A New Elaboration Route by Sol-Gel Process for Cerium Doped SrHfO<sub>3</sub>Films and Powders

Villanueva-Ibáñez, Maricela; Luyer, Cécile Le; Parola, Stéphane; Marty, Olivier; Mugnier, J.

doi:10.1023/b:jsst.0000048003.58868.91

Cited by 27 publications

(23 citation statements)

References 5 publications

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“…One can see that starting from the highest illumination temperature, 347 K, the TSL glow curves become less intense as the illumination temperature progressively decreases. This observation nicely correlates with the expected decreasing probability of the center thermal ionization according to formula (4). Note that from illumination temperature 347 K down to 313 K we only observe one dominant TSL peak at about 410 K. As the illumination temperature decreases, a TSL peak at about 330 K appears.…”

Section: Study Of Ionization Of the Ce 3+ Excited State By Tslsupporting

confidence: 86%

“…Because of its high melting point (T m > 2400°C) the material is not available as a single crystal and therefore is currently being investigated in the form of nanocrystals [1,2] or ceramics obtained from crystalline powders prepared by solid-state synthesis [3]. Alternative techniques for the preparation of Ce-doped SHO powders are the sol-gel route [4,5] or acetate-citrate combustion [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Trapping states and excited state ionization of the Ce3+ activator in the SrHfO3 host

Mihóková¹,

Jarý²,

Fasoli³

et al. 2013

Chemical Physics Letters

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a b s t r a c tWe study trapping states of Ce 3+ -doped SrHfO 3 by thermally stimulated luminescence in a wide temperature range (10-730 K). We determine characteristic parameters of the traps by the initial rise technique. We also determine the energy of thermal ionization of the excited state of Ce 3+ in SrHfO 3 host by purely optical method based on the study of UV illumination-induced thermoluminescence. The method provides a value of the thermal ionization energy of about 0.25 eV.

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Section: Study Of Ionization Of the Ce 3+ Excited State By Tslsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Trapping states and excited state ionization of the Ce3+ activator in the SrHfO3 host

Mihóková¹,

Jarý²,

Fasoli³

et al. 2013

Chemical Physics Letters

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“…It has been studied in recent years by several groups [2][3][4][5][6]. The Ce 3+ doping at Sr 2+ site induces coulombic disbalance in the lattice and the compensation mechanism has not been understood so far.…”

Section: Introductionmentioning

confidence: 99%

SrHfO3-based phosphors and scintillators

et al. 2011

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a b s t r a c tThe heavily Ce-doped SrHfO 3 (SHO) and the undoped non-stoichiometric SHO sample sets were prepared by solid state reaction in powder form and their luminescence spectra and decay kinetics were measured. Concentration quenching effects and thermally induced ionization of the Ce 3+ excited states were followed and discussed in the former sample set. In the latter one new emission band at about 334 nm was found in Sr-deficient samples and temperature dependences of its emission intensity and decay times were studied in the detail. Room temperature decay time of about 180 ns and efficient and fast energy transfer from the host to the center of the 334 nm emission make this material promising candidate for X-ray phosphors.

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“…Por otro lado, se puede apreciar que conforme aumenta la temperatura desde 500 °C hasta 800 °C en la región comprendida entre 860 cm -1 y 390 cm -1 se hace presente una banda ancha que indica la formación del enlace M-O. Cuando la temperatura alcanza los 800ºC la banda es más definida y parecida a aquella reportada por Chen et al que correspondería a la vibración del ZrO 6 octaédrico [34], sin embargo, el aspecto de esta banda no es fina como regularmente se puede apreciar para materiales de este tipo [28], sino más bien ancha y centrada a aproximadamente 500 cm -1 . Lo anterior se debe a la contribución de otra vibración M-O, como lo es la del Zr-O del HfO 2 [36].…”

Section: Resultsunclassified

“…Alternativamente se han empleado otros métodos de química suave (Chimie Douce) que se llevan a cabo en condiciones de temperatura moderadas (T<700 K) aunque pueden presentar algunos problemas en el control de la reacción debido a las diferentes propiedades químicas de los cationes que pueden ocasionar dificultades en la estequiometría. Los procedimientos de obtención basados en la técnica sol-gel han sido probados como una buena opción para la obtención de materiales tipo perovskita [28] siempre que las condiciones de síntesis estén bien controladas [29]. Zhang et al emplearon un método sol-gel tipo Pechini para la elaboración de AZrO 3 :Eu en donde A= Ba, Sr o Ca [30], identificando una estructura ortorrómbica para el caso de zirconatos de calcio y de estroncio y cúbica para el caso de zirconato de bario.…”

Section: Introductionunclassified

Síntesis en medio poli-alcohólico y caracterización de Perovskitas BaHfO3 y BaZrO3

et al. 2013

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RESUMENLos materiales tipo perovskita (ABO 3 ) presentan considerable interés tecnológico, sus propiedades dependen de los elementos A y B que los sustituyan. Para la elaboración de materiales tipo perovskita se han empleado diversos métodos. En este trabajo se presentan los resultados obtenidos para el BaHfO 3 y BaZrO 3 utilizando la síntesis poliol. Se usaron sales inorgánicas disueltas en dietilenglicol y los materiales recuperados han sido tratados térmicamente a 700 °C y 900 °C. El análisis por difracción de rayos X reveló la estructura cúbica tipo perovskita y se observaron adicionalmente picos correspondientes a las fases secundarias de BaCO 3 y MO 2 (M=Hf o Zr) en ambos materiales. Los espectros obtenidos por FTIR pusieron en evidencia la presencia de BaCO 3 . Las observaciones por microscopía electrónica de barrido revelaron para ambos casos, materiales muy compactos conformados por sub-estructuras más pequeñas en forma de alambre de diámetro aproximado a 900 nm. Para temperaturas de calcinado entre 700 o C y 900 o C se observó un cambio remarcable en la morfología con materiales disgregados conformados por partículas más pequeñas. Los análisis en microscopía electrónica en transmisión revelaron que los materiales tratados a la mayor temperatura están constituidos por pequeños cristales inferiores a 15 nm.Palabras clave: BaHfO 3 , BaZrO 3 , método poliol, perovskita, materiales nanoestructurados. ABSTRACTPerovskite materials (ABO 3 ) present considerable technological interest, their properties depend on the A and B elements. A variety of methods have been used for the elaboration of perovskite materials. In the present paper we present the results of the BaHfO 3 and BaZrO 3 obtained by polyol method. Inorganic salts of barium and hafnium or zirconium were dissolved in di-etilenglicol and the products were heat treated at 700 °C and 900 °C. X-ray diffraction revealed the cubic structure perovskite-type and diffractions corresponding to the secondary phases of BaCO 3 and MO 2 (M=Hf or Zr). The spectra obtained by FTIR show the presence of BaCO 3 . At 700 °C, the scanning electronic microscopy observations revealed a very compact morphology conformed by smaller sub-structures in the form of wire with a diameter around to 900 nm. At 900 °C it was observed a remarkable change in the morphology with dispersed materials conformed by small particles. Transmission electronic microscopy showed that the materials annealed at 900 °C are constituted by small crystals with size lower than 15 nm.

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A New Elaboration Route by Sol-Gel Process for Cerium Doped SrHfO₃Films and Powders

Cited by 27 publications

References 5 publications

Trapping states and excited state ionization of the Ce3+ activator in the SrHfO3 host

Trapping states and excited state ionization of the Ce3+ activator in the SrHfO3 host

SrHfO3-based phosphors and scintillators

Síntesis en medio poli-alcohólico y caracterización de Perovskitas BaHfO3 y BaZrO3

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A New Elaboration Route by Sol-Gel Process for Cerium Doped SrHfO3Films and Powders

Cited by 27 publications

References 5 publications

Trapping states and excited state ionization of the Ce3+ activator in the SrHfO3 host

Trapping states and excited state ionization of the Ce3+ activator in the SrHfO3 host

SrHfO3-based phosphors and scintillators

Síntesis en medio poli-alcohólico y caracterización de Perovskitas BaHfO3 y BaZrO3

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Product

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A New Elaboration Route by Sol-Gel Process for Cerium Doped SrHfO₃Films and Powders