Ageing behavior of electrical resistance in manganite NTC ceramics

Vakiv, M.; Shpotyuk, O.; Balitska, V.; Butkiewicz, Bohdan S.; Shpotyuk, Lyubov

doi:10.1016/s0955-2219(03)00377-7

Cited by 34 publications

(26 citation statements)

References 7 publications

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“…It is known that conductive material penetrating spinel ceramics reduces electrical resistivity, thus resulting in negative RRD for such thick-film systems [10,11]. This diffusive-related process is strongly thermally-activated, in contrast to own structural changes occurring in ceramics body, which produces rather positive feedback in the RRD due to increased defectiveness of spinel matrix [14]. The negative RRD quickly saturates with conductive material penetrating into ceramics as it character for thick films of Cu 0.1 Ni 0.1 Co 1.6 Mn 1.2 O 4 spinel supplied by conductive Ag-Pd alloy contacts.…”

Section: Resultsmentioning

confidence: 99%

“…The starting ceramics were synthesized by sintering route (1040 o C, 4 h duration) using reagent grade Cu carbonate hydroxide, and Ni, Co, Mn carbonate hydroxide hydrates [12][13][14]. The paste was prepared by mixing powder of basic Cu 0.1 Ni 0.1 Co 1.6 Mn 1.2 O 4 ceramics with МБ-60 glass, Bi 2 O 3 (used as inorganic binder) and some organic vehicle.…”

Section: Nanoinhomogeneous Ceramics Preparationmentioning

confidence: 99%

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Kinetics models describing degradation-relaxation effects in nanoinhomogeneous substances

Shpotyuk

Balitska

Brunner

2017

J. Phys.: Conf. Ser.

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Abstract. The mathematical models of degradation-relaxation kinetics are considered for jammed systems composed of screen-printed spinel Cu 0.1 Ni 0.1 Co 1.6 Mn 1.2 O 4 and conductive Ag or Ag-Pd alloys. Structurally-intrinsic nanoinhomogeneities due to Ag and Ag-Pd diffusants embedded in spinel phase environment are shown to define governing kinetics of thermally-induced degradation obeying an obvious non-exponential behaviour in the resistance drift. The stretched-to-compressed exponential crossover is detected for degradation-relaxation kinetics in these systems with conductive contacts made of Ag-Pd and Ag alloys. Under essential migration of conductive phase, the resulting kinetics is though to be considerable twostep diffusing process originated from Ag penetration deep into spinel ceramics. IntroductionThe jammed systems prepared from high-temperature state by so-called fluid-to-solid transition compose an important class of substances for practical using [1]. Being quenched in far-fromequilibrium configuration, these materials demonstrate response on different degradation-relaxation inputs, tending towards equilibrium in the controlled parameter N(t) through compressed-exponential relaxation (CER) kinetics (super-exponential, i.e. faster than simple exponential decay):

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Section: Resultsmentioning

confidence: 99%

Section: Nanoinhomogeneous Ceramics Preparationmentioning

confidence: 99%

Kinetics models describing degradation-relaxation effects in nanoinhomogeneous substances

Shpotyuk

Balitska

Brunner

2017

J. Phys.: Conf. Ser.

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“…To meet this high demand, the thermistor specification should be modified with more emphasis on the reliability of the composition. The aging coefficient of the NTC thermistors is characterized by the relative variation (R − R 0 )/R 0 × 100 %, in which R 0 is the resistance value at 20 K before aging, and R is the resistance value at 20 K after aging [8,[17][18][19][20]. The aging coefficient shows the long-term reliability of NTC thermistors.…”

Section: Aging Of Thermistorsmentioning

confidence: 99%

Construction and Characterization of NTC Thermistors at Low Temperature

Yu-qi

Yu²,

Chen

et al. 2010

Int J Thermophys

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Nano-powder of a negative temperature coefficient (NTC) ceramic with a spinel structure of Mn-Ni-Cu-Co-La-O composition was prepared by the Pechini method. A type of NTC thermistor sensor (3.0 mm diameter × 1.5 mm high) was designed by the in situ lead wire attachment method (ISAM) and made using the synthesized powder. NTC thermistors were packed in the glass-sealed package. Six independent NTC thermistors were calibrated using a cryostat, a standard platinum resistance thermometer, and a Fluke 1590 super thermometer meter over the temperature range from 18 K to 120 K. The data were interpolated to obtain calibration tables at 2 K intervals from 18 K to 30 K, and at 5 K intervals from 30 K to 120 K. These tables were fitted with the equation:Aging, thermometric characteristics, fitting of calibrated data, stability of NTC thermistors, and the effect of a magnetic field on NTC thermistors were investigated.

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“…]/ [Mn 4? ] ions in the octahedral sites [7], resulting in cationic migrations and electronic changes between the sublattices of the spinel structure [8,9]. It was necessary to investigate the nature of their semiconductivity and the influence of impurities/dopants and heat treatments on their electrical characteristics, particularly aging.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mg substitution on microstructure and electrical properties of Mn1.25Ni0.75Co1.0−x Mg x O4(0 ≤ x ≤ 1) NTC ceramics

Peng

Zhang

Chang

et al. 2011

J Mater Sci: Mater Electron

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The NTC thermistors based on spinel-type semiconducting electroceramics with compositions Mn 1.25 Ni 0.75 Co 1.0-x Mg x O 4 (0 B x B 1) were synthesized by solid-state method. The influences of Mg content on the Mn 1.25 Ni 0.75 Co 1.0-x Mg x O 4 materials were investigated by laser particle size analyzer, XRD, SEM, EDS and electrical measurements, respectively. The experiment results show that the substituted Mg suppresses the separation of NiO phase. Both the grain size and density decrease as the amount of Mg content in Mn 1.25 Ni 0.75 Co 1.0-x Mg x O 4 samples increases. In particular, the substituted Mg leads to a decrease in the resistance drift of the Mn 1.25 Ni 0.75 Co 1.0-x Mg x O 4 NTC ceramics after aging test. This indicates that the Mg substituted Mn 1.25 Ni 0.75 Co 1.0-x Mg x O 4 NTC ceramics display high electrical stability in comparison with the Mg-free Mn 1.25 Ni 0.75 Co 1.0 O 4 ceramics.

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Ageing behavior of electrical resistance in manganite NTC ceramics

Cited by 34 publications

References 7 publications

Kinetics models describing degradation-relaxation effects in nanoinhomogeneous substances

Kinetics models describing degradation-relaxation effects in nanoinhomogeneous substances

Construction and Characterization of NTC Thermistors at Low Temperature

Effect of Mg substitution on microstructure and electrical properties of Mn1.25Ni0.75Co1.0−x Mg x O4(0 ≤ x ≤ 1) NTC ceramics

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