Sol-gel processing and characterization of potassium niobate nano-powders by an EDTA/citrate complexing method

Yang Cao; Kongjun Zhu; Jinhao Qiu; Xuming Pang; Hongli Ji

doi:10.1016/j.solidstatesciences.2012.03.011

Sol-gel processing and characterization of potassium niobate nano-powders by an EDTA/citrate complexing method

Yang Cao, Kongjun Zhu, Jinhao Qiu, Xuming Pang, Hongli Ji

研究成果: Article › 査読

11 被引用数 (Scopus)

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The present research describes a modified sol-gel technique used to obtain nano-crystalline potassium niobate (KNbO ₃) powders by using ethylene diamine tetraacetic acid (EDTA)/citrate as a complexing agent. The metal ions chemically interact with EDTA in the precursor sol. The aging treatments lead to the formation of a precursor-polymeric gel network. The effects of the amounts of citric acid and EDTA on the stability of the precursor sol are investigated. The influence of excess K on the formation of pure-phase KNbO ₃ powders is also studied. The obtained gels and powders are characterized by thermogravimetric-differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that a stable precursor sol is formed when n(CA):n(M ⁿ⁺) = 3:1 and n(EDTA):n(NH ₄OH) = 1:3.5. The xerogel is calcined at 700-850 °C to prepare the KNbO ₃ nano-powder. The smallest grain size of the sample obtained at 850 °C is about 60 nm when the K/Nb molar ratio equals 1.2. Crown

本文言語	English
ページ（範囲）	655-660
ページ数	6
ジャーナル	Solid State Sciences
巻	14
号	5
DOI	https://doi.org/10.1016/j.solidstatesciences.2012.03.011
出版ステータス	Published - 2012 5月
外部発表	はい

ASJC Scopus subject areas

化学 (全般)
材料科学（全般）
凝縮系物理学

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10.1016/j.solidstatesciences.2012.03.011

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title = "Sol-gel processing and characterization of potassium niobate nano-powders by an EDTA/citrate complexing method",

abstract = "The present research describes a modified sol-gel technique used to obtain nano-crystalline potassium niobate (KNbO 3) powders by using ethylene diamine tetraacetic acid (EDTA)/citrate as a complexing agent. The metal ions chemically interact with EDTA in the precursor sol. The aging treatments lead to the formation of a precursor-polymeric gel network. The effects of the amounts of citric acid and EDTA on the stability of the precursor sol are investigated. The influence of excess K on the formation of pure-phase KNbO 3 powders is also studied. The obtained gels and powders are characterized by thermogravimetric-differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that a stable precursor sol is formed when n(CA):n(M n+) = 3:1 and n(EDTA):n(NH 4OH) = 1:3.5. The xerogel is calcined at 700-850 °C to prepare the KNbO 3 nano-powder. The smallest grain size of the sample obtained at 850 °C is about 60 nm when the K/Nb molar ratio equals 1.2. Crown",

keywords = "EDTA/citrate, KNbO, Nano-powder, Sol-gel",

author = "Yang Cao and Kongjun Zhu and Jinhao Qiu and Xuming Pang and Hongli Ji",

note = "Funding Information: The present work is supported by the National Nature Science Foundation of China (No. 51172108 ), the Program for Changjiang Scholars and Innovative Research Team in University ( IRT0968 ), the Program for New Century Excellent Talents in University ( NCET-10-0070 ), NUAA Research Fund for Fundamental Research ( NJ2010010 , NZ2010001 ), as well as the Project Funded by the Priority Academic Program Development of the Jiangsu Higher Education Institutions .",

year = "2012",

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doi = "10.1016/j.solidstatesciences.2012.03.011",

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T1 - Sol-gel processing and characterization of potassium niobate nano-powders by an EDTA/citrate complexing method

AU - Cao, Yang

AU - Zhu, Kongjun

AU - Qiu, Jinhao

AU - Pang, Xuming

AU - Ji, Hongli

N1 - Funding Information: The present work is supported by the National Nature Science Foundation of China (No. 51172108 ), the Program for Changjiang Scholars and Innovative Research Team in University ( IRT0968 ), the Program for New Century Excellent Talents in University ( NCET-10-0070 ), NUAA Research Fund for Fundamental Research ( NJ2010010 , NZ2010001 ), as well as the Project Funded by the Priority Academic Program Development of the Jiangsu Higher Education Institutions .

PY - 2012/5

Y1 - 2012/5

N2 - The present research describes a modified sol-gel technique used to obtain nano-crystalline potassium niobate (KNbO 3) powders by using ethylene diamine tetraacetic acid (EDTA)/citrate as a complexing agent. The metal ions chemically interact with EDTA in the precursor sol. The aging treatments lead to the formation of a precursor-polymeric gel network. The effects of the amounts of citric acid and EDTA on the stability of the precursor sol are investigated. The influence of excess K on the formation of pure-phase KNbO 3 powders is also studied. The obtained gels and powders are characterized by thermogravimetric-differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that a stable precursor sol is formed when n(CA):n(M n+) = 3:1 and n(EDTA):n(NH 4OH) = 1:3.5. The xerogel is calcined at 700-850 °C to prepare the KNbO 3 nano-powder. The smallest grain size of the sample obtained at 850 °C is about 60 nm when the K/Nb molar ratio equals 1.2. Crown

AB - The present research describes a modified sol-gel technique used to obtain nano-crystalline potassium niobate (KNbO 3) powders by using ethylene diamine tetraacetic acid (EDTA)/citrate as a complexing agent. The metal ions chemically interact with EDTA in the precursor sol. The aging treatments lead to the formation of a precursor-polymeric gel network. The effects of the amounts of citric acid and EDTA on the stability of the precursor sol are investigated. The influence of excess K on the formation of pure-phase KNbO 3 powders is also studied. The obtained gels and powders are characterized by thermogravimetric-differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that a stable precursor sol is formed when n(CA):n(M n+) = 3:1 and n(EDTA):n(NH 4OH) = 1:3.5. The xerogel is calcined at 700-850 °C to prepare the KNbO 3 nano-powder. The smallest grain size of the sample obtained at 850 °C is about 60 nm when the K/Nb molar ratio equals 1.2. Crown

KW - EDTA/citrate

KW - KNbO

KW - Nano-powder

KW - Sol-gel

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Sol-gel processing and characterization of potassium niobate nano-powders by an EDTA/citrate complexing method

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