A systematic modification of the large electrocaloric effect within a broad temperature range in rare-earth doped BaTiO3 ceramics

2016 ◽  
Vol 4 (9) ◽  
pp. 1842-1849 ◽  
Author(s):  
Fei Han ◽  
Yang Bai ◽  
Li-Jie Qiao ◽  
Dong Guo
Keyword(s):  
Rare Earth ◽  
Broad Temperature Range ◽  
Electrocaloric Effect ◽  
Temperature Range ◽  
Systematic Exploration ◽  
Rare Earth Doped ◽  
Rare Earth Substitution

This paper presents a systematic exploration of modifying the electrocaloric effect (ECE) in BaTiO3 ceramics by rare-earth substitution (Ba0.94R0.04TiO3, R = La, Ce, Nd, Sm, Eu, Gd, Dy, Er).

scholarly journals Physical Background for Luminescence Thermometry Sensors Based on Pr3+:LaF3 Crystalline Particles

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Maksim S. Pudovkin ◽  
Oleg A. Morozov ◽  
Vitaly V. Pavlov ◽  
Stella L. Korableva ◽  
Elena V. Lukinova ◽  
...  
Keyword(s):  
Rare Earth ◽  
Temperature Dependent ◽  
Oh Groups ◽  
Physiological Temperature ◽  
Temperature Range ◽  
Thermal Sensing ◽  
Physical Background ◽  
Rare Earth Doped ◽  
Microcrystalline Powder ◽  
Two Temperature

The main goal of this study was creating multifunctional nanoparticles based on rare-earth doped LaF3 nanocrystals, which can be used as fluorescence thermal sensors operating over the 80–320 K temperature range including physiological temperature range (10–50°C). The Pr3+:LaF3 (CPr = 1%) microcrystalline powder and the Pr3+:LaF3 (CPr = 12%, 20%) nanoparticles were studied. It was proved that all the samples were capable of thermal sensing into the temperature range from 80 to 320 K. It was revealed that the mechanisms of temperature sensitivity for the microcrystalline powder and the nanoparticles are different. In the powder, the 3P1 and 3P0 states of Pr3+ ion share their electronic populations according to the Boltzmann and thermalization of the 3P1 state takes place. In the nanoparticles, two temperature dependent mechanisms were suggested: energy migration within 3P0 state in the temperature range from 80 K to 200 K followed by quenching of 3P0 state by OH groups at higher temperatures. The values of the relative sensitivities for the Pr3+:LaF3 (CPr = 1%) microcrystalline powder and the Pr3+:LaF3 (CPr = 12%, 20%) nanoparticles into the physiological temperature range (at 45°C) were 1, 0.5, and 0.3% °C−1, respectively.

Large electrocaloric effect over a wide temperature range in BaTiO3-modified lead-free ceramics

2019 ◽  
Vol 7 (5) ◽  
pp. 1353-1358 ◽  
Author(s):  
Luo Zhao ◽  
Xiaoqin Ke ◽  
Zhijian Zhou ◽  
Xiaoqi Liao ◽  
Junjie Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Wide Temperature Range ◽  
Diffuse Phase Transition ◽  
Lead Free ◽  
Broad Temperature Range ◽  
Electrocaloric Effect ◽  
Temperature Range ◽  
Lead Free Ceramics ◽  
Diffuse Phase

BT-13CH exhibits a large electrocaloric effect over a broad temperature range because of multiphase coexistence (MPC) with diffuse phase transition (DPT) character.

Effect of Rare-Earth Cation Doping on Enhancement of The Thermoelectric Power of Zinc Oxide

2005 ◽  
Vol 886 ◽  
Author(s):  
Kiyoshi Fuda ◽  
Shigeaki Sugiyama
Keyword(s):  
Rare Earth ◽  
Thermoelectric Power ◽  
Rare Earth Ions ◽  
Rare Earth Doping ◽  
Rare Earth Cation ◽  
Temperature Range ◽  
Seebeck Coefficients ◽  
Earth Cation ◽  
Doped Zno ◽  
Rare Earth Doped

ABSTRACTWe investigated the effects of doping of rare-earth ions (Ce, Pr, Nd, Sm, and Eu) on the thermoelectric properties of ZnO, especially Seebeck coefficient in the temperature range from 100 to 800 °C. The data were scattered more or less depending on the doping species, but it was commonly found that the rare-earth doped samples showed higher Seebeck coefficients with compared to those for Al-doped samples. The highest values were observed for Nd-doped one ranging from -360 to -400μVK−1 in the temperature range observed, the lowest ones for Pr-doped one ranging from -250 to -310 μVK−1, whereas those for Al-doped one ranging from -80 to -140 μVK−1. It should also be pointed out that the power factor at 100 °C for Pr-doped ZnO was twice or more as much as that for Al-doped one. From the results it seemed that rare earth doping is effective for enhancement of thermoelectric power of ZnO.

Waveguide amplifiers in rare-earth doped glasses : fabrication, characterisation [MATH] modelling

1994 ◽  
Vol 04 (C4) ◽  
pp. C4-277-C4-280 ◽  
Author(s):  
B. HYDE ◽  
D. BARBIER ◽  
J. HUBNER ◽  
J.-M. JOUANNO ◽  
A. KEVORKIAN ◽  
...  
Keyword(s):  
Rare Earth ◽  
Waveguide Amplifiers ◽  
Doped Glasses ◽  
Rare Earth Doped
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