Ferroelectric-Ferroelastic Transitions in (NaBi)TiO-BaTiO Single Crystals.

The comprehensive understanding of (NaBi)TiO-BaTiO (NBT-BT) lattice structure is highly desired to develop lead-free ferroelectric materials. However, most of the previous studies focused on the improvement of piezoelectric properties at room temperature, and many structural puzzles are left unclear. In this work, the lattice structure of a ferroelastic phase and the ferroelectric-ferroelastic transitions in both rhombohedral NBT and tetragonal NBT-8%BT single crystals are investigated in detail.

Formation of Head/Tail-to-Body Charged Domain Walls by Mechanical Stress.

Domain walls (DWs) in ferroelectric materials are interfaces that separate domains with different polarizations. Charged domain walls (CDWs) and neutral domain walls are commonly classified depending on the charge state at the DWs. CDWs are particularly attractive as they are configurable elements, which can enhance field susceptibility and enable functionalities such as conductance control.

Giant electric field-induced strain in lead-free piezoceramics.

Piezoelectric actuators are indispensable over a wide range of industries for their fast response and precise displacement. Most commercial piezoelectric actuators contain lead, posing environmental challenges. We show that a giant strain (1.

A very low frequency (VLF) antenna based on clamped bending-mode structure magnetoelectric laminates.

As the development of wireless communication devices tends to be highly integrated, the miniaturization of very low frequency (VLF) antenna units has always been an unresolved issue. Here, a novel VLF mechanical communication antenna using magnetoelectric (ME) laminates with bending-mode structure is realized. ME laminates combines magnetostrictive Metglas amorphous ribbons and piezoelectric 0.

Power Batteries Health Monitoring: A Magnetic Imaging Method Based on Magnetoelectric Sensors.

With the popularity of electric vehicles, the ever-increasing demand for high-capacity batteries highlights the need for monitoring the health status of batteries. In this article, we proposed a magnetic imaging technique (MIT) to investigate the health status of power batteries nondestructively. This technique is based on a magnetic sensor array, which consists of a 16-channel high-performance magnetoelectric sensor, and the noise equivalent magnetic induction (NEB) of each channel reaches 3-5 pT/Hz@10 Hz.

Optimization of Ferroelectric Ordering and Thermal Stability in NaBiTiO-Based Lead-Free Single Crystal through Defect Engineering.

Environmentally friendly lead-free piezoelectric materials have been attracting significant attention in recent years. NaBiTiO-based relaxor ferroelectrics have found acceptance for application in promising lead-free transducers in high-power ultrasonic devices. However, their low thermal stability, i.

Reporting Excellent Transverse Piezoelectric and Electro-Optic Effects in Transparent Rhombohedral PMN-PT Single Crystal by Engineered Domains.

Transparent ferroelectric crystals with high piezoelectricity are challenging to build because of their complex structure and disordered domains in rhombohedral relaxor ferroelectrics. There are eight domains along the <111> direction, which cause light scattering. In this study, perfect transparency is achieved along the [110] and [001] directions in [110]-poled rhombohedral 0.

Manipulating ferroelectric behaviors via electron-beam induced crystalline defects.

Ferroelectric nanoplates are attractive for applications in nanoelectronic devices. Defect engineering has been an effective way to control and manipulate ferroelectric properties in nanoscale devices. Defects can act as pinning centers for ferroelectric domain wall motion, altering the switching properties and domain dynamics of ferroelectrics.

Search for Axionlike Dark Matter Using Solid-State Nuclear Magnetic Resonance.

We report the results of an experimental search for ultralight axionlike dark matter in the mass range 162-166 neV. The detection scheme of our Cosmic Axion Spin Precession Experiment is based on a precision measurement of ^{207}Pb solid-state nuclear magnetic resonance in a polarized ferroelectric crystal. Axionlike dark matter can exert an oscillating torque on ^{207}Pb nuclear spins via the electric dipole moment coupling g_{d} or via the gradient coupling g_{aNN}.

Giant tuning of ferroelectricity in single crystals by thickness engineering.

Thickness effect and mechanical tuning behavior such as strain engineering in thin-film ferroelectrics have been extensively studied and widely used to tailor the ferroelectric properties. However, this is never the case in freestanding single crystals, and conclusions from thin films cannot be duplicated because of the differences in the nature and boundary conditions of the thin-film and freestanding single-crystal ferroelectrics. Here, using in situ biasing transmission electron microscopy, we studied the thickness-dependent domain switching behavior and predicted the trend of ferroelectricity in nanoscale materials induced by surface strain.

A Two-Step Annealing Method to Enhance the Pyroelectric Properties of Mn:PIMNT Chips for Infrared Detectors.

Mn:0.15Pb(InNb)O-0.55Pb(MgNb)O-0.

FEM simulation and comparison of PMN-PT single crystals based phased array ultrasonic transducer by alternating current poling and direct current poling.

The Finite element modeling (FEM) simulation and comparison of electroacoustic properties for alternating current poling (ACP) phased arrays and direct current poling (DCP) phased arrays were investigated. The simulated electrical impedance reveals that the effective working bandwidth of ACP phased arrays is wider than that of DCP phased arrays as a whole. Besides, the ACP phased arrays have a higher effective electromechanical coupling coefficient k compared to DCP arrays, which indicates that higher electromechanical conversion capacity is obtained.

Giant tunability of upconversion photoluminescence in Er-doped (K, Na)NbO single crystals.

Perovskite oxides with luminescent ions hold great promise in optoelectronic devices because of their outstanding thermal stabilities and electro-optic performance. As one typical perovskite upconversion (UC) host material, lead-free potassium sodium niobate ((K, Na)NbO3/(KxNa1-x)NbO3 or KNN) has attracted much attention in recent years. In the present work, a novel routine was developed to tune the upconversion photoluminescence (UC PL) performance by controlling the oxygen vacancy concentration in the KNN matrix, based on the 0.

Nonvolatile Control of the Electronic Properties of InCrO Semiconductor Films by Ferroelectric Polarization Charge.

A series of Cr-doped InCrO (ICO) semiconductor thin films were epitaxially grown on (111)-oriented 0.71Pb(MgNb)O-0.29PbTiO (PMN-0.

Comment on "Giant electromechanical coupling of relaxor ferroelectrics controlled by polar nanoregion vibrations".

Manley (, 16 September 2016, p. e1501814) report the splitting of a transverse acoustic phonon branch below in the relaxor ferroelectric Pb[(MgNb) Ti ]O with = 0.30 using neutron scattering methods.

Nonvolatile and Reversible Ferroelectric Control of Electronic Properties of BiTe Topological Insulator Thin Films Grown on Pb(MgNb)O-PbTiO Single Crystals.

Single-phase (00 l)-oriented BiTe topological insulator thin films have been deposited on (111)-oriented ferroelectric 0.71Pb(MgNb)O-0.29PbTiO (PMN-PT) single-crystal substrates.

A Novel Magnetoelectric Biomagnetic Susceptometer on Iron Level Detection with Mice Tissue .

Iron plays a vital role in human body. Liver Iron Concentration (LIC) is directly correlated to total body iron and can be an important indicator to a variety of pathologies. Non-invasive methods to quantitatively assess tissue iron with low cost and high sensitivity have drawn vast interests and investments.

Integration of Oxide Semiconductor Thin Films with Relaxor-Based Ferroelectric Single Crystals with Large Reversible and Nonvolatile Modulation of Electronic Properties.

We report the fabrication of 0.71Pb(MgNb)O-0.29PbTiO (PMN-0.

Acoustic Anomalies and Phase Transition Behaviors of Lead-Free Piezoelectric (NaBi)TiO₃-BaTiO₃ Single Crystals as Revealed by Brillouin Light Scattering.

The elastic properties of unpoled and prepoled (NaBi)TiO₃-BaTiO₃ (NBT-BT) single crystals near the morphotropic phase boundary were investigated as a function of temperature using Brillouin light scattering. The acoustic mode frequency and the related acoustic damping of unpoled NBT-BT showed very broad minimum and maximum, respectively, consistent with typical relaxor behaviors. The frequency softening of the longitudinal acoustic mode together with the increase in acoustic damping was largest along the <100> direction, indicating that polarization fluctuations were most substantial along this crystallographic direction.

Nanopillars with E-field accessible multi-state (N ≥ 4) magnetization having giant magnetization changes in self-assembled BiFeO-CoFeO/Pb(MgNb)-38at%PbTiO heterostructures.

We have deposited self-assembled BiFeO-CoFeO (BFO-CFO) thin films on (100)-oriented SrRuO-buffered Pb(MgNb)TiO (PMN-38PT) single crystal substrates. These heterostructures were used for the study of real-time changes in the magnetization with applied DC electric field (E ). With increasing E , a giant magnetization change was observed along the out-of-plane (easy) axis.

Fatty acid oxidation alleviates the energy deficiency caused by the loss of MPC1 in MPC1 mice.

Pyruvate is a central substrate in energy metabolism, paramount to carbohydrate, fat, and amino acid catabolic and anabolic pathways. Mitochondrial pyruvate carrier 1(MPC1) is one important component of the complex that facilitates mitochondrial pyruvate import. Complete MPC1 deficiency is a serious concern, and has been shown to result in embryonic lethality in mice.

Large Electrocaloric Effect in Lead-Free (BaCa)(ZrTi)O₃ Ceramics Prepared via Citrate Route.

The 1 wt % Li-doped (BaCa)(ZrTi)O₃ (BCZT-Li) ceramics prepared by the citrate method exhibit improved phase purity, densification and electrical properties, which provide prospective possibility to develop high-performance electrocaloric materials. The electrocaloric effect was evaluated by phenomenological method, and the BCZT-Li ceramics present large electrocaloric temperature change ∆, especially large electrocaloric responsibility = ∆/∆, which can be comparable to the largest values reported in the lead-free piezoelectric ceramics. The excellent electrocaloric effect is considered as correlating with the coexistence of polymorphic ferroelectric phases, which are detected by the Raman spectroscopy.