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1. Phase Behavior and Superprotonic Conductivity in the System (1– x )CsH 2 PO 4 – x H 3 PO 4 : Discovery of Off-Stoichiometric α-[Cs 1–x H x ]H 2 PO 4

   https://doi.org/10.1021/acs.chemmater.1c04061  

   Wang, Louis S. ; Patel, Sawankumar V. ; Truong, Erica ; Hu, Yan-Yan ; Haile, Sossina M. ( February 2022 , Chemistry of Materials)
2. Recent Advances in Conduction Mechanisms, Synthesis Methods, and Improvement Strategies for Li 1+ x Al x Ti 2− x (PO 4 ) 3 Solid Electrolyte for All‐Solid‐State Lithium Batteries

   https://doi.org/10.1002/aenm.202203440  

   Wu, Pengfei ; Zhou, Weiwei ; Su, Xin ; Li, Jianyu ; Su, Min ; Zhou, Xiaochong ; Sheldon, Brian W. ; Lu, Wenquan ( December 2022 , Advanced Energy Materials)

   With the increasing use of Li batteries for storage, their safety issues and energy densities are attracting considerable attention. Recently, replacing liquid organic electrolytes with solid‐state electrolytes (SSE) has been hailed as the key to developing safe and high‐energy‐density Li batteries. In particular, Li_1+xAl_xTi_2−x(PO4)₃(LATP) has been identified as a very attractive SSE for Li batteries due to its excellent electrochemical stability, low production costs, and good chemical compatibility. However, interfacial reactions with electrodes and poor thermal stability at high temperatures severely restrict the practical use of LATP in solid‐state batteries (SSB). Herein, a systematic review of recent advances in LATP for SSBs is provided. This review starts with a brief introduction to the development history of LATP and then summarizes its structure, ion transport mechanism, and synthesis methods. Challenges (e.g., intrinsic brittleness, interfacial resistance, and compatibility) and corresponding solutions (ionic substitution, additives, protective layers, composite electrolytes, etc.) that are critical for practical applications are then discussed. Last, an outlook on the future research direction of LATP‐based SSB is provided.

    

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3. Optical second harmonic generation imaging and x-ray diffraction of Cs 1 − x Rb x H 2 PO 4 proton conductor series

   https://doi.org/10.1063/5.0006922  

   Price, Alex D. ; Aguilar, Angela C. ; Botez, Cristian E. ; Li, Chunqiang ( May 2020 , Journal of Applied Physics)
4. Elucidating the Impact of Mg Substitution on the Properties of NASICON‐Na 3+ y V 2− y Mg y (PO 4 ) 3 Cathodes

   https://doi.org/10.1002/adfm.202105463  

   Ghosh, Subham ; Barman, Nabadyuti ; Gonzalez‐Correa, Eliovardo ; Mazumder, Madhulika ; Zaveri, Aryan ; Giovine, Raynald ; Manche, Alexis ; Pati, Swapan K. ; Clément, Raphaële J. ; Senguttuvan, Premkumar ( August 2021 , Advanced Functional Materials)

   Vanadium multiredox‐based NASICON‐Na_zV_2−yM_y(PO₄)₃(3 ≤z ≤ 4; M = Al³⁺, Cr³⁺, and Mn²⁺) cathodes are particularly attractive for Na‐ion battery applications due to their high Na insertion voltage (>3.5 V vs Na⁺/Na⁰), reversible storage capacity (≈150 mA h g⁻¹), and rate performance. However, their practical application is hindered by rapid capacity fade due to bulk structural rearrangements at high potentials involving complex redox and local structural changes. To decouple these factors, a series of Mg²⁺‐substituted Na_3+yV_2−yMg_y(PO₄)₃(0 ≤y ≤ 1) cathodes is studied for which the only redox‐active species is vanadium. While X‐ray diffraction (XRD) confirms the formation of solid solutions between they = 0 and 1 end members, X‐ray absorption spectroscopy and solid‐state nuclear magnetic resonance reveal a complex evolution of the local structure upon progressive Mg²⁺substitution for V³⁺. Concurrently, the intercalation voltage rises from 3.35 to 3.45 V, due to increasingly more ionic VO bonds, and the sodium (de)intercalation mechanism transitions from a two‐phase fory ≤ 0.5 to a solid solution process fory ≥ 0.5, as confirmed by in operando XRD, while Na‐ion diffusion kinetics follow a nonlinear trend across the compositional series.

    

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5. Ferromagnetic and magnetostrictive properties of Tb 0.3 Dy 0.7 (Co 1−x Fe x ) 2 alloys

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   Zhou, Chao ; Zeng, Yuyang ; Chang, Tieyan ; Wang, Yu ; Zhang, Azhen ; Liu, Shuyi ; Tian, Fanghua ; Zhang, Yin ; Song, Xiaoping ; Yang, Sen ( May 2019 , Japanese Journal of Applied Physics)