Structure and electrical properties characterization of NiMn2O4 NTC ceramics

Acharya, Nayana; Sagar, Raghavendra

doi:10.1016/j.inoche.2021.108856

Cited by 28 publications

(5 citation statements)

References 37 publications

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“…Co-precipitation is one of the simple and cost-effective approaches mainly employed caused by producing a uniform and high purity ceramic oxides along with ease of adjusting experimental parameters. 20,21 On the other hand, the mechanical mixing method has some benets like simplicity, exibility, and unit operation. 22 As a result, introducing a MnMoO 4 / MWCNT electrode material with a simple technique could prociently enhance the energy storage properties of the MnMoO 4 with a simple synthesizing process enhancing its most common drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of manganese molybdate/MWCNT nanostructure composite with a simple approach for supercapacitor applications

2022

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Section: Introductionmentioning

confidence: 99%

Synthesis of manganese molybdate/MWCNT nanostructure composite with a simple approach for supercapacitor applications

2022

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“…From table 2, it can be seen that the approximated value of E a is ∼0.37 eV. However, there is a slight increase in the value of E a at higher calcined temperatures which could be due to the increment in particle/crystallite size [25,26]. To calculate d.c. resistance (R dc ), V-I curves for all samples are recorded at RT from the potential window of −10.0 V to −10.0 V as shown in figure 9(f).…”

Section: DC Conductivitymentioning

confidence: 99%

Tuning the electrical and cycling performance of nickel manganese oxide hexagonal-shaped particles via preparation routes for lithium-ion batteries

Jain¹,

Panwar²,

Tyagi³

2023

J. Phys. D: Appl. Phys.

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In this study, simple and effective solid-state and sol-gel routes are attempted to synthesize Nickel Manganese Oxide, NiMn2O4 (NMO). Structural, morphological, electrical, and electrochemical properties are investigated with calcination temperatures. XRD results confirm the highly crystalline cubic spinel structure with zero impurities for all samples, except NMOS_700, which indicates the presence of a slight NiMnO3 phase. SEM and TEM micrographs confirm the formation of hexagonal shape particles of size less than <0.5μm. At low calcination temperatures, grouped and uneven-shaped particles are observed with increased particle size. Electrical measurements depict the strong dependence of conductivities (σac and σdc) on grain size, grain boundary, and operating temperature. All the samples exhibit conductivities between 10-8 - 10-4 S/cm with the varied calcination temperature. Electrochemical performances are explored via Electrochemical Impedance Spectroscopy (EIS), Cyclic Voltammetry (CV), and Galvanostatic Charge-Discharge (GCD) profiles. Sample NMOB_700 and NMOB_800 exhibit the initial discharging capacity of 1104 and 1188 mAh g-1 at 100 mA g-1 current density. All the samples exhibit above 98% columbic efficiency after two initial cycles and show the reversible nature of NiMn2O4 and excellent cyclability. The electrochemical results confirm that preparation methods and calcination temperature have a great impact on the grain properties of materials. Multiple oxidation states of Mn and Ni is also confirmed through the XPS study.

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“…The semiconductive oxides used in the production of low temperature application range NTC thermistors are based on nickel manganese spinel and its modifications such as NiMn 2 O 4 , (NiMn) 3 O 4 , (NiMnCo) 3 O 4 , (NiMnFeCo) 3 O 4 , and (Fe,Ti) 2 O 3 . They are usually doped by a low percentage of oxides such as CuO, ZnO, CoO, LiO, RuO 2, ZrO 2 , Y 2 O 3 , and other oxides to form complex thermistor materials [ 9 , 10 , 11 , 12 , 13 , 14 ]. The nickel manganese spinel is partly inverse as the tetrahedral ion Ni 2+ and octahedral ion Mn 3+ can exchange their sites in the lattice.…”

Section: Introductionmentioning

confidence: 99%

Thermally Coupled NTC Chip Thermistors: Their Properties and Applications

Bodić,

Aleksić,

Rajs

et al. 2024

Sensors

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Negative temperature coefficient (NTC) chip thermistors were thermally coupled to form a novel device (TCCT) aimed for application in microelectronics. It consists of two NTC chip thermistors Th1 and Th2, which are small in size (0603) and power (1/10 W). They are in thermal junction, but concurrently they are electrically isolated. The first thermistor Th1 generates heat as a self-heating component at a constant supply voltage U (input thermistor), while the second thermistor Th2 receives heat as a passive component (output thermistor). The temperature dependence R(T) of NTC chip thermistors was measured in the climatic test chamber, and the exponential factor B10/30 of thermistor resistance was determined. After that, a self–heating current I1 of the input thermistor was measured vs. supply voltage U and ambient temperature Ta as a parameter. Input resistance R1 was determined as a ratio of U and I1 while output thermistor resistance R2 was measured by a multimeter concurrently with the current I1. Temperatures T1 and T2 of both thermistors were determined using the Steinhart–Hart equation. Heat transfer, thermal response, stability, and inaccuracy were analyzed. The application of thermally coupled NTC chip thermistors is expected in microelectronics for the input to output electrical decoupling/thermal coupling of slow changeable signals.

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Structure and electrical properties characterization of NiMn2O4 NTC ceramics

Cited by 28 publications

References 37 publications

Synthesis of manganese molybdate/MWCNT nanostructure composite with a simple approach for supercapacitor applications

Synthesis of manganese molybdate/MWCNT nanostructure composite with a simple approach for supercapacitor applications

Tuning the electrical and cycling performance of nickel manganese oxide hexagonal-shaped particles via preparation routes for lithium-ion batteries

Thermally Coupled NTC Chip Thermistors: Their Properties and Applications

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