Identification of tetragonal and cubic structures of zirconia using synchrotron x-radiation source

Srinivasan, Ram; Angelis, R.J. De; Ice, Gene E.; Davis, Burtron H.

doi:10.1557/jmr.1991.1287

Cited by 150 publications

(67 citation statements)

References 16 publications

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“…37-1484 [13][14][15][16]. Generally, the aim of pillarization is to insert metal oxide as pillars within the interlayer regions of the smectite structure, and it will enhance the specific surface area by increasing d 001 reflection.…”

Section: Resultsmentioning

confidence: 99%

Effect of Calcination Temperature on the Synthesis of ZrO<sub>2</sub>-Pillared Saponite to Catalytic Activity in Menthol Esterification

2018

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Section: Resultsmentioning

confidence: 99%

Effect of Calcination Temperature on the Synthesis of ZrO<sub>2</sub>-Pillared Saponite to Catalytic Activity in Menthol Esterification

2018

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“…Many research works has been carried out under the stabilization of zirconia material [17][18][19]. It is a polymorphic material which exists in three well known forms such as monoclinic cubic and tetragonal [20]. Because of its low toxicity, zirconia (ZrO 2 ) can be considered a potential host matrix for the design and fabrication of innovative nanomaterial [21].…”

Section: Introductionmentioning

confidence: 99%

Interfacial effect: magnetism in pure ZrO2, ZnO and SiO2 coated core/shell/shell hybrid nanoparticles

Selvi

Lee

Dinakaran

2014

J Mater Sci: Mater Electron

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We report the room temperature magnetic behavior of pure and dual shells ZnO as well as SiO 2 coated ZrO 2 core-shell nanoparticles. All the samples, viz., ZrO 2 , ZrO 2 /ZnO and ZrO 2 /ZnO/SiO 2 nanocrystallites have been successfully synthesized by chemical precipitation method. The XRD studies confirm the tetragonal structure for pure Zirconia and hexagonal wurtzite structure for ZnO coated ZrO 2 samples. Average size of nanocrystallites has been observed to increase due to the incorporation of the shells over ZrO 2 . Studies of SEM, TEM and EDAX were used to determine the morphology, size and presence of elements in the ZrO 2 nanocrystallites. The existence of SiO 2 on ZrO 2 @ZnO was characterized by FT-IR measurement. The VSM studies have shown that the dual shells ZnO as well as SiO 2 coated ZrO 2 samples exhibit S-shaped paramagnetic behavior of the samples with little variations. The paramagnetic ordering of this core-shell nanostructure was mainly attributed to oxygen vacancies and also to the minor impurity phases in Zirconia and ZnO lattices.

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“…YSZ can be synthesized by co-precipitation, sol-gel, solid state and hydrothermal routes. YSZ has been prepared using different precursors mainly oxalate, hydroxide and citrate [7][8][9][10]. There are very few reports on partial substitution of strontium +2 ions in YSZ [11].…”

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Gas Sensing Potential of Strontia Doped Yttria Stabilized Zirconia

Purandare¹,

Khaladkar²

2017

IJET

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Abstract-Different samples of strontia doped yttria stabilized zirconia were synthesized by decomposition of mechanical mixture of oxalate precursors. Strontia was doped in 5 and 8 mol percent keeping yttria constant at 5 mole percent and remaining zirconia in the stoichiometry. Thermal decomposition was studied using TG and DTA from ambient to 1300˚C. In another experiment, oxalate mixtures under study were heated from ambient temperature to 1300˚C at the rate of 10˚C/min. The detailed study on phase formation temperature were carried out by heating samples from 1000 to 1300˚C and cooling the products to room temperature and recording X-ray Diffraction pattern for the in process sample. Surface morphology was studied by scanning electron microscopy. The product formed was pressed into round discs and checked for its potential for sensing various gases like NO, H 2 S and acetone and responses were monitored at room temperature. The concentrations of the test gases used were in the range of 5-25 ppm.Keyword-YSZ; strontia doped; phase formation; gas sensing I. INTRODUCTION Yttria stabilized zirconia( YSZ) is a widely studied ceramic compound. A lot of research work has been reported on stabilization of zirconia in partially stabilized and completely stabilized tetragonal and cubic structure. Zirconia exhibits three polymorphic forms viz. monoclinic, tetragonal and cubic. The monoclinic form of zirconia is stable at room temperature and changes to a denser tetragonal form at 1000°C [1]. There are disadvantages of using zirconia in monoclinic structure since it involves a volume change of about 4-5% during its conversion to tetragonal form resulting in to cracks in the structure [2]. Hence stabilization of zirconia is necessary in cubic or tetragonal form. Different cations have been used for stabilization of zirconia. This stabilization of zirconia makes it possible to be used in a wide range of applications. Amongst a variety of cations tried yttria in 8 to 15 mole percent, appears to be most advantageous and is a commercially available product for a wide range of applications [3].Yttria stabilized zirconia also find varied applications in fields like thermal barrier coatings [4], dental ceramics [5], solid oxide fuel cells and gas sensors [6]. YSZ can be synthesized by co-precipitation, sol-gel, solid state and hydrothermal routes. YSZ has been prepared using different precursors mainly oxalate, hydroxide and citrate [7][8][9][10]. There are very few reports on partial substitution of strontium +2 ions in YSZ [11].In present paper, synthesis of strontia doped yttria stabilized zirconia was carried out by mechanical mixing of oxalate salts. Characterisation of the resultant products was done by thermo-gravimetric analysis (TGA), differential thermal analysis (DTA), X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The present paper reports the gas sensing potential of the final products with nominal composition (Zr 0.90 . Thermal profiling of the end products from 1000 to 1300°C was carried out to...

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Identification of tetragonal and cubic structures of zirconia using synchrotron x-radiation source

Cited by 150 publications

References 16 publications

Effect of Calcination Temperature on the Synthesis of ZrO<sub>2</sub>-Pillared Saponite to Catalytic Activity in Menthol Esterification

Effect of Calcination Temperature on the Synthesis of ZrO<sub>2</sub>-Pillared Saponite to Catalytic Activity in Menthol Esterification

Interfacial effect: magnetism in pure ZrO2, ZnO and SiO2 coated core/shell/shell hybrid nanoparticles

Gas Sensing Potential of Strontia Doped Yttria Stabilized Zirconia

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