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1. Barium in deep-sea bamboo corals: Phase associations, barium stable isotopes, & prospects for paleoceanography

   https://doi.org/10.1016/j.epsl.2019.115751  

   Geyman, Ben M. ; Ptacek, Jamie L. ; LaVigne, Michèle ; Horner, Tristan J. ( November 2019 , Earth and Planetary Science Letters)
2. Dissolved and Particulate Barium Distributions Along the US GEOTRACES North Atlantic and East Pacific Zonal Transects (GA03 and GP16): Global Implications for the Marine Barium Cycle

   https://doi.org/10.1029/2022GB007330  

   Rahman, Shaily ; Shiller, Alan M. ; Anderson, Robert F. ; Charette, Matthew A. ; Hayes, Christopher T. ; Gilbert, Melissa ; Grissom, Karen R. ; Lam, Phoebe J. ; Ohnemus, Daniel C. ; Pavia, Frank J. ; et al ( June 2022 , Global Biogeochemical Cycles)

   Processes controlling dissolved barium (dBa) were investigated along the GEOTRACES GA03 North Atlantic and GP16 Eastern Tropical Pacific transects, which traversed similar physical and biogeochemical provinces. Dissolved Ba concentrations are lowest in surface waters (∼35–50 nmol kg⁻¹) and increase to 70–80 and 140–150 nmol kg⁻¹in deep waters of the Atlantic and Pacific transects, respectively. Using water mass mixing models, we estimate conservative mixing that accounts for most of dBa variability in both transects. To examine nonconservative processes, particulate excess Ba (pBa_xs) formation and dissolution rates were tracked by normalizing particulate excess²³⁰Th activities. Th‐normalized pBa_xsfluxes, with barite as the likely phase, have subsurface maxima in the top 1,000 m (∼100–200 μmol m⁻² year⁻¹average) in both basins. Barite precipitation depletes dBa within oxygen minimum zones from concentrations predicted by water mass mixing, whereas inputs from continental margins, particle dissolution in the water column, and benthic diffusive flux raise dBa above predications. Average pBa_xsburial efficiencies along GA03 and GP16 are ∼37% and 17%–100%, respectively, and do not seem to be predicated on barite saturation indices in the overlying water column. Using published values, we reevaluate the global freshwater dBa river input as 6.6 ± 3.9 Gmol year⁻¹. Estuarine mixing processes may add another 3–13 Gmol year⁻¹. Dissolved Ba inputs from broad shallow continental margins, previously unaccounted for in global marine summaries, are substantial (∼17 Gmol year⁻¹), exceeding terrestrial freshwater inputs. Revising river and shelf dBa inputs may help bring the marine Ba isotope budget more into balance.

    

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3. Dynamic Barriers to Crystallization of Calcium Barium Carbonates

   https://doi.org/10.1021/acs.cgd.1c00433  

   Whittaker, Michael L. ; Sun, Wenhao ; Duggins, Danielle O. ; Ceder, Gerbrand ; Joester, Derk ( August 2021 , Crystal Growth & Design)
4. Role of Dopants in Fine-Tuning the Electrical and Catalytic Properties of Barium Niobate Perovskites Towards High-Temperature Electrolyzer Application

   https://doi.org/10.1149/11106.1139ecst  

   Ramaiyan, Kannan ; Denoyer, Luke H ; Benavidez, Angelica ; Garzon, Fernando H. ( May 2023 , ECS Transactions)

   Perovskite materials are used for high temperature electrochemical applications such as solid oxide fuel cells (SOFC) and electrolyzers due to their tunable conductivity and catalytic activity. However, high temperature operation poses significant challenges in both fabrication and durable operation that is further complicated by the operating environment. We studied barium niobates with various A and B site dopants. These doped niobates showed enhanced thermochemical stability in SOFC relevant conditions and catalytic activity towards methane activation. The redox behavior of the Nb^4+/5+couple seem to be at a key reason behind this redox stability while the size and electronegativity of the dopants affect the electrical properties. The chemical stability was analyzed by TGA measurements followed by analysis of the perovskite powders using PXRD measurements. Impedance measurements were utilized to analyze their electrical conductivity. Our results demonstrate doped barium niobates as a promising candidate for stable operation in high temperature electrochemical applications.

    

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5. Barium and titanium dithiocarbamates as precursors for colloidal nanocrystals of emerging optoelectronic materials

   https://doi.org/10.1039/d1dt03018c  

   Ingram, Nicole E. ; Jordan, Brian J. ; Donnadieu, Bruno ; Creutz, Sidney E. ( November 2021 , Dalton Transactions)

   The synthesis and structures of N , N -dialkyldithiocarbamate complexes of barium are reported; the compounds crystallize as one-dimensional coordination polymers. In combination with a titanium dithiocarbamate precursor, the compounds are demonstrated as competent single-source precursors for the solution-based preparation of colloidal BaTiS 3 nanorods. 

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