Fabrication and ferroelectric/dielectric properties of La-doped PMN-PT ceramics with high optical transmittance

Abstract

Relaxor ferroelectric 0.75(Pb 1-3x/2 La x)(Mg 1/3 Nb 2/3)O 3-0.25(Pb 1-3x/2 La x)TiO 3 (La 3+ :PMN-PT x/75/25, where x = 2.8, 3.0, 3.5, and 4.0 mol% of La 3+) transparent ceramics were fabricated by the combination of oxygen atmosphere pressureless sintering and hot-pressing sintering process. The optical transmittances of above four ceramics are higher than 60% at the wavelength of 500-900 nm. La 3+ :PMN-PT 3.0/75/25 exhibits the highest transparency around 70% at 900 nm which is very close to the theoretical transmittance 71%. Each of the four ceramics exhibits the pure perovskite phases. They show fully dense microstructures and their relative densities are higher than 99.8%. The ferroelectric and dielectric measurements indicate that these four ceramics exhibit relaxation characteristics. With increasing La 3+ content, (200) peak in XRD patterns shifts to higher angles and the average grain size increases, while the temperature T max corresponding to the maximum r , the remanent polarizations P r and coercive fields E c decrease gradually.

Ultratransparent PMN‐PT Electro‐Optic Ceramics and Its Application in Optical Communication

“…Li et al reported that the extinction coefficient of Mn-doped 0.15Pb(In 1/2 Nb 1/2 )O 3 -0.57Pb(Mg 1/3 Nb 2/3 )O 3 -0.28PbTiO 3 (PIN-PMN-PT) single crystal is 0.0023 at 350 nm and decreases sharply to zero when the wavelength increases to larger than 450 nm. [22] X-ray diffraction (XRD) results in Figure S1a in the Supporting Information indicate that Sm-doped PMN-PT ceramics are all pure perovskite phase with pseudocubic structure, similar with La-doped PMN-PT transparent ceramics reported by Song et al [16] The single pseudocubic phase structure makes the birefringence scattering and secondary phases scattering negligible. Scattering loss caused by residual pores has been confirmed to be the main cause of the attenuation of the light intensity.…”

“…Details can be seen in previous articles. [16,17] Properties Characterization of PMN-PT Transparent Ceramics: The phase structure of Sm-0.88PMN-0.12PT transparent ceramics was characterized by XRD (Bruker D2 Phaser). Its microstructure was observed by SEM (JSM-6390LV).…”

“…In previous reports, we have successfully fabricated high transparent La-doped PMN-PT ceramics with a transmittance of 70% by a two-step sintering process. [16,17] In recent years, giant piezoelectric properties of 1500 and 4100 pC N −1 were obtained in Sm modified PMN-PT ceramics and crystals by Li et al [18] In general, the higher ferroelectric/piezoelectric properties, the better electro-optic properties. However, Sm-doped PMN-PT transparent ceramics and their electro-optic properties have not been reported so far.…”

Enhanced dielectric, ferroelectric, and optical properties in rare earth elements doped PMN-PT thin films

“…An ultrahigh piezoelectric coefficient (d 33 = 1500 pC/N) was obtained in Sm 3+ doped PMN-PT polycrystalline near MPB [1]. Because of the coupling function of excellent piezoelectric properties, efficient upconversion photoluminescence, and large electro-optic coefficient, RE (Pr 3+ , Yb 3+ , La 3+ , Er 3+ ) doped PMN-PT based ceramic were intensively investigated [7,[19][20][21][22].…”

“…During the photoluminescence process, low energy photons were absorbed while high energy photons were produced. For example, the La 3+ doped PMN-PT ceramics represented a high electro-optic (EO) coefficient on the value of 19.9×10 -16 (m/V) -2 [28,29], and a specific high optical transparency reaches up to 70% [19]. Therefore, the PMN-PT thin films doped with RE ions were expected to be multifunctional optical materials and deserved to be further investigated.…”