Cold sintering with dimethyl sulfoxide solutions for metal oxides

Xiaoyu Kang, Richard Floyd, Sarah Lowum, Daniel Long, Elizabeth Dickey, Jon-Paul Maria

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Cold sintering of ZnO and MnO with dimethyl sulfoxide (DMSO)-based solutions is demonstrated. For ZnO ceramics, density values approach 99% theoretical when cold-sintered at 180 °C with DMSO-HOAc and DMSO-Zn(OAc) 2 solutions. MnO densified with aqueous HOAc solutions produces ceramics of 84% theoretical density that contain significant amounts of Mn(OH) 2 secondary phases. In comparison, using DMSO-HOAc solutions produces density values of 94% theoretical at 250 °C with trace quantities of Mn 3 O 4 , verified via X-ray diffraction. Scanning electron microscope analysis of sample fracture surfaces containing Mn 3 O 4 reveals numerous crystallites smaller than 100 nm that nucleate on or between the considerably larger starting MnO grains. With increasing temperature, these precipitates appear to coalesce and fill the porosity that remains after initial compaction. These results identify an avenue to cold sinter metal oxides that, in the presence of aqueous media, favor hydroxide formation which inhibits further densification.

Original languageEnglish (US)
Pages (from-to)7438-7446
Number of pages9
JournalJournal of Materials Science
Volume54
Issue number10
DOIs
StatePublished - May 30 2019

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Dimethyl sulfoxide
Dimethyl Sulfoxide
Oxides
Sintering
Metals
Densification
Crystallites
Precipitates
Compaction
Electron microscopes
Porosity
Scanning
X ray diffraction
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Kang, Xiaoyu ; Floyd, Richard ; Lowum, Sarah ; Long, Daniel ; Dickey, Elizabeth ; Maria, Jon-Paul. / Cold sintering with dimethyl sulfoxide solutions for metal oxides. In: Journal of Materials Science. 2019 ; Vol. 54, No. 10. pp. 7438-7446.
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abstract = "Cold sintering of ZnO and MnO with dimethyl sulfoxide (DMSO)-based solutions is demonstrated. For ZnO ceramics, density values approach 99{\%} theoretical when cold-sintered at 180 °C with DMSO-HOAc and DMSO-Zn(OAc) 2 solutions. MnO densified with aqueous HOAc solutions produces ceramics of 84{\%} theoretical density that contain significant amounts of Mn(OH) 2 secondary phases. In comparison, using DMSO-HOAc solutions produces density values of 94{\%} theoretical at 250 °C with trace quantities of Mn 3 O 4 , verified via X-ray diffraction. Scanning electron microscope analysis of sample fracture surfaces containing Mn 3 O 4 reveals numerous crystallites smaller than 100 nm that nucleate on or between the considerably larger starting MnO grains. With increasing temperature, these precipitates appear to coalesce and fill the porosity that remains after initial compaction. These results identify an avenue to cold sinter metal oxides that, in the presence of aqueous media, favor hydroxide formation which inhibits further densification.",
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Cold sintering with dimethyl sulfoxide solutions for metal oxides. / Kang, Xiaoyu; Floyd, Richard; Lowum, Sarah; Long, Daniel; Dickey, Elizabeth; Maria, Jon-Paul.

In: Journal of Materials Science, Vol. 54, No. 10, 30.05.2019, p. 7438-7446.

Research output: Contribution to journalArticle

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T1 - Cold sintering with dimethyl sulfoxide solutions for metal oxides

AU - Kang, Xiaoyu

AU - Floyd, Richard

AU - Lowum, Sarah

AU - Long, Daniel

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N2 - Cold sintering of ZnO and MnO with dimethyl sulfoxide (DMSO)-based solutions is demonstrated. For ZnO ceramics, density values approach 99% theoretical when cold-sintered at 180 °C with DMSO-HOAc and DMSO-Zn(OAc) 2 solutions. MnO densified with aqueous HOAc solutions produces ceramics of 84% theoretical density that contain significant amounts of Mn(OH) 2 secondary phases. In comparison, using DMSO-HOAc solutions produces density values of 94% theoretical at 250 °C with trace quantities of Mn 3 O 4 , verified via X-ray diffraction. Scanning electron microscope analysis of sample fracture surfaces containing Mn 3 O 4 reveals numerous crystallites smaller than 100 nm that nucleate on or between the considerably larger starting MnO grains. With increasing temperature, these precipitates appear to coalesce and fill the porosity that remains after initial compaction. These results identify an avenue to cold sinter metal oxides that, in the presence of aqueous media, favor hydroxide formation which inhibits further densification.

AB - Cold sintering of ZnO and MnO with dimethyl sulfoxide (DMSO)-based solutions is demonstrated. For ZnO ceramics, density values approach 99% theoretical when cold-sintered at 180 °C with DMSO-HOAc and DMSO-Zn(OAc) 2 solutions. MnO densified with aqueous HOAc solutions produces ceramics of 84% theoretical density that contain significant amounts of Mn(OH) 2 secondary phases. In comparison, using DMSO-HOAc solutions produces density values of 94% theoretical at 250 °C with trace quantities of Mn 3 O 4 , verified via X-ray diffraction. Scanning electron microscope analysis of sample fracture surfaces containing Mn 3 O 4 reveals numerous crystallites smaller than 100 nm that nucleate on or between the considerably larger starting MnO grains. With increasing temperature, these precipitates appear to coalesce and fill the porosity that remains after initial compaction. These results identify an avenue to cold sinter metal oxides that, in the presence of aqueous media, favor hydroxide formation which inhibits further densification.

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