Synthesis and characterization of an amorphous precursor for leucite dental ceramics

Kohoutková, Martina; Kloužková, Alexandra; Костка, П.; Mrázová, Martina

doi:10.1016/j.jnoncrysol.2007.07.075

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…This technology ensures reproducible control of leucite ceramics' microstructure, which is required to improve its fracture toughness and persistence. The fundamental step for an extensive use of this technology consists in the reproducible synthesis of leucite [9].…”

Section: Results and Discussion X-ray Diffraction Results Are Shown mentioning

confidence: 99%

Characterization of the Specificity in Three Commercial Dental Ceramic Powders

Manolea¹,

Opri²,

Cioateră³

et al. 2017

Rev. Chim.

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The aim of this study was to present and discuss the characteristics of three ceramic powders as well as the sintered material from the three commercial dental ceramics produced by Vita Zahnfabrik, Germany (VM13 and VMK Master, used for veneering metal frameworks, respectivelly VM9 used for veneering zirconia frameworks). An X-ray diffraction (XRD) analysis was performed, Raman spectra were recorded and the morphology of the samples was evidenced by using a high resolution scanning electron microscope, equipped with an EDXS detector. The results of this study corroborated with the presented literature data helps practitioners to better understand the interaction of these biomaterials with oral tissues, and, also helps researchers to modify the properties of ceramics for a better integration in the intraoral condition.

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Section: Results and Discussion X-ray Diffraction Results Are Shown mentioning

confidence: 99%

Characterization of the Specificity in Three Commercial Dental Ceramic Powders

Manolea¹,

Opri²,

Cioateră³

et al. 2017

Rev. Chim.

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“…Hydrothermal synthesis of amorphous precursors is described below [16]. Starting sols were made by mixing aluminate and silicate solutions, which had been prepared separately by dissolving amorphous SiO 2 (Lach Ner s.r.o., Czech Republic) and aluminum powder (Lachema, Czech Republic) in a potassium hydroxide (Penta Chrudim, Czech Republic) solution while being stirred constantly.…”

Section: Synthesismentioning

confidence: 99%

Kinetic studies on leucite precursors

2009

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Kinetic studies were performed on two types of leucite precursors. These precursors were prepared using a hydrothermal method at 150°C; the reaction time was 1.5 hours. In order to obtain precursors having different amounts of seed the molarity of KOH was changed. These intermediate products were subsequently calcinated from 5 minutes to 72 hours at temperatures of 850°C, 900°C, 950°C, 1000°C and 1050°C. The crystallinities of the powders were calculated by X-ray diffraction analysis. The crystallization curves for the synthesis of leucite exhibited a typical sigmoidal characteristic. Using different kinetic equations it was found that the Avrami-Eroféev model is the most appropriate to describe the experimental data. Using the Avrami-Eroféev model n reaches an average value of 2.9 which is connected with the three-dimensional growth of nuclei. The calculated activation energy of crystallization of leucite was 385 kJ mol -1 for non-seeded precursors and 246 kJ mol -1 for seeded precursors, respectively.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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“…Synthesis of leucite has been achieved in the past by various methods, including the solid state method 7–11 , the sol-gel method 12–14 , the molten salt technique; 8,15 the coprecipitation method 16 , the hydrothermal cation exchange from analcime 17,18 and the technique from a hydrothermally-derived precursor 3,17,19,20 .…”

Section: Introductionmentioning

confidence: 99%

“…Kohoutkova et al . 19 developed a preparation procedure of leucite from amorphous precursors; leucite precursors were prepared by a hydrothermal route at the temperatures of 100°, 150°, and 200 °C (from 1 to 72 h) and their successive calcination was performed at 1000 °C. Regarding starting materials used in conjunction with the hydrothermal method, various silica sources have also been tested.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Leucite Using a Diatomite Precursor

Novembre

Gimeno

Poe

2019

Sci Rep

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Leucite is nowadays an important component in ceramic restoration systems with particular suitability to dental porcelains. The leucite synthesis from a hydrothermally-derived precursor is here presented. A silicate solution was prepared by mixing a naturally derived amorphous silica (diatomitic rock from Crotone, southern Italy) with potassium hydroxide and an aluminate solution was obtained by mixing aluminium hydroxide and potassium hydroxide. Three mixtures of varying ratios of aluminate and silicate solutions were prepared and submitted to hydrothermal treatment at 150 °C for one hour. Subsequently these hydrothermal precursors were subjected to calcination at the temperature of 1000 °C for variable time intervals, thus resulting in 3 series of syntheses. The synthesis run 3 turned out to be the best from the point of view of temporal yield showing the crystallization of the leucite after only 15 hours of heat treatment. The products of synthesis run 3 were fully characterised by Powder X-Ray Diffraction, Inductively Coupled Plasma Optical Emission Spectrometry, Infrared Spectroscopy and Thermal Analysis. The amorphous phase in the synthesis powders was estimated by quantitative phase analysis using the combined Rietveld and reference intensity ratio methods. Density of leucite was also achieved by He-pycnometry. The use of a cost effective starting material such as a diatomite in the experimental route makes the process highly attractive for expansion to an industrial scale especially considering that both the chemical and physical characterizations of our leucite product are highly satisfactory. Last but not least we explain some inferences that can be obtained from this process of synthesis in order to a better understanding of some natural occurrences of leucite in geologic systems related to basaltic magmas.

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Synthesis and characterization of an amorphous precursor for leucite dental ceramics

Cited by 9 publications

References 5 publications

Characterization of the Specificity in Three Commercial Dental Ceramic Powders

Characterization of the Specificity in Three Commercial Dental Ceramic Powders

Kinetic studies on leucite precursors

Synthesis and Characterization of Leucite Using a Diatomite Precursor

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