التفاصيل البيبلوغرافية
| العنوان: |
Structure modification and electrical properties by Mn2O3 dopant addition to SnO2 varistor system. |
| المؤلفون: |
Padilla-Zarate, E.A.1,2 (AUTHOR), Pech-Canul, M.I.3 (AUTHOR), Hernández, M.B.2 (AUTHOR), García-Ortiz, L.2 (AUTHOR), Toxqui-Terán, A.4 (AUTHOR), Aguilar-Martínez, J.A.1,2 (AUTHOR) josue.aguilar74@gmail.com |
| المصدر: |
Ceramics International. May2024:Part B, Vol. 50 Issue 9, p15452-15460. 9p. |
| مصطلحات موضوعية: |
*ELECTRIC displacement, *STANNIC oxide, *DOPING agents (Chemistry), *CARBON dioxide, *ELECTRIC breakdown, *CHROMIUM |
| مستخلص: |
This work aims to study the effect of Mn 2 O 3 additions on the electrical properties and microstructure characteristics of a SnO 2 -based ceramic varistor system doped additionally with Sb 2 O 5 , Cr 2 O 3 , and CoO. The specimens were prepared using conventional ceramic processing and homogenized by a high-energy ball milling system using the following composition: (98.99-X) % SnO 2 – 0.05% Cr 2 O 3 – 0.05% Sb 2 O 5 – 1.00% CoO – X% Mn 2 O 3 where X = 0.00, 0.05, 0.10, 0.20, 0.50 and 1% mol. Characterization by TG-DSC/DTA, XRD, XPS, and SEM/EDS, and the proposed chemical and defect-formation reactions allowed the conclusion that Mn 2 O 3 additions produce alterations of the microstructure consisting of the in situ formation of the spinel Co 2 MnO 4 secondary phase and modification of the potential barriers in the intergranular regions, where, in addition, oxygen vacancies are formed. With the 0.05 mol % Mn 2 O 3 , the grain size (average in the range of 2–3 μm) drops by 20 %, thus augmenting the grain boundaries. Altogether, this leads to a decrease in the nonlinearity coefficient (α) and an advantageous displacement of the breakdown electric field (E B). The 0.05 mol % Mn 2 O 3 specimen compares favorably with the reference material by surpassing the E B value by a factor of 8. Elucidation of Mn2+ and Co2+ in 1 mol % Mn 2 O 3 specimens by XPS suggests the role of MnO and CoO as intermediate phases, essential for Co 2 MnO 4 formation. The pathway for in situ formation of Co 2 MnO 4 is set forth based on the above characterization techniques in conjunction with proposed chemical and defect-formation reactions. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
