Aging Phenomena in Cu&lt;sub&gt;0.1&lt;/sub&gt;Ni&lt;sub&gt;0.8&lt;/sub&gt;Co&lt;sub&gt;0.2&lt;/sub&gt;Mn&lt;sub&gt;1.9&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; NTC Ceramics

Shpotyuk, O.; Vakiv, M.; Mrooz, O.; Hadzaman, I.; Plewa, J.; Uphoff, H.; Altenburg, H.

doi:10.4028/www.scientific.net/kem.206-213.1317

Cited by 2 publications

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“…[4] In stable ceramic polycrystalline materials a distribution Ds of relaxation times s (= q dc c) in the sample may be the most plausible explanation. [18] In fact, the parameters q dc and c may both display independent distributions.…”

Section: Solid State Impedance Spectroscopymentioning

confidence: 99%

“…The reasons for non-Debye response are difficult to determine, and a variety of causes have been suggested. [4] In stable ceramic polycrystalline materials a distribution of relaxation times ∆τ (τ = ρ dc •c) in the sample may be the most plausible explanation. [18] In fact, the parameters ρ dc and c may both display independent distributions.…”

Section: Solid State Impedance Spectroscopymentioning

confidence: 99%

“…Spinel type manganates are high technology electroceramic materials, which are commonly used in a wide range of thermistor and related applications. [1] Historically, the compound NiMn 2 O 4 has been the basis of NTCR thermistor developments, [2] but nowadays a wide range of dopants are commonly included into the system to increase stability, [3] reduce ageing effects [4] or tune the NTCR thermistor parameters. [5] The key material property relevant for thermistor applications is the resistivity vs temperature (ρ -T ) behaviour.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Studies of the Temperature and Frequency Dependent Impedance of an Electroceramic Functional Oxide NTC Thermistor

Schmidt

Brinkman

2007

Adv Funct Materials

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The charge transport mechanism and the macroscopic dielectric constant in polycrystalline device materials commonly exhibit several components such as electrode-sample interface, grain boundary and bulk contributions. In order to gain precise understanding of the functionality of polycrystalline electroceramic device materials it is essential to deconvolute these contributions.The paradigm of functional thermistor ceramics based on thick film spinel manganates has been studied by temperature dependent alternating current impedance spectroscopy. Three typical relaxation phenomena were detected, which all showed a separated temperature dependence of resistivity consistent with thermally activated charge transport. The dominating grain boundary and the interface contributions exhibited distinctively different capacitance allowing clear identification. The composite nature of the dielectric properties in polycrystalline functional ceramics was emphasized, and impedance spectroscopy was shown to be a powerful tool to account for and model such behaviour.

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Section: Solid State Impedance Spectroscopymentioning

confidence: 99%

Section: Solid State Impedance Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Studies of the Temperature and Frequency Dependent Impedance of an Electroceramic Functional Oxide NTC Thermistor

Schmidt

Brinkman

2007

Adv Funct Materials

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Synthesis, Phase Characterization, and Properties of Chemical Solution‐Deposited Nickel Manganite Thermistor Thin Films

Schulze

Dickey

et al. 2009

Journal of the American Ceramic Society

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Nickel manganite spinel thin films prepared by chemical solution deposition exhibit negative temperature coefficient of resistance (TCR) values between −3.3 and −4.5%/K. In contrast to bulk thermistors, dense films could be prepared completely within the spinel phase field. Thus, decomposition into the NiO phase and a Mn‐rich spinel, which is problematic in bulk ceramics, is minimized in thin films. For films prepared outside of the single‐phase field, phase separation cannot always be detected using X‐ray diffraction. In such cases, transmission electron microscopy is useful in identifying decomposition. It is found that the lattice parameters for films with compositions ranging between Mn/(Mn+Ni)=0.14 and 0.77 are smaller than the values reported for nickel manganite spinels, suggesting cation deficiency. Single‐phase spinel films are compared with single‐phase bixbyite films synthesized between 630° and 930°C. The bixbyite phase exhibits lower TCR and lower resistivity (TCR=−3.1 to −3.3%/K and resistivity values=400–1600 Ω·cm) compared with spinel (TCR=−3.6 to −4.1%/K and resistivity values=3500–21 000 Ω·cm). Composite films (achieved by controlling the pyrolysis to create a low local pO2 during annealing) show intermediate values (TCR=−3.0 to −3.8%/K and resistivity values=470–6600 Ω·cm).

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Aging Phenomena in Cu<sub>0.1</sub>Ni<sub>0.8</sub>Co<sub>0.2</sub>Mn<sub>1.9</sub>O<sub>4</sub> NTC Ceramics

Cited by 2 publications

References 0 publications

Studies of the Temperature and Frequency Dependent Impedance of an Electroceramic Functional Oxide NTC Thermistor

Studies of the Temperature and Frequency Dependent Impedance of an Electroceramic Functional Oxide NTC Thermistor

Synthesis, Phase Characterization, and Properties of Chemical Solution‐Deposited Nickel Manganite Thermistor Thin Films

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