Phase analysis and microwave dielectric properties of BaO-Nd 2O 3-5TiO 2 composite ceramics using variable size TiO 2 reagents

Amanda L. Snashall; Lasse Norén; Yun Liu; Toru Yamashita; Frank Brink; Raymond L. Withers

doi:10.1016/j.ceramint.2011.04.070

Phase analysis and microwave dielectric properties of BaO-Nd ₂O ₃-5TiO ₂ composite ceramics using variable size TiO ₂ reagents

Amanda L. Snashall, Lasse Norén, Yun Liu^*, Toru Yamashita, Frank Brink, Raymond L. Withers

^*Corresponding author for this work

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

7 Citations (Scopus)

Abstract

There are significant inconsistencies in published literature surrounding the phase analysis and physical properties of ceramics with the nominal composition BaO-Nd ₂O ₃-5TiO ₂ (BNT125). A careful phase analysis investigation of BNT125 ceramics using variable size TiO ₂ reagents was therefore undertaken using XRD, FESEM and EPMA with corresponding dielectric properties characterised over 2-3 GHz. Three distinct phases were consistently formed: Ba _6-3xNd _8+2xTi ₁₈O ₅₄ (x ∼ 0.67), Ba ₂Ti ₉O ₂₀ and TiO ₂. The use of nano-scale TiO ₂ reagents significantly reduced porosity and improved the dielectric properties of the composite ceramics, while markedly reducing processing times. Structural and crystal chemical indications as to the origin of this system's physical properties are discussed, with these results providing new insights into optimisation paths for microwave dielectric materials of this type.

Original language	English
Pages (from-to)	S153-S157
Journal	Ceramics International
Volume	38
Issue number	SUPPL. 1
DOIs	https://doi.org/10.1016/j.ceramint.2011.04.070
Publication status	Published - Jan 2012

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title = "Phase analysis and microwave dielectric properties of BaO-Nd 2O 3-5TiO 2 composite ceramics using variable size TiO 2 reagents",

abstract = "There are significant inconsistencies in published literature surrounding the phase analysis and physical properties of ceramics with the nominal composition BaO-Nd 2O 3-5TiO 2 (BNT125). A careful phase analysis investigation of BNT125 ceramics using variable size TiO 2 reagents was therefore undertaken using XRD, FESEM and EPMA with corresponding dielectric properties characterised over 2-3 GHz. Three distinct phases were consistently formed: Ba 6-3xNd 8+2xTi 18O 54 (x ∼ 0.67), Ba 2Ti 9O 20 and TiO 2. The use of nano-scale TiO 2 reagents significantly reduced porosity and improved the dielectric properties of the composite ceramics, while markedly reducing processing times. Structural and crystal chemical indications as to the origin of this system's physical properties are discussed, with these results providing new insights into optimisation paths for microwave dielectric materials of this type.",

keywords = "A. Sintering, B. Composites, C. Dielectric properties, D. Titanates",

author = "Snashall, {Amanda L.} and Lasse Nor{\'e}n and Yun Liu and Toru Yamashita and Frank Brink and Withers, {Raymond L.}",

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doi = "10.1016/j.ceramint.2011.04.070",

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volume = "38",

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T1 - Phase analysis and microwave dielectric properties of BaO-Nd 2O 3-5TiO 2 composite ceramics using variable size TiO 2 reagents

AU - Snashall, Amanda L.

AU - Norén, Lasse

AU - Liu, Yun

AU - Yamashita, Toru

AU - Brink, Frank

AU - Withers, Raymond L.

PY - 2012/1

Y1 - 2012/1

N2 - There are significant inconsistencies in published literature surrounding the phase analysis and physical properties of ceramics with the nominal composition BaO-Nd 2O 3-5TiO 2 (BNT125). A careful phase analysis investigation of BNT125 ceramics using variable size TiO 2 reagents was therefore undertaken using XRD, FESEM and EPMA with corresponding dielectric properties characterised over 2-3 GHz. Three distinct phases were consistently formed: Ba 6-3xNd 8+2xTi 18O 54 (x ∼ 0.67), Ba 2Ti 9O 20 and TiO 2. The use of nano-scale TiO 2 reagents significantly reduced porosity and improved the dielectric properties of the composite ceramics, while markedly reducing processing times. Structural and crystal chemical indications as to the origin of this system's physical properties are discussed, with these results providing new insights into optimisation paths for microwave dielectric materials of this type.

AB - There are significant inconsistencies in published literature surrounding the phase analysis and physical properties of ceramics with the nominal composition BaO-Nd 2O 3-5TiO 2 (BNT125). A careful phase analysis investigation of BNT125 ceramics using variable size TiO 2 reagents was therefore undertaken using XRD, FESEM and EPMA with corresponding dielectric properties characterised over 2-3 GHz. Three distinct phases were consistently formed: Ba 6-3xNd 8+2xTi 18O 54 (x ∼ 0.67), Ba 2Ti 9O 20 and TiO 2. The use of nano-scale TiO 2 reagents significantly reduced porosity and improved the dielectric properties of the composite ceramics, while markedly reducing processing times. Structural and crystal chemical indications as to the origin of this system's physical properties are discussed, with these results providing new insights into optimisation paths for microwave dielectric materials of this type.

KW - A. Sintering

KW - B. Composites

KW - C. Dielectric properties

KW - D. Titanates

UR - http://www.scopus.com/inward/record.url?scp=84655169888&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2011.04.070

DO - 10.1016/j.ceramint.2011.04.070

M3 - Article

SN - 0272-8842

VL - 38

SP - S153-S157

JO - Ceramics International

JF - Ceramics International

IS - SUPPL. 1

ER -

Phase analysis and microwave dielectric properties of BaO-Nd ₂O ₃-5TiO ₂ composite ceramics using variable size TiO ₂ reagents

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