A lithium-iron-doped nickel oxide negative temperature coefficient thermistor material
A technology of negative temperature coefficient and thermistor, which is applied in the direction of resistors with negative temperature coefficient, resistors, non-adjustable metal resistors, etc., can solve problems such as structural relaxation, material aging, and composition affecting accuracy, and achieve material The effect of simple composition, high performance stability and low sintering temperature
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Embodiment 1
[0019] This embodiment according to the molecular formula Ni 1-x-y Li x Fe y O was dosed where x=0.04, y=0. The initial raw material is selected from basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, lithium carbonate Li 2 CO 3 . Materials were prepared according to the following experimental process steps:
[0020] (1) The initial raw material is Ni 0.96 Li 0.04 O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O 24.0787g, Li 2 CO 3 0.2956g;
[0021] (2) the raw material taken in the previous step is dissolved in dilute nitric acid;
[0022] (3) The solution prepared in the previous step is stirred and mixed evenly with a magnetic stirring heater, heated and dried;
[0023] (4) Calcining the powder obtained in the previous step at a temperature of 850° C. and keeping it warm for 5 hours;
[0024] (5) The powder synthesized in the previous step is granulated and pressed into a green body; the green body is a disc shape, the diameter of the disc is 15 mm, and ...
Embodiment 2
[0030] This embodiment according to the molecular formula Ni 1-x-y Li x Fe y O was dosed where x=0.04, y=0.03. The initial raw material is selected from basic nickel carbonate NiCO 3 2Ni(OH) 2 4H 2 O, lithium carbonate Li 2 CO 3 , ferric citrate-hydrated FeC 6 h 5 o 7 ·nH 2 O. Materials were prepared according to the following experimental process steps:
[0031] (1) The initial raw material is Ni 0.93 Li 0.04 Fe 0.03 O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O23.3262g, Li 2 CO 3 0.2956g, FeC 6 h 5 o 7 ·nH 2 O 1.4698g;
[0032] (2) The raw material NiCO taken in the previous step 3 2Ni(OH) 2 4H 2 O and Li 2 CO 3 Soluble in dilute nitric acid; FeC 6 h 5 o 7 ·nH 2 O is heated and dissolved in deionized water.
[0033] (3) Mix the two solutions prepared in the previous step together, stir and mix evenly with a magnetic stirring heater, and heat and dry.
[0034] (4) The preparation process is the same as steps (4)-(8) in Example 1.
...
Embodiment 3
[0037] This example according to molecular formula Ni 1-x-y Li x Fe y O was dosed where x=0.04, y=0.04. Basic nickel carbonate NiCO is selected as the initial raw material 3 2Ni(OH) 2 4H 2 O, lithium carbonate Li 2 CO 3 , ferric citrate-hydrated FeC 6 h 5 o 7 ·nH 2 O. Materials were prepared according to the following experimental process steps:
[0038] (1) The initial raw material is Ni 1-x-y Li x Fe y O formula ingredients, weigh NiCO 3 2Ni(OH) 2 4H 2 O23.0754g, Li 2 CO 3 0.2956g, FeC 6 h 5 o 7 ·nH 2 O 1.9596g;
[0039] (2) The preparation process is the same as steps (2)-(4) in Example 2.
[0040] The properties of the prepared materials are shown in Table 1. figure 1 and figure 2 shown.
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