Effect of Fe incorporation on cation distributions and hopping conductions in Ni-Mn-Co-O spinel oxides

Han, HyukSu; Park, Kyoung Ryeol; Hong, Yu‐Rim; Shim, Kwang-Bo; Mhin, Sungwook

doi:10.1016/j.jallcom.2017.10.216

Cited by 44 publications

(27 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Negative temperature coefficient (NTC) ceramic thermistors based on mixed-valence transition manganites are being widely employed in temperature sensors, temperature controllers, time delay, voltage regulators and infrared detectors [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The electrical properties of spinel Mn3O4, doped with different transition metals (Co, Ni, Zn, Fe, Cu) cations, are mainly influenced by the Mn 3+ /Mn 4+ couple at B-sites and changed with dopant content [2,[4][5][6]8]. Moreover, a ternary spinel compound, i.e., (Mn3-x-yCoxNiy)O4(MCN), renders promising electrical properties due to simple fabrication and outstanding thermistors properties [9].…”

Section: Introductionmentioning

confidence: 99%

“…One should note that the electrical mechanism of MCN can be interpreted by small polaron hopping conduction [10]. Furthermore, the electrical properties of MCN can be tuned by doping small-sized transitions metals, such as Fe, Zn and Cu, at B-sites [2,8,11,12]. Hence, the substituent Sr, which is a divalent ion with a larger radius than Mn, facilitates the conversion of Mn 3+ to Mn 4+ and creates oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

“…Mn3+ and Mn 4+ ions at octahedral sites[2,11]. As mentioned above, the NTC thermistor characteristics are described by the Nernst-Einstein relationship:…”

mentioning

confidence: 99%

See 3 more Smart Citations

Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

Zhang

Thayil

et al. 2020

Preprint

View full text Add to dashboard Cite

Herein, the Mn1.95-xCo0.21Ni0.84SrxO4 (MCNS) (0 ≤ x ≤ 0.15) negative temperature coefficient (NTC) materials are prepared by co-precipitation method. The replacement of Mn by Sr plays a critical role in controlling the lattice parameter, relative density, microstructure and electrical properties. The lattice parameter and relatively density increase with the increase of Sr content. Moreover, a small amount of Sr retards the grain growth and increases the bulk density. Moreover, the ρ25, B25/50, Ea and α values of MCNS ceramics are influenced by the Sr content and ranged from 1535.0-2024.1 Ω•cm, 3654–3709 K, 0.3149–0.3197 eV and 4.111–4.173%, respectively. The XPS results explain the transformation of MCNS ceramics from n- to p-type semiconductors. Moreover, the aging coefficient (△R/R) of MCNS ceramics is found to be < 0.2%, which indicates the stable distribution of cations in the spinel. Finally, the MCNS ceramics demonstrate excellent thermal durability with < 1.3% of resistance shift after 100 thermal shock cycles.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Mn3+ and Mn 4+ ions at octahedral sites[2,11]. As mentioned above, the NTC thermistor characteristics are described by the Nernst-Einstein relationship:…”

mentioning

confidence: 99%

See 2 more Smart Citations

Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

Zhang

Thayil

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…the polarons hop between Mn 3+ and Mn 4+ ions in spinel manganite. The electrical properties of spinel thermistors are closely related to ionic distribution and even the fabrication process [1][2][3][4][5][6]. Sintering conditions such as sintering temperature and atmosphere have a close influence on the oxidation state of B-site cations in spinel and then a slight change of sintering conditions might affect the room-temperature resistivity (ρ 25 ) and temperature sensitivity [7].…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Wang

Yan

et al. 2020

PAC

View full text Add to dashboard Cite

Nb/Al-modified CuO ceramics (yNb/0.02Al-CuO, 0 ≤ y ≤ 0.07, denoted as NACO) were synthesized using sol-gel method for applications in negative temperature coefficient (NTC) thermistors. The phase structure, microstructure and electrical properties of the ceramics were investigated. XRD investigation reveals that the NACO ceramics has the main phase with monoclinic crystalline structure. The analysis of X-ray photoelectron spectroscopy proved the existence of Cu 2+ /Cu + and Nb 5+ /Nb 4+ ions. Temperature dependence of the resistivity indicated that the NACO ceramics present typical NTC characteristic. The NTC materials' constant, B value, can be adjusted from 2430 K to 3805 K by changing the Nb-concentration in the Al-doped CuO ceramics. Among four applied calibration equations the Hoge-3 equation is the most effective one for the resistancetemperature calibration of the prepared NTC thermistors. The complex impedance analysis was performed and revealed that both grain effect and grain boundary effect similarly contribute to the electrical conductive behaviour and NTC feature of the NACO ceramics. The band conduction and polaron hopping conduction are proposed as the conduction mechanisms in the NACO thermistors.

show abstract

Effect of Zn/Fe co-doping on the microstructure, electrical properties and aging behavior of Co–Mn–Ni–O NTC ceramics

et al. 2022

View full text Add to dashboard Cite

Effect of Fe incorporation on cation distributions and hopping conductions in Ni-Mn-Co-O spinel oxides

Cited by 44 publications

References 17 publications

Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

Enhanced aging and thermal shock performance of Mn1.95-xCo0.21Ni0.84SrxO4 NTC ceramics

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Effect of Zn/Fe co-doping on the microstructure, electrical properties and aging behavior of Co–Mn–Ni–O NTC ceramics

Contact Info

Product

Resources

About