Hydrothermal synthesis of KNbO3 and NaNbO3 powders

Gregory K L Goh; Fred F. Lange; Sossina M. Haile; Carlos G. Levi

doi:10.1557/JMR.2003.0044

Hydrothermal synthesis of KNbO₃ and NaNbO₃ powders

Gregory K L Goh, Fred F. Lange, Sossina M. Haile, Carlos G. Levi

Materials Science and Engineering

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

155 Scopus citations

Abstract

Orthorhombic KNbO₃ and NaNbO₃ powders were hydrothermally synthesized in KOH and NaOH solutions (6.7-15 M) at 150 and 200 °C. An intermediate hexaniobate species formed first before eventually converting to the perovskite phase. For synthesis in KOH solutions, the stability of the intermediate hexaniobate ion increased with decreasing KOH concentrations and temperatures. This led to significant variations in the induction periods and accounted for the large disparity in the mass of recovered powder for different processing parameters. It is also believed that protons were incorporated in the lattice of the as-synthesized KNbO₃ powders as water molecules and hydroxyl ions.

Original language	English (US)
Pages (from-to)	338-345
Number of pages	8
Journal	Journal of Materials Research
Volume	18
Issue number	2
DOIs	https://doi.org/10.1557/JMR.2003.0044
State	Published - Feb 2003

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1557/JMR.2003.0044

Cite this

@article{183ed0a78a57461cbeeca40869fc8959,

title = "Hydrothermal synthesis of KNbO3 and NaNbO3 powders",

abstract = "Orthorhombic KNbO3 and NaNbO3 powders were hydrothermally synthesized in KOH and NaOH solutions (6.7-15 M) at 150 and 200 °C. An intermediate hexaniobate species formed first before eventually converting to the perovskite phase. For synthesis in KOH solutions, the stability of the intermediate hexaniobate ion increased with decreasing KOH concentrations and temperatures. This led to significant variations in the induction periods and accounted for the large disparity in the mass of recovered powder for different processing parameters. It is also believed that protons were incorporated in the lattice of the as-synthesized KNbO3 powders as water molecules and hydroxyl ions.",

author = "Goh, {Gregory K L} and Lange, {Fred F.} and Haile, {Sossina M.} and Levi, {Carlos G.}",

note = "Funding Information: This work was supported by the Materials Research Laboratory program of the National Science Foundation under Award No. DMR00-80034. G.K.L. Goh acknowledges the Institute of Materials Research and Engineering (Singapore) for the provision of a research scholarship. Dr. Joon Hwan Choi is thanked for the TEM results while Dr. Sonjong Hwang of the California Institute of Technology is thanked for collecting the 1H MAS NMR data.",

year = "2003",

month = feb,

doi = "10.1557/JMR.2003.0044",

language = "English (US)",

volume = "18",

pages = "338--345",

journal = "Journal of Materials Research",

issn = "0884-2914",

publisher = "Materials Research Society",

number = "2",

}

TY - JOUR

T1 - Hydrothermal synthesis of KNbO3 and NaNbO3 powders

AU - Goh, Gregory K L

AU - Lange, Fred F.

AU - Haile, Sossina M.

AU - Levi, Carlos G.

N1 - Funding Information: This work was supported by the Materials Research Laboratory program of the National Science Foundation under Award No. DMR00-80034. G.K.L. Goh acknowledges the Institute of Materials Research and Engineering (Singapore) for the provision of a research scholarship. Dr. Joon Hwan Choi is thanked for the TEM results while Dr. Sonjong Hwang of the California Institute of Technology is thanked for collecting the 1H MAS NMR data.

PY - 2003/2

Y1 - 2003/2

N2 - Orthorhombic KNbO3 and NaNbO3 powders were hydrothermally synthesized in KOH and NaOH solutions (6.7-15 M) at 150 and 200 °C. An intermediate hexaniobate species formed first before eventually converting to the perovskite phase. For synthesis in KOH solutions, the stability of the intermediate hexaniobate ion increased with decreasing KOH concentrations and temperatures. This led to significant variations in the induction periods and accounted for the large disparity in the mass of recovered powder for different processing parameters. It is also believed that protons were incorporated in the lattice of the as-synthesized KNbO3 powders as water molecules and hydroxyl ions.

AB - Orthorhombic KNbO3 and NaNbO3 powders were hydrothermally synthesized in KOH and NaOH solutions (6.7-15 M) at 150 and 200 °C. An intermediate hexaniobate species formed first before eventually converting to the perovskite phase. For synthesis in KOH solutions, the stability of the intermediate hexaniobate ion increased with decreasing KOH concentrations and temperatures. This led to significant variations in the induction periods and accounted for the large disparity in the mass of recovered powder for different processing parameters. It is also believed that protons were incorporated in the lattice of the as-synthesized KNbO3 powders as water molecules and hydroxyl ions.

UR - http://www.scopus.com/inward/record.url?scp=0038337733&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038337733&partnerID=8YFLogxK

U2 - 10.1557/JMR.2003.0044

DO - 10.1557/JMR.2003.0044

M3 - Article

AN - SCOPUS:0038337733

SN - 0884-2914

VL - 18

SP - 338

EP - 345

JO - Journal of Materials Research

JF - Journal of Materials Research

IS - 2

ER -

Hydrothermal synthesis of KNbO₃ and NaNbO₃ powders

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this