Super Stable Ferroelectrics with High Curie Point

Gao, Zhipeng; Lu, Chengjia; Wang, Yuhang; Yang, Sinuo; Yu, Yuying; He, Hongliang

doi:10.1038/srep24139

Cited by 23 publications

(15 citation statements)

References 33 publications

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“…The d 33 of PL Eu 2 Ti 2 O 7 samples (1‐2) were measured as 0.9 and 0.7 pC/N, respectively. The variation in the d 33 value is mainly due to the different poling conditions of the samples . The sample 1 and 2 were poled under the electric field as 25 and 21 kV/mm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The variation in the d 33 value is mainly due to the different poling conditions of the samples. 35 The sample 1 and 2 were poled under the electric field as 25 and 21 kV/mm, respectively. The difference of the poling electrical field is because of the different breakdown field of each sample.…”

Section: Experiments Proceduresmentioning

confidence: 99%

“…PL structure ferroelectric materials are well-known for their high Curie point (T c ) and high thermal depoling temperature (T d ). Some of them have T d above 1300°C, [35][36][37] but PL Eu 2 Ti 2 O 7 has a relatively low T d of~800°C, which is because of the pyrochlore Eu 2 Ti 2 O 7 started to form in the PL structure matrix at this temperature. Figure 5B shows the temperature dependence of the permittivity and loss (tanh) at different frequencies of 1, 10, and 100 kHz, respectively.…”

Section: Experiments Proceduresmentioning

confidence: 99%

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Phase transition of Eu₂Ti₂O₇ under high pressure and a new ferroelectric phase with perovskite‐like layered structure

Gao

Liu

et al. 2018

J Am Ceram Soc

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Ferroelectrics with perovskite‐like layered (PL) structure are well‐known for their high Tc and the application prospect of high‐temperature‐piezoelectric sensing. In this study, the PL‐structure Eu2Ti2O7 was prepared by 1‐step high‐pressure sintering, which show the pyrochlore structure of Eu2Ti2O7 would change into PL structure at 11 GPa, 1300°C. The PL‐structure Eu2Ti2O7 is metastable, which will change back to pyrochlore structure at about 900°C in the air. The PL‐structure Eu2Ti2O7 was confirmed as a high‐temperature ferroelectric material for the first time. The ferroelectric domain switching was directly observed using piezoelectric force microscope. The piezoelectric constant of the PL Eu2Ti2O7 ceramic was measured as 0.7‐0.9 pC/N and its thermal depoling temperature (Td) was determined as 800°C, which is associated with the PL‐pyrochlore transition.

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Section: Resultsmentioning

confidence: 99%

Section: Experiments Proceduresmentioning

confidence: 99%

Section: Experiments Proceduresmentioning

confidence: 99%

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Phase transition of Eu₂Ti₂O₇ under high pressure and a new ferroelectric phase with perovskite‐like layered structure

Gao

Liu

et al. 2018

J Am Ceram Soc

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“…The most worldwide commercially used piezoelectrics are lead zirconate titanate (PZT) ceramics and PZTbased solutions nowadays. However, the typical T C temperature is 193°C for the commercial PZT5H ceramics, which is relatively low and can not meet the requirements of the above applications [8,9]. High T C piezoelectric single crystals, some present excellent piezoelectricity but the T C is not high enough [10], and some have small piezoelectric constant (d 33 ) although possess high T C temperature, i.e., 6 pC N −1 and 1210°C of LiNbO 3 [11], whereas their crystal growth is all expensive and difficult, which restricts the applications in electronic and electrical devices.…”

Section: Introductionmentioning

confidence: 99%

Composition design of PMN-PH-PT piezoelectric ceramics for high-temperature actuator applications

Zhu

Fang

Zhang

et al. 2020

Mater. Res. Express

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High-Curie temperature (T m ) piezoelectric ceramics 0.15Pb(Mg 1/3 Nb 2/3 )O 3 -xPbHfO 3 -(0.85-x)PbTiO 3 (0.15PMN-xPH-(0.85-x) PT, x=0.36, 0.38, 0.39, 0.40, 0.42, were synthesized by the solid-state reaction method via the columbite precursor route. The synthesized 0.15PMN-PH-PT ceramics exhibit pure perovskite structure with compositions locate near the morphotropic phase boundary (MPB), where the rhombohedral phase and the tetragonal phase coexist. The sintered samples present high densification, in which the 0.15Pb(Mg 1/3 Nb 2/3 )O 3 -0.38PbHfO 3 -0.47PbTiO 3 (0.15PMN-0.38PH-0.47PT) ceramics present the highest relative density, being 97.76%. The dielectric performance-temperature curves measured at different frequencies, the Curie-Weiss law fitting and the quadratic law fitting indicate that the ferroelectric phase transition from ferroelectric phase to paraelectric phase occurred at T 0 in the 0.15PMN-PH-PT ceramics is driven by the displacive phase transition, and the 0.15PMN-PH-PT ceramics belong to normal ferroelectrics with diffused phase transition characteristic. Due to the MPB effect and high relative density, the 0.15PMN-0.38PH-0.47PT ceramics exhibit the best integral electrical properties, excellent thermal stability and large electric field induced strain, which present prospect promising for actuator applications under elevated environmental temperatures.

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“…During the past decades there has been significant interest and therefore research into the problem of ultrasonic transducers for harsh environments [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,…”

Section: Introductionmentioning

confidence: 99%

State-of-the-Art and Practical Guide to Ultrasonic Transducers for Harsh Environments Including Temperatures above 2120 °F (1000 °C) and Neutron Flux above 1013 n/cm2

Tittmann

Batista

Trivedi

et al. 2019

Sensors

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In field applications currently used for health monitoring and nondestructive testing, ultrasonic transducers primarily employ PZT5-H as the piezoelectric element for ultrasound transmission and detection. This material has a Curie–Weiss temperature that limits its use to about 210 °C. Some industrial applications require much higher temperatures, i.e., 1000–1200 °C and possible nuclear radiation up to 1020 n/cm2 when performance is required in a reactor environment. The goal of this paper is the survey and review of piezoelectric elements for use in harsh environments for the ultimate purpose for structural health monitoring (SHM), non-destructive evaluation (NDE) and material characterization (NDMC). The survey comprises the following categories: 1. High-temperature applications with single crystals, thick-film ceramics, and composite ceramics, 2. Radiation-tolerant materials, and 3. Spray-on transducers for harsh-environment applications. In each category the known characteristics are listed, and examples are given of performance in harsh environments. Highlighting some examples, the performance of single-crystal lithium niobate wafers is demonstrated up to 1100 °C. The wafers with the C-direction normal to the wafer plane were mounted on steel cylinders with high-temperature Sauereisen and silver paste wire mountings and tested in air. In another example, the practical use in harsh radiation environments aluminum nitride (AlN) was found to be a good candidate operating well in two different nuclear reactors. The radiation hardness of AlN was evident from the unaltered piezoelectric coefficient after a fast and thermal neutron exposure in a nuclear reactor core (thermal flux = 2.12 × 1013 ncm−2; fast flux 2 (>1.0 MeV) = 4.05 × 1013 ncm−2; gamma dose rate: 1 × 109 r/h; temperature: 400–500 °C). Additionally, some of the high-temperature transducers are shown to be capable of mounting without requiring coupling material. Pulse-echo signal amplitudes (peak-to-peak) for the first two reflections as a function of the temperature for lithium niobate thick-film, spray-on transducers were observed to temperatures of about 900 °C. Guided-wave send-and-receive operation in the 2–4 MHz range was demonstrated on 2–3 mm thick Aluminum (6061) structures for possible field deployable applications where standard ultrasonic coupling media do not survive because of the harsh environment. This approach would benefit steam generators and steam pipes where temperatures are above 210 °C. In summary, there are several promising approaches to ultrasonic transducers for harsh environments and this paper presents a survey based on literature searches and in-house laboratory observations.

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Super Stable Ferroelectrics with High Curie Point

Cited by 23 publications

References 33 publications

Phase transition of Eu₂Ti₂O₇ under high pressure and a new ferroelectric phase with perovskite‐like layered structure

Phase transition of Eu₂Ti₂O₇ under high pressure and a new ferroelectric phase with perovskite‐like layered structure

Composition design of PMN-PH-PT piezoelectric ceramics for high-temperature actuator applications

State-of-the-Art and Practical Guide to Ultrasonic Transducers for Harsh Environments Including Temperatures above 2120 °F (1000 °C) and Neutron Flux above 1013 n/cm2

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Super Stable Ferroelectrics with High Curie Point

Cited by 23 publications

References 33 publications

Phase transition of Eu2Ti2O7 under high pressure and a new ferroelectric phase with perovskite‐like layered structure

Phase transition of Eu2Ti2O7 under high pressure and a new ferroelectric phase with perovskite‐like layered structure

Composition design of PMN-PH-PT piezoelectric ceramics for high-temperature actuator applications

State-of-the-Art and Practical Guide to Ultrasonic Transducers for Harsh Environments Including Temperatures above 2120 °F (1000 °C) and Neutron Flux above 1013 n/cm2

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Phase transition of Eu₂Ti₂O₇ under high pressure and a new ferroelectric phase with perovskite‐like layered structure

Phase transition of Eu₂Ti₂O₇ under high pressure and a new ferroelectric phase with perovskite‐like layered structure