Formation of 2D-Layered (CH3NH3)3Sb2I9 Lead-Free Perovskite Phase from CH3NH3I and SbSI: Photodetection Activity in Carbon Based Lateral Devices

Author(s):  
Amit Kumar Pathak ◽  
Sudip K. Batabyal
2016 ◽  
Vol 675-676 ◽  
pp. 544-547
Author(s):  
Supalak Manotham ◽  
Thanatep Phatungthane ◽  
Tawee Tunkasiri ◽  
Komsanti Chokethawat

The properties of modified Bi0.5Na0.5TiO3 (BNT) based lead-free ceramics were investigated. The BNT-based ceramics were prepared by a two-steps sintering method. The ceramics were sintered at T1=1373 K and T2= 1173 K for various dwell times (0, 2, 4, and 8h). The properties of the ceramics were characterized by many techniques. The ceramic samples exhibited a pure perovskite phase with rhombohedral symmetry. The microstructural analysis by a scanning electron microscopy (SEM), indicated that all ceramics had a similar microstructure. Piezoelectric and mechanical properties of the ceramics were improved at a suitable dwell time at T2.


2012 ◽  
Vol 512-515 ◽  
pp. 1385-1389 ◽  
Author(s):  
Wang Feng Bai ◽  
Wei Li ◽  
Bo Shen ◽  
Ji Wei Zhai

Lead-free piezoelectric ceramics, (Ba0.85-xSrxCa0.15)(Zr0.1Ti0.9)O3 (BSCZT, x=0.01-0.07), were prepared via a solid-state reaction route. The dielectric properties, ferroelectric properties, piezoelectric and strain properties of BSCZT ceramics were studied. The phase structure and microstructure were investigated by X-ray diffraction and scanning electron microscope, respectively. Results showed that dense ceramics with pure perovskite phase were obtained. At room temperature, the samples with x=0.03 exhibited excellent properties with large piezoelectric coefficient d33=534pC/N, planar mode electromechanical coupling coefficient kp=47.7%, thickness mode electromechanical coupling coefficient kt= 42% and high strain levels of 0.34%. In addition, the study of electrical properties suggested that the Curie temperature decreased linearly from 92oc to 73oc with the increasing doping content of strontium in BCZT ceramics. The remnant polarizations, piezoelectric coefficient and strain levels were all increased as the Sr content increased and then decreased with further increased Sr doping level, giving the maximum values at the Sr content of 3mol%. These results indicated that the BSCZT system is a promising lead-free material for applications in the future.


2020 ◽  
Vol 91 (2) ◽  
pp. 20905
Author(s):  
Satyanarayan Patel ◽  
Manish Kumar

In the present work, the electrocaloric (EC) effect in lead-free Sr and Sn doped (Ba0.85Ca0.075Sr0.075)(Zr0.1Ti0.88Sn0.02)O3 ceramic prepared by solid-state method has been investigated. The phase purity and pure perovskite phase formation with Sr and Sn doping is confirmed by X-ray diffraction. The adiabatic temperature change ΔT (due to the EC effect), entropy change (ΔS) and refrigeration capacity (RC) are estimated under various electric fields. The maximum peak values of ΔT, ΔS and RC are found as 1.5 K, 1.8 J/kg.K and 2.75 J/kg, respectively under the applied electric field of 33 kV/cm at 305 K. It is also observed that the ΔT, ΔS and RC decreases with an increase in applied temperature. Moreover, the estimated values of EC properties are significantly high which indicates that fabrication of Sr and Sn doped lead-free ceramics can be advantageous for EC applications.


2017 ◽  
Vol 56 (44) ◽  
pp. 13819-13823 ◽  
Author(s):  
Cheng-Min Tsai ◽  
Nayantara Mohanta ◽  
Chi-Yung Wang ◽  
Yu-Pei Lin ◽  
Yaw-Wen Yang ◽  
...  

2020 ◽  
Vol 12 (42) ◽  
pp. 47408-47415 ◽  
Author(s):  
Jiabao Li ◽  
Jialong Duan ◽  
Jian Du ◽  
Xiya Yang ◽  
Yudi Wang ◽  
...  

2017 ◽  
Vol 129 (44) ◽  
pp. 14007-14011 ◽  
Author(s):  
Cheng-Min Tsai ◽  
Nayantara Mohanta ◽  
Chi-Yung Wang ◽  
Yu-Pei Lin ◽  
Yaw-Wen Yang ◽  
...  

2013 ◽  
Vol 575-576 ◽  
pp. 494-498 ◽  
Author(s):  
Bin Fu ◽  
Yang Lu Hou ◽  
Ting Li ◽  
Xing Hua Fu

Lead-free Sr-and Mn-doped Ca1-xSrxBi4Ti4O15, Ca1-yMnyBi4Ti4O15 bismuth layer piezoelectric ceramics have been prepared. The microstructure and electrical properties of the products were studied by XRD, SEM and Broadband LRC digital bridge. The obtained ceramics have Bi-layer perovskite phase. The dopings do not change the crystal phase of CaBi4Ti4O15. However, the doping amounts affect the size of crystal grain and porosity of the final products. The appropriate amounts of dopings for obtaining the highest dielectric constant and the lowest dielectric loss are determined. The prepared ceramics show the largest piezoelectric constant of 5.2~5.3 pC/N with the optimal Sr-and Mn-dopings.


2010 ◽  
Vol 43 ◽  
pp. 614-618
Author(s):  
Xin You Huang ◽  
Chun Hua Gao ◽  
Min Xian Wei ◽  
Zhi Gang Chen

0.85(Na0.5Bi0.5)TiO3-0.144(K0.5Bi0.5)TiO3-0.006BaTiO3(NBT-KBT-BT) lead-free piezo -electric ceramics were prepared using conventional solid state method. The influence of La2O3 doping amount on the crystal phase, surface microstructure and properties of the NBT-KBT-BT lead free piezoelectric ceramics were investigated using X-ray diffraction(XRD), Scanning electron microscopy(SEM) and other analytical methods. The results show that La2O3 has diffused into the lattice of NBT-KBT-BT ceramics. Consequently, a pure perovskite phase is formed. SEM images show that the microstructure of the ceramics is changed with the addition of a small amount of La2O3, La2O3 doping can make grain growing. The piezoelectric strain constant(d33) starts increasing and then decreasing, the dielectric constant(εT33/ε0) increases continuously and the dielectric loss(tanδ) starts increasing and then decreasing and then increasing when La2O3 doping amount increases. When the doping amount of La2O3 is 0.4wt.% and the sintering temperature is 1160°C, the NBT-KBT-BT piezoelectric ceramics with good comprehensive properties can be obtained. Its piezoelectric strain constant(d33), dielectric constant(εT33/ε0), and dielectric loss(tanδ) are 151pC/N, 1543 and 4.2%, respectively.


Author(s):  
Reenu Jacob ◽  
Harikrishnan G. Nair ◽  
Jayakumari Isac

The development of lead-free piezoelectric materials have gained great attention for the consideration of environmental protection. Nanosized BaSr0.9Fe0.1TiO4, a lead free perovskite phase structured ceramic was prepared via a high-energy ball milling process through mechanically assisted synthesis. The sample was analyzed by X-ray Diffraction (XRD), SEM and EDX. The XRD results and XPERT-PRO software analysis confirmed the orthorhombic system of the sample. Scanning Electron Microscopy (SEM) analysis revealed that its crystallite size is in the nanometer range. The grain size was less than 100 nm and showed a strong tendency for agglomeration. It also confirmed with the calculated value from Debye Scherrer’s formula. EDX spectrum shows the elemental composition of the sample. Williamson-Hall Plot method was used to evaluate the size and lattice strain. The dislocation density and the morphology index of the sample were also calculated.


Author(s):  
Nguyen TruongTho

The <em>(1-x)</em>BiFe<sub>0</sub><sub>.91</sub>(Mn<sub>0</sub><sub>.47</sub>Ti<sub>0.53</sub>)<sub>0.09</sub>O<sub>3</sub>–<em>x</em>BaTiO<sub>3</sub> (BFMT–BT) lead-free ceramics have been fabricated by the conventional solid-state reaction method. The phase structure of BFMT-BT investigated by <em>X</em>–ray diffraction shows a single perovskite phase. Although 20% mol of Bi<sub>2</sub>O<sub>3</sub> was added to the raw materials, the evaporation of Bi<sup>3+</sup> ions during calcining and sintering processes is from 20 to 30% wt. relative to other elements. The effect of BaTiO<sub>3</sub>content on electrical properties of BFMT-BT ceramic has been investigated. At BaTiO<sub>3</sub>concentration of 0.3 mol and the sintering temperature of 950<sup>o</sup>C, electrical properties of ceramics are best with the density (<em>r</em>) of 7.6 g/cm<sup>3</sup>, the electromechanical coupling factor (<em>k<sub>p</sub></em>) of 0.28, the dielectric constant (<em>ε<sub>r</sub></em>) of 1028, and the difference in polarizations at zero field is about 10.5 mC/cm<sup>2</sup>.


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