Cold sintering of nickel manganese oxide for thermistor fabrication

Julian Fanghanel; Satoshi Yokomizo; Shuichi Funahashi; Clive A. Randall

doi:10.1039/d4ta06380e

Cold sintering of nickel manganese oxide for thermistor fabrication

Julian Fanghanel, Satoshi Yokomizo, Shuichi Funahashi, Clive A. Randall

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Abstract

In this paper we successfully densified NiMn₂O₄ (NMO) ceramics using the cold sintering process (CSP) with various molten salt fluxes as a transient liquid phase, achieving relative densities exceeding 95%. The resulting samples exhibited comparable properties to conventionally sintered counterparts, demonstrating the feasibility of the CSP for NMO thermistor production. Electrical characterization revealed NMO samples sintered via CSP exhibited negative temperature coefficient (NTC) behavior with material constants (B) and temperature coefficients of resistivity (α) akin to conventionally sintered materials in the range of 3500-4300 K and 0.04-0.05 K⁻¹. Despite slightly higher resistances attributed to differences in grain size and impurities, the CSP-produced NMO samples remained within the typical range for NTC thermistors.

Original language	English (US)
Pages (from-to)	33984-33990
Number of pages	7
Journal	Journal of Materials Chemistry A
Volume	12
Issue number	48
DOIs	https://doi.org/10.1039/d4ta06380e
State	Published - Nov 14 2024

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General Chemistry
Renewable Energy, Sustainability and the Environment
General Materials Science

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10.1039/d4ta06380e

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title = "Cold sintering of nickel manganese oxide for thermistor fabrication",

abstract = "In this paper we successfully densified NiMn2O4 (NMO) ceramics using the cold sintering process (CSP) with various molten salt fluxes as a transient liquid phase, achieving relative densities exceeding 95%. The resulting samples exhibited comparable properties to conventionally sintered counterparts, demonstrating the feasibility of the CSP for NMO thermistor production. Electrical characterization revealed NMO samples sintered via CSP exhibited negative temperature coefficient (NTC) behavior with material constants (B) and temperature coefficients of resistivity (α) akin to conventionally sintered materials in the range of 3500-4300 K and 0.04-0.05 K−1. Despite slightly higher resistances attributed to differences in grain size and impurities, the CSP-produced NMO samples remained within the typical range for NTC thermistors.",

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T1 - Cold sintering of nickel manganese oxide for thermistor fabrication

AU - Fanghanel, Julian

AU - Yokomizo, Satoshi

AU - Funahashi, Shuichi

AU - Randall, Clive A.

PY - 2024/11/14

Y1 - 2024/11/14

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AB - In this paper we successfully densified NiMn2O4 (NMO) ceramics using the cold sintering process (CSP) with various molten salt fluxes as a transient liquid phase, achieving relative densities exceeding 95%. The resulting samples exhibited comparable properties to conventionally sintered counterparts, demonstrating the feasibility of the CSP for NMO thermistor production. Electrical characterization revealed NMO samples sintered via CSP exhibited negative temperature coefficient (NTC) behavior with material constants (B) and temperature coefficients of resistivity (α) akin to conventionally sintered materials in the range of 3500-4300 K and 0.04-0.05 K−1. Despite slightly higher resistances attributed to differences in grain size and impurities, the CSP-produced NMO samples remained within the typical range for NTC thermistors.

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Cold sintering of nickel manganese oxide for thermistor fabrication

Abstract

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