Synthesis and conductivity of GdPO4 nanorods: Impacts of particle size and Ca2+ doping

Wang, Heng; Li, Guangshe; Guan, Xiangfeng

doi:10.1016/j.jallcom.2011.01.028

Cited by 17 publications

(14 citation statements)

References 44 publications

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“…Clearly, the cubic lattice parameters with pyrochlore-phase structure display a rapid increase for x ≤ 0.05, and then gradual decrease for x ≥ 0.1, whereas the lattice parameters of the samples with defect fluorite structure are nearly half of the corresponding pyrochlore value. Since Ca 2+ possesses similar ionic radius to Gd 3+ other than Zr 4+ 36 – 38 , the excess Ca 2+ tends to be arranged in A-site. The substitution of Gd 3+ by a fraction of Ca 2+ is favorable to the pyrochlore-phase structure as the ionic radius of Ca 2+ is slightly larger than that of Gd 3+ 36 , 37 , which makes the ionic radius ratio of r(Gd 3+ -Ca 2+ ) average /r(Zr 4+ ) larger than 1.46 and inevitably creates larger A-site volume.…”

Section: Resultsmentioning

confidence: 99%

“…Since Ca 2+ possesses similar ionic radius to Gd 3+ other than Zr 4+ 36 – 38 , the excess Ca 2+ tends to be arranged in A-site. The substitution of Gd 3+ by a fraction of Ca 2+ is favorable to the pyrochlore-phase structure as the ionic radius of Ca 2+ is slightly larger than that of Gd 3+ 36 , 37 , which makes the ionic radius ratio of r(Gd 3+ -Ca 2+ ) average /r(Zr 4+ ) larger than 1.46 and inevitably creates larger A-site volume. However, Ca 2+ can only substitute for a fraction of Gd 3+ because the extent of lattice distortion of pyrochlore structure is limited.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Alkaline-Earth Metals-Doped Pyrochlore Gd2Zr2O7 as Oxygen Conductors for Improved NO2 Sensing Performance

Zhong

Zhao

Shi

et al. 2017

Sci Rep

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This work proposed a novel strategy to fabricate highly-stable NO2 sensor based on a pyrochlore-phase Gd2Zr2O7 oxygen conductor. The incorporation of alkaline-earth metals distinctly enhances the sensing performance of the Gd2Zr2O7 based sensors. The excellent sensor based on Gd1.95Ca0.05Zr2O7+δ exhibits rapid response-recovery characteristics with the maximum response current value (ΔI = 6.4 μA), extremely short 90% responce (3 s) and 90% recovery (35 s) time towards 500 ppm NO2 at 500 °C, which is better than that of commercial YSZ under the same condition. The ΔI value towards NO2 is much higher than those towards other gases (CH4, C3H6, C3H8, CO, NO, SO2, C2H4, CO2 and C2H6), exhibiting excellent selectivity for detecting NO2. The response signal basically maintains a stable value of 6.4 μA after the sensors was stored for half a month and a month. The outstanding selectivity and highly stability of the NO2 sensors based on Gd2−xMxZr2O7+δ are expected to a promising application in automotive vehicles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Alkaline-Earth Metals-Doped Pyrochlore Gd2Zr2O7 as Oxygen Conductors for Improved NO2 Sensing Performance

Zhong

Zhao

Shi

et al. 2017

Sci Rep

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show abstract

“…39 Using K e = 4.3 Â 10 À4 S m À1 determined in the previous section, eqn (23) leads then to Da 0 /k B T E 10 À13 m 2 V À2 and therefore B 0 0 = 10 À9 m V À2 { B exp 0 E 10 À6 m V À2 as reported in Fig. 39 Using K e = 4.3 Â 10 À4 S m À1 determined in the previous section, eqn (23) leads then to Da 0 /k B T E 10 À13 m 2 V À2 and therefore B 0 0 = 10 À9 m V À2 { B exp 0 E 10 À6 m V À2 as reported in Fig.…”

Section: B Determination Of the Kerr Coefficient And Comparison Withmentioning

confidence: 99%

Electric field induced birefringence in non-aqueous dispersions of mineral nanorods

et al. 2015

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Lanthanum phosphate (LaPO4) nanorods dispersed in the non-aqueous solvent of ethylene glycol form a system exhibiting large intrinsic birefringence, high colloidal stability and the ability to self-organize into liquid crystalline phases. In order to probe the electro-optical response of these rod dispersions we study here the electric-field-induced birefringence, also called Kerr effect, for a concentrated isotropic liquid state with an in-plane a.c. sinusoidal electric field, in conditions of directly applied (electrodes in contact with the sample) or externally applied (electrodes outside the sample cell) fields. Performing an analysis of the electric polarizability of our rod-like particles in the framework of Maxwell-Wagner-O'Konski theory, we account quantitatively for the coupling between the induced steady-state birefringence and the electric field as a function of the voltage frequency for both sample geometries. The switching time of this non-aqueous transparent system has been measured, and combined with its high Kerr coefficients and its features of optically isotropic "off-state" and athermal phase behavior, this represents a promising proof-of-concept for the integration of anisotropic nanoparticle suspensions into a new generation of electro-optical devices.

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“…Wang and co‐workers have synthesized nanorod‐like Ca 2+ doped GdPO 4 by hydrothermal process at 160 °C for 12 h with different pH values. The pH only modified the nanorods sizes and GdPO 4 exhibited the hexagonal phase . Zhang et al have prepared GdPO 4 by another hydrothermal process at 220 °C for 17 h with pH 2 and obtained nanowires with monoclinic phase.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of lanthanide‐doped GdPO₄ nanowires and nanoparticles for optical applications

Garrido-Hernández

Boyer

Potdevin

et al. 2014

Physica Status Solidi (a)

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In this work, Eu3+ and Tb3+ doped GdPO4 nanocrystals, with different shapes were successfully synthetized by an original hydrothermal method. The particles morphology was modified changing the pH value and using glycerol as co‐solvent in the synthesis. Depending on the synthesis conditions, TEM analyses have revealed the achievements of nanowires and nanoparticles with narrow size distributions. Their structural, morphological, and photoluminescent properties were investigated and compared. Luminescent composite films based on silicone polymer were prepared using GdPO4:Eu3+ and GdPO4:Tb3+ with different morphology as filler.

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Synthesis and conductivity of GdPO4 nanorods: Impacts of particle size and Ca2+ doping

Cited by 17 publications

References 44 publications

Alkaline-Earth Metals-Doped Pyrochlore Gd2Zr2O7 as Oxygen Conductors for Improved NO2 Sensing Performance

Alkaline-Earth Metals-Doped Pyrochlore Gd2Zr2O7 as Oxygen Conductors for Improved NO2 Sensing Performance

Electric field induced birefringence in non-aqueous dispersions of mineral nanorods

Hydrothermal synthesis of lanthanide‐doped GdPO₄ nanowires and nanoparticles for optical applications

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Synthesis and conductivity of GdPO4 nanorods: Impacts of particle size and Ca2+ doping

Cited by 17 publications

References 44 publications

Alkaline-Earth Metals-Doped Pyrochlore Gd2Zr2O7 as Oxygen Conductors for Improved NO2 Sensing Performance

Alkaline-Earth Metals-Doped Pyrochlore Gd2Zr2O7 as Oxygen Conductors for Improved NO2 Sensing Performance

Electric field induced birefringence in non-aqueous dispersions of mineral nanorods

Hydrothermal synthesis of lanthanide‐doped GdPO4 nanowires and nanoparticles for optical applications

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Product

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Hydrothermal synthesis of lanthanide‐doped GdPO₄ nanowires and nanoparticles for optical applications