Electro-caloric effect in lead-free Sn doped BaTiO3 ceramics at room temperature and low applied fields

2014 ◽  
Vol 105 (11) ◽  
pp. 112907 ◽  
Author(s):  
Sanjay Kumar Upadhyay ◽  
V. Raghavendra Reddy ◽  
Pallab Bag ◽  
R. Rawat ◽  
S. M. Gupta ◽  
...  
Keyword(s):  
Room Temperature ◽  
Lead Free ◽  
Caloric Effect ◽  
Applied Fields

Room temperature electro-caloric effect in lead-free Ba(Zr 0.1 Ti 0.9 ) 1−x Sn x O 3 ( x =0, x =0.075) ceramics

2015 ◽  
Vol 201 ◽  
pp. 64-67 ◽  
Author(s):  
H. Kaddoussi ◽  
Y. Gagou ◽  
A. Lahmar ◽  
J. Belhadi ◽  
B. Allouche ◽  
...  
Keyword(s):  
Room Temperature ◽  
Lead Free ◽  
Caloric Effect

Electrocaloric properties of lead-free ferroelectric ceramic near room temperature

2021 ◽  
Vol 127 (6) ◽  
Author(s):  
Hend Kacem ◽  
Ah. Dhahri ◽  
Mohamed Amara Gdaiem ◽  
Z. Sassi ◽  
L. Seveyrat ◽  
...  
Keyword(s):  
Room Temperature ◽  
Ferroelectric Ceramic ◽  
Lead Free

Enhanced electrocaloric strengths at room temperature in (SrxBa1−x)(Sn0.05Ti0.95)O3 lead-free ceramics

2021 ◽  
Vol 871 ◽  
pp. 159519
Author(s):  
Sheng-Guo Lu ◽  
Xiongwei Lin ◽  
Jiang Li ◽  
Dandan Li ◽  
Yingbang Yao ◽  
...  
Keyword(s):  
Room Temperature ◽  
Lead Free ◽  
Lead Free Ceramics

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.

Near room temperature magneto caloric effect in V doped La0.67Ca0.33MnO3 ceramics

2009 ◽  
Vol 478 (1-2) ◽  
pp. 566-571 ◽  
Author(s):  
P. Nisha ◽  
P.N. Santhosh ◽  
K.G. Suresh ◽  
C. Pavithran ◽  
Manoj Raama Varma
Keyword(s):  
Room Temperature ◽  
Caloric Effect

Near room temperature magneto-caloric effect of a Gd 48 Co 52 amorphous alloy

2016 ◽  
Vol 658 ◽  
pp. 598-602 ◽  
Author(s):  
Z.W. Wang ◽  
P. Yu ◽  
Y.T. Cui ◽  
L. Xia
Keyword(s):  
Amorphous Alloy ◽  
Room Temperature ◽  
Caloric Effect

Large electrocaloric efficiency over a broad temperature span in lead-free BaTiO3-based ceramics near room temperature

2017 ◽  
Vol 111 (20) ◽  
pp. 202902 ◽  
Author(s):  
Tangyuan Li ◽  
Xinyu Liu ◽  
Sheng Shi ◽  
Yihao Yin ◽  
Hongfa Li ◽  
...  
Keyword(s):  
Room Temperature ◽  
Lead Free

Effect of Sintering Temperature on Structure and Dielectric Properties of Lead Free K0.5Na0.5NbO3 Prepared via Hot Isostatic Pressing

2017 ◽  
Vol 888 ◽  
pp. 42-46 ◽  
Author(s):  
Fatin Khairah Bahanurdin ◽  
Julie Juliewatty Mohamed ◽  
Zainal Arifin Ahmad
Keyword(s):  
Grain Size ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Hot Isostatic Pressing ◽  
Solid State Reaction Method ◽  
Lead Free ◽  
Tangent Loss ◽  
Isostatic Pressing ◽  
Tan Δ

In this research, alkaline niobate known as K0.5Na0.5NbO3 (KNN) lead-free piezoelectric ceramic was synthesis by solid state reaction method which pressing at different sintering temperatures (1000 °C and 1080 °C) prepared via hot isostatic pressing (HIP)). The effect of sintering temperature on structure and dielectric properties was studied. The optimum sintering temperature (at 1080 °C for 30 minutes) using hot isostatic pressing (HIP) was successfully increase the density, enlarge the particle grain size in the range of 0.3 µm – 2.5 µm and improves the dielectric properties of K0.5Na0.5NbO3 ceramics. The larger grain size and higher density ceramics body will contribute the good dielectric properties. At room temperature, the excellent relative permittivity and tangent loss recorded at 1 MHz (ɛr = 5517.35 and tan δ = 0.954), respectively for KNN1080HIP sample. The KNN1080HIP sample is also exhibits highest relative density which is 4.485 g/cm3. The ɛr depends upon density and in this work, the density increase as the sintering temperature increase, which resulting the corresponding ɛr value also increases.

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