Physics)
5. Improved stability and high thermoelectric performance through cation site doping in n-type La-doped Mg 3 Sb 1.5 Bi 0.5

   https://doi.org/10.1039/c8ta08975b  

   Imasato, Kazuki ; Wood, Max ; Kuo, Jimmy Jiahong ; Snyder, G. Jeffrey ( October 2018 , Journal of Materials Chemistry A)

   n-Type conduction in a Mg 3 Sb 1.5 Bi 0.5 system is achieved with La-doping at cation sites with a peak zT > 1. La-doped samples exhibit much higher doping efficiency and dopability compared to other chalcogen-doped samples. This allows greater tunability of the electronic properties. La-doping also significantly improves the thermal stability of n-type Mg 3 Sb 1.5 Bi 0.5 measured via a long-term Hall carrier concentration measurement. 

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