Effects of Manganese Oxides/Gold Composite Electrode on Piezoelectric Properties of Lead Magnesium Niobate Titanate Single Crystal

We have confirmed a high dielectric constant after poling $\varepsilon_{33}{}^{\text{T}}/\varepsilon_{0}$ of 7700 and piezoelectric constant $d_{33} = 2250$ pC/N, which are 40% larger than those of the initial sample, for a lead magnesium niobate--lead titanate 0.72 Pb(Mg 1/3 Nb 2/3 )O 3 --0.28 PbTi...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 50; no. 9; pp. 09NC05 - 09NC05-3
Main Authors Yamashita, Yohachi (John), Yamamoto, Noriko, Itsumi, Kazuhiro, Hosono, Yasuharu
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.09.2011
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Summary:We have confirmed a high dielectric constant after poling $\varepsilon_{33}{}^{\text{T}}/\varepsilon_{0}$ of 7700 and piezoelectric constant $d_{33} = 2250$ pC/N, which are 40% larger than those of the initial sample, for a lead magnesium niobate--lead titanate 0.72 Pb(Mg 1/3 Nb 2/3 )O 3 --0.28 PbTiO 3 single crystal plate with a manganese oxide/gold (Au) composite electrode. The increased $\varepsilon_{33}{}^{\text{T}}/\varepsilon_{0}$ and $d_{33}$ may be attributable to the smaller domains realized by fine patterning semiconductor manganese oxide and conductive Au composite electrodes on the single crystal plate. The use of a semiconductor/conductor composite electrode is an effective method of improving the properties of piezoelectric single-crystal transducers.
Bibliography:Temperature profile of heat treatment (HT) at 800 °C for (a) PMN--PT single crystals on Pt boat (inset) and (b) a quartz tube furnace (inset). PMN-PT single crystals of samples (a) without HT, (b) with HT at 700 °C without using Mn, and (c) with HT at 700 °C using Mn. SEM microstructure of the surface of (c) sample with HT at 800 °C using Mn on the PMN--PT plate. Temperature dependence of dielectric constants after poling, the $\varepsilon_{33}{}^{\text{T}}/\varepsilon_{0}$ values of the samples (a) without HT, (b) with HT without using Mn, and (c) with HT using Mn/Au composite electrode on the PMN--PT crystal. Schematic images of domain formation for samples (a) without HT using Au electrode and (c) with HT using Mn/Au composite electrode on the PMN--PT single crystal during poling process with different poling field.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.50.09NC05