Microwave dielectric properties of A2P2O7 (A = Ca, Sr, Ba; Mg, Zn, Mn)

Jian Jiang Bian, Dong-Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

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Abstract

Microwave dielectric properties of A2P2O7 (A = Ca, Sr, Ba, Mn, Mg, Ba) ceramic materials were investigated by a network analyzer at the frequency of 10 GHz. It was found that A2P 2O7 ceramics could be sintered at relatively lower temperature below 1150°C, although the thortveitite type series, Mn 2P2O7, α-Mg2P 2O7 and α-Zn2P2O7 with smaller ionic radii of A cations were hard to sinter to full density. The dielectric constant of A2P2O7 is lower than 10. The Q × f value increased according to the sequence of δ-Ba 2P2O7, α-Sr2P 2O7 and β-Ca2P2O7 in dichromatic type series, and the sequence of Mn2P 2O7, α-Mg2P2O7 and α-Zn2P2O7 in thortveitite type series, respectively. The temperature coefficient of resonant frequency τ f for all samples exhibits negative value. Larger τf for α-Zn2P2O7, α-Mg 2P2O7 and δ-Ba2P 2O7 is mainly due to their reversible phase transformations. The microwave dielectric properties were discussed from the point view of bond valence.

Original languageEnglish
Pages (from-to)3521-3525
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume43
Issue number6 A
Publication statusPublished - 2004 Jun 1
Externally publishedYes

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Dielectric properties
dielectric properties
Microwaves
ceramics
microwaves
Electric network analyzers
Ceramic materials
phase transformations
resonant frequencies
Natural frequencies
analyzers
Permittivity
Phase transitions
Positive ions
permittivity
valence
cations
Temperature
radii
coefficients

Keywords

  • Ceramic
  • Dielectric properties

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Microwave dielectric properties of A2P2O7 (A = Ca, Sr, Ba; Mg, Zn, Mn). / Bian, Jian Jiang; Kim, Dong-Wan; Hong, Kug Sun.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 43, No. 6 A, 01.06.2004, p. 3521-3525.

Research output: Contribution to journalArticle

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AB - Microwave dielectric properties of A2P2O7 (A = Ca, Sr, Ba, Mn, Mg, Ba) ceramic materials were investigated by a network analyzer at the frequency of 10 GHz. It was found that A2P 2O7 ceramics could be sintered at relatively lower temperature below 1150°C, although the thortveitite type series, Mn 2P2O7, α-Mg2P 2O7 and α-Zn2P2O7 with smaller ionic radii of A cations were hard to sinter to full density. The dielectric constant of A2P2O7 is lower than 10. The Q × f value increased according to the sequence of δ-Ba 2P2O7, α-Sr2P 2O7 and β-Ca2P2O7 in dichromatic type series, and the sequence of Mn2P 2O7, α-Mg2P2O7 and α-Zn2P2O7 in thortveitite type series, respectively. The temperature coefficient of resonant frequency τ f for all samples exhibits negative value. Larger τf for α-Zn2P2O7, α-Mg 2P2O7 and δ-Ba2P 2O7 is mainly due to their reversible phase transformations. The microwave dielectric properties were discussed from the point view of bond valence.

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