Varistor and magnetic properties of nickel copper zinc niobium ferrite doped with Bi 2 O 3

Li Then Mei, Hsing-I Hsiang, Wei Hung Hsu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Bi 2 O 3 was added into nickel copper zinc niobium ferrite and treated with different thermal processes to change the grain-boundary chemical composition. The relationship between the grain-boundary composition and varistor properties were investigated using scanning electron microscopy, transmission electron microscopy, energy dispersion spectroscopy, and X-ray photoelectric spectroscopy. The experimental results show that Bi 2 O 3 reacts and diffuses into the spinel ferrite grain, forming bismuth iron compounds, causing the spinel ferrite chemical composition near grain boundary becomes iron deficient. The Fe deficiency spinel ferrite near the grain boundary then changes into p-type conduction. The annealing process after sintering improves the bismuth oxide diffusion and chemical reaction near the grain boundary, which can increase the grain-boundary resistivity. The n-type semiconductive grain interior and p-type spinel ferrite near the grain-boundary combination can form a double Schottky barrier, leading the specimen to exhibit varistor properties. A multifunctional varistor-magnetic material with a nonlinear coefficient of 10 and initial permeability of about 225 at 10 MHz can be successfully fabricated by sinteringNi 0.2881 Cu 0.1825 Zn 0.4802 Nb 0.0096 Fe 2.0168 O 4 ferrites added with 5 mol% Bi 2 O 3 sintered at 950°C, then annealed at 650°C for 1 h.

Original languageEnglish
Pages (from-to)3918-3925
Number of pages8
JournalJournal of the American Ceramic Society
Volume97
Issue number12
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Niobium
Varistors
Nickel
Ferrite
Zinc
Copper
Magnetic properties
Grain boundaries
Bismuth
Chemical analysis
Iron Compounds
Spectroscopy
Iron compounds
Ferrites
Magnetic materials
Chemical reactions
Sintering
Iron
Annealing
Transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

@article{6c7a91d8ac2643f9aefc9ee0bb80c9c9,
title = "Varistor and magnetic properties of nickel copper zinc niobium ferrite doped with Bi 2 O 3",
abstract = "Bi 2 O 3 was added into nickel copper zinc niobium ferrite and treated with different thermal processes to change the grain-boundary chemical composition. The relationship between the grain-boundary composition and varistor properties were investigated using scanning electron microscopy, transmission electron microscopy, energy dispersion spectroscopy, and X-ray photoelectric spectroscopy. The experimental results show that Bi 2 O 3 reacts and diffuses into the spinel ferrite grain, forming bismuth iron compounds, causing the spinel ferrite chemical composition near grain boundary becomes iron deficient. The Fe deficiency spinel ferrite near the grain boundary then changes into p-type conduction. The annealing process after sintering improves the bismuth oxide diffusion and chemical reaction near the grain boundary, which can increase the grain-boundary resistivity. The n-type semiconductive grain interior and p-type spinel ferrite near the grain-boundary combination can form a double Schottky barrier, leading the specimen to exhibit varistor properties. A multifunctional varistor-magnetic material with a nonlinear coefficient of 10 and initial permeability of about 225 at 10 MHz can be successfully fabricated by sinteringNi 0.2881 Cu 0.1825 Zn 0.4802 Nb 0.0096 Fe 2.0168 O 4 ferrites added with 5 mol{\%} Bi 2 O 3 sintered at 950°C, then annealed at 650°C for 1 h.",
author = "Mei, {Li Then} and Hsing-I Hsiang and Hsu, {Wei Hung}",
year = "2014",
month = "1",
day = "1",
doi = "10.1111/jace.13243",
language = "English",
volume = "97",
pages = "3918--3925",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "12",

}

Varistor and magnetic properties of nickel copper zinc niobium ferrite doped with Bi 2 O 3 . / Mei, Li Then; Hsiang, Hsing-I; Hsu, Wei Hung.

In: Journal of the American Ceramic Society, Vol. 97, No. 12, 01.01.2014, p. 3918-3925.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Varistor and magnetic properties of nickel copper zinc niobium ferrite doped with Bi 2 O 3

AU - Mei, Li Then

AU - Hsiang, Hsing-I

AU - Hsu, Wei Hung

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Bi 2 O 3 was added into nickel copper zinc niobium ferrite and treated with different thermal processes to change the grain-boundary chemical composition. The relationship between the grain-boundary composition and varistor properties were investigated using scanning electron microscopy, transmission electron microscopy, energy dispersion spectroscopy, and X-ray photoelectric spectroscopy. The experimental results show that Bi 2 O 3 reacts and diffuses into the spinel ferrite grain, forming bismuth iron compounds, causing the spinel ferrite chemical composition near grain boundary becomes iron deficient. The Fe deficiency spinel ferrite near the grain boundary then changes into p-type conduction. The annealing process after sintering improves the bismuth oxide diffusion and chemical reaction near the grain boundary, which can increase the grain-boundary resistivity. The n-type semiconductive grain interior and p-type spinel ferrite near the grain-boundary combination can form a double Schottky barrier, leading the specimen to exhibit varistor properties. A multifunctional varistor-magnetic material with a nonlinear coefficient of 10 and initial permeability of about 225 at 10 MHz can be successfully fabricated by sinteringNi 0.2881 Cu 0.1825 Zn 0.4802 Nb 0.0096 Fe 2.0168 O 4 ferrites added with 5 mol% Bi 2 O 3 sintered at 950°C, then annealed at 650°C for 1 h.

AB - Bi 2 O 3 was added into nickel copper zinc niobium ferrite and treated with different thermal processes to change the grain-boundary chemical composition. The relationship between the grain-boundary composition and varistor properties were investigated using scanning electron microscopy, transmission electron microscopy, energy dispersion spectroscopy, and X-ray photoelectric spectroscopy. The experimental results show that Bi 2 O 3 reacts and diffuses into the spinel ferrite grain, forming bismuth iron compounds, causing the spinel ferrite chemical composition near grain boundary becomes iron deficient. The Fe deficiency spinel ferrite near the grain boundary then changes into p-type conduction. The annealing process after sintering improves the bismuth oxide diffusion and chemical reaction near the grain boundary, which can increase the grain-boundary resistivity. The n-type semiconductive grain interior and p-type spinel ferrite near the grain-boundary combination can form a double Schottky barrier, leading the specimen to exhibit varistor properties. A multifunctional varistor-magnetic material with a nonlinear coefficient of 10 and initial permeability of about 225 at 10 MHz can be successfully fabricated by sinteringNi 0.2881 Cu 0.1825 Zn 0.4802 Nb 0.0096 Fe 2.0168 O 4 ferrites added with 5 mol% Bi 2 O 3 sintered at 950°C, then annealed at 650°C for 1 h.

UR - http://www.scopus.com/inward/record.url?scp=84915788685&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84915788685&partnerID=8YFLogxK

U2 - 10.1111/jace.13243

DO - 10.1111/jace.13243

M3 - Article

AN - SCOPUS:84915788685

VL - 97

SP - 3918

EP - 3925

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 12

ER -