Qianlong Ji, Natalia A. Melnikova, Oleg V. Glumov, Igor V. Murin
{"title":"Highly conductive solid electrolytes in the PbF2-CaF2-KF system: mechanochemical synthesis, electrical properties, microstructure and stability","authors":"Qianlong Ji, Natalia A. Melnikova, Oleg V. Glumov, Igor V. Murin","doi":"10.1016/j.ssi.2025.117037","DOIUrl":"10.1016/j.ssi.2025.117037","url":null,"abstract":"<div><div>Fluorite-structure solid solutions with ultrahigh fluoride ion mobility are widely recognized as promising solid electrolytes for applications in solid-state electrochemical devices like fluoride ion batteries (FIBs). Herein, solid solutions in the PbF<sub>2</sub>-CaF<sub>2</sub>-KF system were prepared by mechanochemical synthesis. The structure and morphology of the synthesized solid solutions are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The fluoride ion conductivity of the samples is investigated by the electrochemical impedance spectroscopy (EIS). The results show that the fluorite-structure solid electrolyte β-Pb<sub>0.75</sub>Ca<sub>0.2</sub>K<sub>0.05</sub>F<sub>1.95</sub> with high ionic conductivity (1.46 × 10<sup>−3</sup> S/cm at 20 °C) can be obtained combined with brief low-temperature heat treatment.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117037"},"PeriodicalIF":3.3,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimization of Ba0.5Sr0.5Co0.8Fe0.2O3-δ-BaCe0.7Zr0.1Y0.1Yb0.1O3-δ composite electrodes: Influence of component ratio and current collector","authors":"Kristina Fedorova , Egor Gordeev , Olga Seliverstova , Ekaterina Antonova","doi":"10.1016/j.ssi.2025.117035","DOIUrl":"10.1016/j.ssi.2025.117035","url":null,"abstract":"<div><div>Composite Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3-δ</sub>-BaCe<sub>0.7</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3-δ</sub> electrodes were studied as promising cathodes for application in electrochemical devices based on a proton-conducting electrolyte. Electrochemical activity of electrodes with different ratio of components was investigated by impedance spectroscopy in the oxygen-containing atmospheres, humidified with H<sub>2</sub>O and D<sub>2</sub>O. The optimal ratio of components in the electrode was found to be 80/20 wt% Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3-δ</sub>/BaCe<sub>0.7</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3-δ</sub>. The polarization resistance of the electrode of such a composition is 0.8 Ohm*cm<sup>2</sup> at 650 °C in a H<sub>2</sub>O-humidified air atmosphere. The use of a current collector made it possible to reduce the polarization resistance to 0.5 Ohm*cm<sup>2</sup> under the same conditions. For all investigated compositions and conditions, the H/D isotope effect in the electrode response was detected. The influence of the ratio of the electrode components and the current collector on the mechanism of the electrode reaction is discussed.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117035"},"PeriodicalIF":3.3,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Synthesis and electrochemical performances of lithium-rich manganese-based oxides materials for next-generation batteries","authors":"Fuliang Guo , Jieyun Zheng , Guogan Xu , Zhenyu Zhang , Ronggang Wang , Xingyu Chen , Liang Yin","doi":"10.1016/j.ssi.2025.117034","DOIUrl":"10.1016/j.ssi.2025.117034","url":null,"abstract":"<div><div>Lithium-rich manganese-based oxides materials (LROs) have been extensively studied for next-generation lithium-ion batteries owing to their high capacity and low cost. However, challenges remain in addressing which pose significant barriers to achieving scalable manufacturing throughput, especially industrial-scale fabrication methodology. Herein, we explore the synthetic conditions including sintering temperature, lithium transition metal molar ratios (Li/TM) and sintering duration time to optimize electrochemical performances by using the Ni<sub>0.1625</sub>Co<sub>0.1625</sub><img>Mn<sub>0.6750</sub>CO<sub>3</sub> carbonate precursor. Results demonstrate that electrochemical performances are significantly affected by sintering temperatures and Li/TM ratios. LROs powders annealed at 350 °C for 2 h, 600 °C for 15 h and 900 °C for 2 h step by step under a Li/TM ratio of 1.35 achieved exceptional electrochemical performance: first discharge capacity of 287.12 mAh·g<sup>−1</sup> at 25 mA·g<sup>−1</sup> with a coulombic efficiency of 82.13 %, and retains 91.28 % of its capacity after 200 cycles at 250 mA·g<sup>−1</sup>. Moreover, this study elucidates the influence of sintering temperature, Li/TM ratios, and sintering duration time on the critical properties of LROs, including particle size, morphology, and phase composition, thereby offering a solid reference for scalable production.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117034"},"PeriodicalIF":3.3,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Thin-film X-ray diffractometry for evaluating effect of BaCO3 coating on the electrolyte of protonic ceramic fuel cells","authors":"Katsuhiro Nomura, Hiroyuki Shimada, Yuki Yamaguchi, Masaya Fujioka, Hirofumi Sumi, Yasunobu Mizutani","doi":"10.1016/j.ssi.2025.117030","DOIUrl":"10.1016/j.ssi.2025.117030","url":null,"abstract":"<div><div>The manufacturing of protonic ceramic fuel cells (PCFCs) involves high-temperature sintering at ∼1500 °C to form a dense electrolyte film. This process results in Ba evaporation, which complicates the control of the electrolyte surface composition. To address this problem, we herein examined the effect of modifying the electrolyte (Ba<sub>0.97</sub>Zr<sub>0.8</sub>Yb<sub>0.2</sub>O<sub>3−<em>δ</em></sub>, BZYb20d) surface in anode-supported PCFCs by BaCO<sub>3</sub> slurry coating followed by firing at 1300 °C. X-ray diffractometry (<em>θ</em>–2<em>θ</em> measurements) indicated a decrease in the amount of Yb<sub>2</sub>O<sub>3</sub> precipitated on the surface of the thus treated BZYb20d, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy revealed a decrease in the segregation of Yb<sub>2</sub>O<sub>3</sub> at the treated electrolyte surface. Thin-film X-ray diffractometry (<em>ω</em>–2<em>θ</em> measurement) revealed a change in the lattice constant of the BZYb20d electrolyte (thickness = 10 μm) in a BZYb20d/NiO-BZYb20d half-cell as a function of the X-ray penetration depth from the surface to the bulk (i.e., near the BZYb20d/NiO-BZYb20d interface) at 25–900 °C in air, dry N<sub>2</sub>, and wet N<sub>2</sub>. At 900 °C, the lattice constant of BZYb20d after the BaCO<sub>3</sub> treatment hardly changed upon going from the surface to the bulk, which suggested that the Ba content at the BZYb20d electrolyte surface was almost the same as that in the bulk. The thermal expansion coefficients and chemical expansion rates of the BZYb20d film electrolyte bulk were lower (∼0.66 and ∼ 0.33 times, respectively) than those of BaZr<sub>0.8</sub>Y<sub>0.2</sub>O<sub>2.9</sub> and BaZr<sub>0.8</sub>Yb<sub>0.2</sub>O<sub>3−<em>δ</em></sub> bulk. The BaCO<sub>3</sub> treatment increased the maximum power density of the corresponding PCFC from ∼0.5 to ∼0.6 W cm<sup>−2</sup>. The cathode fabricated using the modified BZYb20d electrolyte showed a lower polarization resistance (0.07 Ω cm<sup>2</sup>) than that based on the unmodified electrolyte (0.22 Ω cm<sup>2</sup>). The Ba deficiency of the BZYb20d electrolyte surface that developed during high-temperature sintering was alleviated by the BaCO<sub>3</sub> coating, and the interfacial resistance between the air electrode and electrolyte therefore decreased.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117030"},"PeriodicalIF":3.3,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Koichiro Fukuda, Aya Miyasawa, Daisuke Urushihara, Toru Asaka
{"title":"Ca2+ conduction in melilite structure type compound Ca2Ga2SiO7","authors":"Koichiro Fukuda, Aya Miyasawa, Daisuke Urushihara, Toru Asaka","doi":"10.1016/j.ssi.2025.117028","DOIUrl":"10.1016/j.ssi.2025.117028","url":null,"abstract":"<div><div>The potential for Ca<sup>2+</sup> conduction along the 〈001〉 and 〈110〉 directions in the melilite structure type compound Ca<sub>2</sub>Ga<sub>2</sub>SiO<sub>7</sub> (space group <em>P</em><span><math><mover><mn>4</mn><mo>¯</mo></mover></math></span>2<sub>1</sub><em>m</em>) has been elucidated through the utilization of the bond valence energy landscape method. The randomly grain-oriented polycrystal exhibited an increase in bulk conductivity for Ca<sup>2+</sup> (<em>σ</em><sub>bulk</sub>) from 6.24 × 10<sup>−10</sup> S cm<sup>−1</sup> at 573 K to 2.09 × 10<sup>−5</sup> S cm<sup>−1</sup> at 1073 K, with an activation energy of 1.146(10) eV. The transference number at 1073 K was 0.982. The <em>σ</em><sub>bulk</sub>-value of Ca<sub>2</sub>Ga<sub>2</sub>SiO<sub>7</sub> at each temperature from 673 to 1073 K was intermediate between those of the grossite structure type compounds CaGa<sub>4</sub>O<sub>7</sub> and CaAl<sub>4</sub>O<sub>7</sub>, while the <em>σ</em><sub>bulk</sub>-value of the NASICON-type compound (Ca<sub>0.05</sub>Hf<sub>0.9</sub>)<sub>4/3.9</sub>Nb(PO<sub>4</sub>)<sub>3</sub> at each temperature from 573 to 873 K was superior to those of these three compounds. The total conductivity for Ca<sup>2+</sup> of Ca<sub>2</sub>Ga<sub>2</sub>SiO<sub>7</sub> was more than 12.4 times larger than that of the NASICON-type compound CaZr<sub>4</sub>(PO<sub>4</sub>)<sub>6</sub> at each temperature from 923 to 1073 K.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117028"},"PeriodicalIF":3.3,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Structure and electrochemical properties of MgAl co-doped spinel LiMn2O4 cathode material","authors":"Yongsheng Yang PhD, Long Shi, Junming Guo","doi":"10.1016/j.ssi.2025.117031","DOIUrl":"10.1016/j.ssi.2025.117031","url":null,"abstract":"<div><div>Mg<img>Al co-doping and single-crystal truncated octahedral morphology strategy was employed to suppress and mitigate the Jahn-Teller distortion and Mn dissolution in spinel-type LiMn<sub>2</sub>O<sub>4</sub> materials. LiMg<sub>0.10</sub>Al<sub><em>y</em></sub>Mn<sub>1.90-<em>y</em></sub>O<sub>4</sub> (<em>y</em> = 0.03, 0.05, 0.08, 0.10, and 0.12) cathode materials were synthesized via solid-phase combustion method and the effects of varying Al contents on the crystal structures, single-crystal truncated octahedral morphology, valence states of doped elements, rate and long-cycle electrochemical performance, and Li<sup>+</sup> ion migration kinetics of spinel-type LiMn<sub>2</sub>O<sub>4</sub> materials were investigated. The results indicate that Mg<img>Al co-doping promotes the crystalline development of spinel-type LiMn<sub>2</sub>O<sub>4</sub> material and the preferential growth of {111}, {100}, and {110} crystal planes, forming complete single-crystal truncated octahedral morphology. Among samples with different Mg and Al doping levels, the Mg<img>Al co-doped sample LiMg<sub>0.10</sub>Al<sub>0.05</sub>Mn<sub>1.85</sub>O<sub>4</sub> exhibits superior capacity and cycle stability. At a low rate of 1C, the initial discharge specific capacity is 114.7 mAh·g<sup>−1</sup>, with an 93.6 % capacity retention after 200 cycles; at high rates of 10, 15, and 20C, the initial discharge specific capacities are 94.4, 92.4, and 84.5 mAh·g<sup>−1</sup> respectively, with capacity retention rates of 84.1 %, 76.9.2 %, and 81.7 % after 1000 cycles; at high temperatures of 55 °C and rates of 1C, 5C and 10C, the initial discharge specific capacities are 113.7, 111.1 and 100.5 mAh·g<sup>−1</sup> respectively, with retention rates of 68.6 %, 46.1 % and 37.8 % after 200, and 500 cycles. The LiMg<sub>0.10</sub>Al<sub>0.05</sub>Mn<sub>185</sub>O<sub>4</sub> sample has the lowest charge transfer resistance (168.6 Ω) and apparent activation energy (32.39 kJ·mol<sup>−1</sup>), and the highest Li<sup>+</sup> diffusion coefficient (1.20 × 10<sup>−11</sup> cm<sup>2</sup>·s<sup>−1</sup>). This indicates that during charging and discharging, Li<sup>+</sup> ions in this sample encounter lower resistance and energy barriers, resulting in faster migration rates, which can enhance the material's rate capacity and cycling stability.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117031"},"PeriodicalIF":3.3,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhenhong Tian , Li-ang Zhu , Jingxiu Tian , Hongshun Miao , Yinghui Jiang , Rongkang Tan , Xiangxin Li , Yan Liu
{"title":"Study on the structure and electrochemical properties of double-doped regulated P2/O3 cophasic sodium-ion batteries","authors":"Zhenhong Tian , Li-ang Zhu , Jingxiu Tian , Hongshun Miao , Yinghui Jiang , Rongkang Tan , Xiangxin Li , Yan Liu","doi":"10.1016/j.ssi.2025.117029","DOIUrl":"10.1016/j.ssi.2025.117029","url":null,"abstract":"<div><div>A trace Ti/Mg co-doped Na<sub>0.8</sub>Ni<sub>0.35</sub>Mn<sub>0.48</sub>Ti<sub>0.12</sub>Mg<sub>0.05</sub>O<sub>2</sub> (TiMg-NNM) cathode was synthesized, where Ti ions are located in the transition metal layers and Mg ions are incorporated into the sodium layers. The co-doping expands the Na-layer spacing within the layered structure, thereby lowering the diffusion barrier for Na-ions. Structural stability is significantly enhanced due to the robust Ti<img>O bond and the pillar-like effect of Mg ions, which also helps to minimize surface side reactions with the electrolyte. The merits endow a high reversible capacity of TiMg-NNM cathode with 130.5 mAh/g at 1C, the 85.8 % capacity retention rate at 100 cycles at 1C, much greater than 35.6 % of NNM. The synergistic effect of P2 and O3 phases was strengthened by the doping of Mg and Ti, so that the obtained NNMMT had high electrochemical stability. The research offers a practical approach and fresh perspectives for designing high-performance layered oxide cathode materials with improved structural and interfacial stability for SIBs.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117029"},"PeriodicalIF":3.3,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Ramakrushna Achary , Sumit Khatua , Kshatri Durga Lalitha Bai , Guruprasad Sahoo , L.N. Patro
{"title":"Exploring the structural and conductivity behaviours of mechanochemically and hydrothermally synthesized Ce3+-doped BaSnF4 solid electrolytes for all-solid-state fluoride-ion batteries","authors":"K. Ramakrushna Achary , Sumit Khatua , Kshatri Durga Lalitha Bai , Guruprasad Sahoo , L.N. Patro","doi":"10.1016/j.ssi.2025.117032","DOIUrl":"10.1016/j.ssi.2025.117032","url":null,"abstract":"<div><div>Recent studies on batteries have drawn significant attention to all-solid-state fluoride-ion batteries (FIBs) as potential alternatives to the conventional Li-ion batteries because of their higher theoretical energy densities. On the solid electrolyte side, efforts are being made to develop a suitable material with improved ionic conductivity (∼ 10<sup>−3</sup> S/cm) and enhanced electrochemical stability. SnF<sub>2</sub>-based solid electrolyte, BaSnF<sub>4</sub> crystallizes in the PbSnF<sub>4</sub> structure and is frequently considered as a potential solid electrolyte for FIBs operating at room temperature (RT). In this study, the conductivity results of BaSnF<sub>4</sub> are influenced by doping with rare-earth ions (Ce<sup>3+</sup>) at different concentrations and by the synthesis methodology. The structural and transport behaviours of Ce<sup>3+</sup>-doped BaSnF<sub>4</sub> solid electrolytes, prepared by mechanical milling and hydrothermal methods, are compared. The formation of the doped materials, which exhibit a tetragonal phase, is confirmed by X-ray diffraction. The presence of Ce<sup>3+</sup> in the doped materials prepared by both methods is confirmed by their photoluminescence characteristics. Among the materials investigated in this study, 2 mol% Ce<sup>3+</sup>-doped BaSnF<sub>4</sub>, prepared by mechanical milling (Ba<sub>0.98</sub>Ce<sub>0.02</sub>SnF<sub>4.02</sub>-MM) exhibits the highest ionic conductivity and electrochemical stability. The conductivity (RT) exhibited by Ba<sub>0.98</sub>Ce<sub>0.02</sub>SnF<sub>4.02</sub>-MM is higher compared to earlier reports on different rare-earth ion-doped BaSnF<sub>4</sub>, which were primarily prepared by solution-based methods. Ion transport number measurement using <em>dc</em> polarization technique revealed that the conductivity exhibited by Ba<sub>0.98</sub>Ce<sub>0.02</sub>SnF<sub>4.02</sub>-MM is mainly due to ionic conduction. The observation of a higher ionic conductivity value in Ba<sub>0.98</sub>Ce<sub>0.02</sub>SnF<sub>4.02</sub>-MM highlights its great potential for use as a solid electrolyte in the fabrication of FIBs.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117032"},"PeriodicalIF":3.3,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optoionics – Controlling ions with light","authors":"A. Gouder , B.V. Lotsch","doi":"10.1016/j.ssi.2025.117018","DOIUrl":"10.1016/j.ssi.2025.117018","url":null,"abstract":"<div><div>Optoionics has recently emerged at the intersection of optoelectronics and solid state ionics, triggered by fundamental work on light-induced ionic conductivity enhancement in methylammonium lead iodide (MAPI). This perspective traces the evolution of optoionics from early 20th century studies on photoionics to contemporary research, elucidating the semantic nuances and historical development of light–ion interactions. We follow the first observations such as copper photoionization and subsequent conceptual extensions such as molecular photoionics and photo-ionic cells, leading on to the current definition and understanding of optoionics. We then proceed to apply this understanding on light–ion interactions in carbon nitrides, distinguishing between intrinsic and extrinsic optoionic effects depending on whether one or more distinct phases are involved. This nuanced understanding is essential for the design of optoionic devices that exploit light–ion interactions to couple light harvesting and electrochemical energy storage. Finally, we provide an outlook on emerging optoionic devices at the intersection of energy conversion and storage and discuss smart circuit elements that integrate optoionic principles for advanced technological applications.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117018"},"PeriodicalIF":3.3,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Apparent non-monotonic electrical conductivity relaxation of 1 % Gd-doped ceria","authors":"Yizhou Shen, Reidar Haugsrud","doi":"10.1016/j.ssi.2025.117016","DOIUrl":"10.1016/j.ssi.2025.117016","url":null,"abstract":"<div><div>Steady-state and transient electrical conductivities of 1 % Gd-substituted ceria have been characterized from 550 to 800 °C under oxidizing conditions. The temperature and oxygen pressure dependencies of the steady-state conductivity resemble those of pristine ceria, with predominant n-type conductivity and some contribution of p-type conductivity under the most oxidizing conditions. Depending on temperature and oxygen partial pressure, the relaxation of the conductivity follows one-fold monotonic, two-fold monotonic, or non-monotonic behavior, despite the predominance of two charge carriers in the bulk material. Possible explanations for this peculiar phenomenon are discussed based on surface-exchange-limited oxygen exchange.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"431 ","pages":"Article 117016"},"PeriodicalIF":3.3,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145107090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}