Direct synthesis of varistor-grade doped nanocrystalline ZnO and its densification through a step-sintering technique

S. Anas; R. V. Mangalaraja; Mukundan Poothayal; Sanjeev K. Shukla; S. Ananthakumar

doi:10.1016/j.actamat.2007.06.047

Direct synthesis of varistor-grade doped nanocrystalline ZnO and its densification through a step-sintering technique

S. Anas, R. V. Mangalaraja, Mukundan Poothayal, Sanjeev K. Shukla, S. Ananthakumar

Research output: Contribution to journal › Article › peer-review

72 Scopus citations

Abstract

A direct synthesis of varistor-grade doped ZnO powder was attempted by simple hydrolysis followed by low-temperature refluxing (80 °C) in aqueous and alcoholic media. Rod like, one-dimensional nanocrystalline doped ZnO powders with crystallite size 24 nm and Brunauer-Emmett-Teller (BET) bulk surface area 22 m² g^-1 were synthesized. Sintering characteristics of these powders were analyzed under step-sintering coupled with rapid heating up to 1050 °C. The microstructural features and I-V characteristics of the step-sintered doped ZnO were compared with composite varistors. The study shows the advantage of the addition of nanosize doped varistor-grade ZnO as well as step-sintering for controlling grain size and improving varistor performance.

Original language	English
Pages (from-to)	5792-5801
Number of pages	10
Journal	Acta Materialia
Volume	55
Issue number	17
DOIs	https://doi.org/10.1016/j.actamat.2007.06.047
State	Published - Oct 2007
Externally published	Yes

Keywords

Composite varistors
Direct synthesis
Doped zinc oxide
Reflux
Step-sintering

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10.1016/j.actamat.2007.06.047

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title = "Direct synthesis of varistor-grade doped nanocrystalline ZnO and its densification through a step-sintering technique",

abstract = "A direct synthesis of varistor-grade doped ZnO powder was attempted by simple hydrolysis followed by low-temperature refluxing (80 °C) in aqueous and alcoholic media. Rod like, one-dimensional nanocrystalline doped ZnO powders with crystallite size 24 nm and Brunauer-Emmett-Teller (BET) bulk surface area 22 m2 g-1 were synthesized. Sintering characteristics of these powders were analyzed under step-sintering coupled with rapid heating up to 1050 °C. The microstructural features and I-V characteristics of the step-sintered doped ZnO were compared with composite varistors. The study shows the advantage of the addition of nanosize doped varistor-grade ZnO as well as step-sintering for controlling grain size and improving varistor performance.",

keywords = "Composite varistors, Direct synthesis, Doped zinc oxide, Reflux, Step-sintering",

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AU - Anas, S.

AU - Mangalaraja, R. V.

AU - Poothayal, Mukundan

AU - Shukla, Sanjeev K.

AU - Ananthakumar, S.

PY - 2007/10

Y1 - 2007/10

N2 - A direct synthesis of varistor-grade doped ZnO powder was attempted by simple hydrolysis followed by low-temperature refluxing (80 °C) in aqueous and alcoholic media. Rod like, one-dimensional nanocrystalline doped ZnO powders with crystallite size 24 nm and Brunauer-Emmett-Teller (BET) bulk surface area 22 m2 g-1 were synthesized. Sintering characteristics of these powders were analyzed under step-sintering coupled with rapid heating up to 1050 °C. The microstructural features and I-V characteristics of the step-sintered doped ZnO were compared with composite varistors. The study shows the advantage of the addition of nanosize doped varistor-grade ZnO as well as step-sintering for controlling grain size and improving varistor performance.

AB - A direct synthesis of varistor-grade doped ZnO powder was attempted by simple hydrolysis followed by low-temperature refluxing (80 °C) in aqueous and alcoholic media. Rod like, one-dimensional nanocrystalline doped ZnO powders with crystallite size 24 nm and Brunauer-Emmett-Teller (BET) bulk surface area 22 m2 g-1 were synthesized. Sintering characteristics of these powders were analyzed under step-sintering coupled with rapid heating up to 1050 °C. The microstructural features and I-V characteristics of the step-sintered doped ZnO were compared with composite varistors. The study shows the advantage of the addition of nanosize doped varistor-grade ZnO as well as step-sintering for controlling grain size and improving varistor performance.

KW - Composite varistors

KW - Direct synthesis

KW - Doped zinc oxide

KW - Reflux

KW - Step-sintering

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JO - Acta Materialia

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ER -

Direct synthesis of varistor-grade doped nanocrystalline ZnO and its densification through a step-sintering technique

Abstract

Keywords

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