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Dielectric behavior and Raman spectra of lanthanum-doped lead magnesium niobate ceramics

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Abstract

Lanthanum-doped lead magnesium niobate (PLMN) ceramics were fabricated by columbite route. The effects of La-addition on dielectric behavior and Raman spectra were investigated. The trivalent La3+-doping showed inhibiting effects on grain growth process. The average grain size decreased and pyrochlore phase was detected along with the perovskite phase above 2 mol% La-addition. Temperature dependence of permittivity measured at 1 kHz was investigated. Due to La3+-doping, the maximum of dielectric constant decreased and the temperature of the maximum permittivity moved to lower temperature. An oval-form hysteresis loop was observed on La-doped (3 mol%) lead magnesium niobate (PMN) sample, which revealed that La-doped PMN owned partially normal ferroelectric feature. Raman spectra showed a shift of the peak around 270 cm−1, which identified a distortion of the center symmetric ordered structure and enforced B-site compositional fluctuation. The shift of A1g mode (around 780 cm−1) indicated that degree of chemical order at B-site increased and PLMN contained 1:1 B-site ordered nanoregion (clusters) with Fm-3m symmetry.

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Abbreviations

PMN:

Lead magnesium niobate

MLCC:

Multilayer ceramic capacitors

DPT:

Diffuse phase transition

PLMN:

\( \left( {{\text{Pb}}_{{1-{\text{x}}}} {\text{La}}_{\text{x}} } \right)\left[ {{\text{Mg}}_{{\left( {1{\text{ + x}}} \right) / 3}} {\text{Nb}}_{{\left( { 2 {\text{--x}}} \right)/ 3}} } \right]{\text{O}}_{ 3} \)

FWHM:

The Full width at half maximum

MN:

\( {\text{Mg}}_{{\left( {1 + {\text{x}}} \right)/3}} {\text{Nb}}_{{\left( {2 - {\text{x}}} \right)/3}} {\text{O}}_{{2 - {\text{x}}/2}} \)

PVA:

Polyvinyl alcohol

SEM:

Scanning Electronic Microscopy

XRD:

X-ray diffraction

T m :

The temperature of the maximum permittivity

ε m :

The maximum permittivity

tanδ :

Dissipation loss

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Authors and Affiliations

  1. School of Material Science and Engineering, Southwest University of Science and Technology, 621010, Mianyang, People’s Republic of China

    Tao Li, Jingsong Liu, Huiqin Li & Youchao Xu

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  1. Tao Li
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  2. Jingsong Liu
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  3. Huiqin Li
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  4. Youchao Xu
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Correspondence to Jingsong Liu.

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Li, T., Liu, J., Li, H. et al. Dielectric behavior and Raman spectra of lanthanum-doped lead magnesium niobate ceramics. J Mater Sci: Mater Electron 22, 1188–1194 (2011). https://doi.org/10.1007/s10854-010-0282-9

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