scholarly journals Pyroelectric properties of 91.5Na0.5Bi0.5TiO3–8.5K0.5Bi0.5TiO3 lead-free single crystal

2021 ◽  
Author(s):  
Bo Zhang ◽  
Renbing Sun ◽  
Fang Wang ◽  
Tangfu Feng ◽  
Pengna Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Frequency Dependence ◽  
Room Temperature ◽  
Pyroelectric Coefficient ◽  
Lead Free ◽  
Oriented Crystal ◽  
Depolarization Temperature ◽  
Pyroelectric Properties ◽  
Figures Of Merit ◽  
Crystallographic Orientations

The dielectric and pyroelectric performances of 91.5Na[Formula: see text]Bi[Formula: see text]TiO3–8.5K[Formula: see text]Bi[Formula: see text]TiO3 lead-free single crystal were investigated. The depolarization temperature of the crystal is about 153[Formula: see text]C. Among the [Formula: see text]001[Formula: see text], [Formula: see text]110[Formula: see text], and [Formula: see text]111[Formula: see text] crystallographic orientations, the [Formula: see text]111[Formula: see text]-oriented crystal possesses the highest pyroelectric coefficient and the largest figures of merit, and the values of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]are 5.63× 10[Formula: see text] C/m2 ⋅ K, 0.06 m2/C, and 21.5 [Formula: see text]Pa[Formula: see text] for the [Formula: see text]111[Formula: see text]-oriented crystal at room temperature. The [Formula: see text]and [Formula: see text]exhibit weak frequency dependence in the range of 100–300 Hz. With the increase of the temperature, the value of [Formula: see text]increases, while the [Formula: see text] value of [Formula: see text] decreases from 18[Formula: see text]C to 103 [Formula: see text]C.

GROWTH AND CHARACTERIZATION OF Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3 LEAD-FREE PIEZOELECTRIC CRYSTAL BY THE TSSG METHOD

2011 ◽  
Vol 01 (02) ◽  
pp. 237-242 ◽  
Author(s):  
RENBING SUN ◽  
DI LIN ◽  
QINHUI ZHANG ◽  
BIJUN FANG ◽  
HAIWU ZHANG ◽  
...  
Keyword(s):  
Single Crystal ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Thermal Hysteresis ◽  
Dielectric Behavior ◽  
Lead Free ◽  
Electromechanical Coupling Coefficient ◽  
Diffraction Measurement ◽  
Oriented Crystal ◽  
X Ray

The 0.96Na0.5Bi0.5TiO3–0.04K0.5Bi0.5TiO3 (NKBT96/4) lead-free single crystal was successfully grown by top-seeded solution growth method. The effective segregation coefficient for K was calculated to be 0.20. X-ray powder diffraction measurement showed that the as-grown crystal possesses rhombohedral perovskite structure at room temperature. X-ray rock curve measure indicated that the as-grown single crystal owned relatively higher quality. The NKBT96/4 single crystal exhibits apparent diffused dielectric behavior, where the diffusiveness index α is 1.79 for the [001]-oriented crystal planes. A notable thermal hysteresis, ΔT h , of 25°C was disclosed for the tetragonal antiferroelectric-tetragonal paraelectric phase transition in the dielectric property studies between heating and cooling. The highest remnant polarization, P r , 16.8 μC/cm2, was obtained at 100°C. The electromechanical coupling coefficient kt of the [001]-oriented crystal planes at room temperature was determined to be 38% using resonance–antiresonance technique. The room temperature piezoelectric constant d33 reaches 120 pC/N.

The Characteristic of the La3Ga5SiO14 Single Crystal Grown by Vertical Bridgman Method in Ar Atmosphere

2006 ◽  
Vol 510-511 ◽  
pp. 842-845 ◽  
Author(s):  
Noriko Bamba ◽  
Kentaro Kato ◽  
Toshinori Taishi ◽  
Takayuki Hayashi ◽  
Keigo Hoshikawa ◽  
...  
Keyword(s):  
Melting Point ◽  
Single Crystal ◽  
Single Crystals ◽  
Room Temperature ◽  
Color Change ◽  
Piezoelectric Materials ◽  
Lead Free ◽  
Piezoelectric Constant ◽  
Interstitial Oxygen ◽  
Vertical Bridgman

Langasite (La3Ga5SiO14: denoted by LGS) single crystal is one of the lead free piezoelectric materials with high piezoelectricity that is maintained up to its melting point (1470°C). Although LGS single crystals have usually been grown by Czochralski (CZ) method in oxygen contained atmosphere to prevent evaporation of Ga, they were grown by the vertical Bridgman (VB) method in Ar atmosphere without oxygen, and their properties were evaluated in this work. Transparent and colorless LGS single crystals were successfully obtained without Ga evaporation by the VB method in Ar atmosphere, and their resistivity at room temperature was much higher than that grown by conventional CZ method. Piezoelectric constant d11 of the crystal grown by the VB method was 6 x 10-12 C/N, which was close to that of the crystal grown by CZ method. The colorless transparent LGS single crystal turned to orange and its resistivity decreased by annealing in air. Since an orange-colored transparent LGS single crystal has been grown by conventional CZ method, this indicates that color change and the resistivity decrease of LGS crystal is caused by extra interstitial oxygen atoms in the crystal.

scholarly journals Comparative study on the performance of piezo-active 1–3-type composites with lead-free components

2021 ◽  
pp. 2160003
Author(s):  
Ashura N. Isaeva ◽  
Vitaly Yu. Topolov
Keyword(s):  
Single Crystal ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Volume Fraction ◽  
Lead Free ◽  
Figures Of Merit ◽  
Piezoelectric Energy ◽  
Harvesting Systems ◽  
Porous Matrices ◽  
Large Anisotropy

Piezoelectric properties and related figures of merit are studied in novel 1–3-type composites based on ferroelectric domain-engineered lead-free single crystal with the relatively large longitudinal piezoelectric coefficient [Formula: see text]. Relationships between the piezoelectric properties and the set of figures of merit are analyzed for the 1–3 and 1–3–0 composites that contain the same single-crystal and polymer components. For a composite characterized by 1–3–0 connectivity, an influence of a porous piezo-passive matrix on the figures of merit and their volume-fraction behavior is considered additionally. A large anisotropy of figures of merit is observed in the 1–3–0 composite with specific porous matrices. A diagram is put forward to show volume-fraction regions of the large anisotropy of figures of merit of the studied 1–3–0 composite. Due to large figures of merit and their considerable anisotropy, the studied lead-free composites can be applied in piezoelectric energy-harvesting systems, sensors, transducers, and so on.

Pyroelectric Properties of the Plt(10) Thin Film on the P-Doped Poly Silicon

1996 ◽  
Vol 433 ◽  
Author(s):  
Seong Jun Kang ◽  
Yung Sup Yoon ◽  
Dong Il Kim
Keyword(s):  
Thin Film ◽  
Dielectric Constant ◽  
Curie Temperature ◽  
Room Temperature ◽  
Sol Gel ◽  
Pyroelectric Coefficient ◽  
Pyroelectric Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
Poly Silicon

AbstractWe have studied the pyroelectric properties of the PLT(10) thin film deposited on a p-doped poly-Si electrode by using the sol-gel method. Measurement of the dielectric constant as a function of temperature shows the typical characteristics of a ferroelectric. The dielectric constant reaches a maximum at 295°C, which can be thought of as the Curie temperature. The PLT(10) thin film on p-doped poly-Si fabricated in this research shows excellent pyroelectric properties. The pyroelectric coefficient and the fiqures of merit, Fv and FD at room temperature are measured as 5.76 × 10−8 C/cm2 °C, 1.17 × 10−10C-cm/J and 0.93 × 10−8C-cm/J, respectively.

Dielectric and Pyroelectric Properties of Ammonium Hydrogen-DL-Malate Monohydrate, NH4(C4H5O5) H2O

1987 ◽  
Vol 42 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Silvia Fleck ◽  
Michael C. Böhm ◽  
Alarich Weiss
Keyword(s):  
Dipole Moment ◽  
Room Temperature ◽  
Pyroelectric Coefficient ◽  
Crystallographic Direction ◽  
Dielectric Tensor ◽  
Dielectric Measurements ◽  
Angular Variation ◽  
Pyroelectric Properties ◽  
Self Consistent ◽  
Ammonium Hydrogen

The dielectric and pyroelectric properties of ammonium hydrogen-DL-malate monohydrate NH⊕ (⊖OOCCHOHCH2COOH) • H20 were studied as a function of temperature and crystallographic direction. The components of the dielectric tensor at room temperature are within the limits 5.9 ≦ ε≦ 8.6. The pyroelectric coefficient |p| increases from ≈ 18 μC m-2 K-1 at T= 100 K to 32 μC m-2 K-1 at room temperature. The angular variation of p in the ac-plane of the crystal with symmetry Cc is ≈ 10°.Using an INDO procedure which includes crystal field effects in a self-consistent way (SCEF) the charge distribution in the solid was calculated. With the therefrom resulting dipole moment and together with the dielectric measurements the pyroelectric coefficient |p| and the change of |p| with temperature was calculated. Experiment and theoretical result agree satisfactory.

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