Effects of particle size distribution and starting phase composition in Na-feldspar/kaolinite system at high temperature

Diella, Valeria; Adamo, Ilaria; Pagliari, Lucia; Pavese, Alessandro; Francescon, Fernando

doi:10.1016/j.jeurceramsoc.2014.10.035

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…Most likely SiO 2 needed for the formation of dicalcium silicate derived from small invisible quartz particles that are more reactive than the larger ones due to their larger surface area. Such a grains size effect was also reported for feldspar by Diella and co-workers, who studying the effect of particle size distribution in Na-feldspar/kaolinite system [75] and is consistent with Oswald ripening that is described by the Ostwald-Freundlich equation [76] in which surface tension causes small particles to dissolve and larger ones to grow. With increasing time (Section 3.2) or temperature (Section 3.3) dicalcium silicate rims have grown around larger quartz grains (Figures 13 and 16).…”

Section: In Situ Observations Of the Migration Of Solid-solid Reactiosupporting

confidence: 83%

In Situ Hyperspectral Raman Imaging: A New Method to Investigate Sintering Processes of Ceramic Material at High-temperature

et al. 2019

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In the last decades, Raman spectroscopy has become an important tool to identify and investigate minerals, gases, glasses, and organic material at room temperature. In combination with high-temperature and high-pressure devices, however, the in situ investigation of mineral transformation reactions and their kinetics is nowadays also possible. Here, we present a novel approach to in situ studies for the sintering process of silicate ceramics by hyperspectral Raman imaging. This imaging technique allows studying high-temperature solid-solid and/or solid-melt reactions spatially and temporally resolved, and opens up new avenues to study and visualize high-temperature sintering processes in multi-component systems. After describing in detail the methodology, the results of three application examples are presented and discussed. These experiments demonstrate the power of hyperspectral Raman imaging for in situ studies of the mechanism(s) of solid-solid or solid-melt reactions at high-temperature with a micrometer-scale resolution as well as to gain kinetic information from the temperature- and time-dependent growth and breakdown of minerals during isothermal or isochronal sintering.

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Section: In Situ Observations Of the Migration Of Solid-solid Reactiosupporting

confidence: 83%

In Situ Hyperspectral Raman Imaging: A New Method to Investigate Sintering Processes of Ceramic Material at High-temperature

et al. 2019

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“…Endmember proportions can also be described from the occupancy of the cavity cation sites alone (Equations (10) and 12- (14)), which give the same values as Equations (3)- (6). Equation (11) provides another estimate of the total excess silica proportion (Q cav2 ) based on the total cations.…”

Section: Ne-qz Solid Solution Seriesmentioning

confidence: 99%

“…The most probable alteration mineral would be cancrinite, which has a hexagonal structure with six-rings of tetrahedra similar to those of nepheline, although the linkages of these units are different in the two mineral groups. The general formula for the cancrinite group is (Na,K) 6 O. This is chemically similar to nepheline but is structurally different with the extra Na, Ca and large anions occupying "cancrinite cages" and large continuous channels (Deer et al 2004, their Figure 245) [51]; also see [52]).…”

Section: Ne-qz Solid Solution Seriesmentioning

confidence: 99%

“…Indeed, physical and chemical properties have led to very widespread industrial and environmental applications for feldspars and feldspathoid minerals and bulk rocks to semiconductors, glass making/ceramics, building and construction, and functional fillers in paints and composites [1]. Specific examples include nepheline and leucite in glass ceramics [2][3][4]; feldspar and nepheline in pottery, porcelain, and sanitary ware [5][6][7]; ionic and thermal conductivity [8][9][10]; catalysis and molecular sieving [11][12][13]; radioactive waste disposal [14][15][16]; dental ceramics [17][18][19]; and geophysical surveying [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Composition, Thermal Expansion and Phase Transitions in Framework Silicates: Revisitation and Review of Natural and Synthetic Analogues of Nepheline-, Feldspar- and Leucite-Mineral Groups

Henderson

2021

Solids

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Framework silicates form about 70% of the Earth’s crust, mainly feldspars ~50–60% and quartz ~10–15%. Less-abundant feldspathoids include nepheline-, leucite-, and sodalite-group minerals, rich in structurally challenging properties. This review paper deals with anhydrous feldspar-, nepheline-, and leucite/pollucite groups, emphasising the importance of parallel studies on natural and synthetic samples. Four topics are covered. For decades, petrologists have analysed nephelines and recalculated their compositions as endmember molecules but, by not following rules of stuffed-tridymite crystal chemistry, have not estimated reliably the excess SiO2 present in solid solution. Some materials scientists make similar mistakes, and a new approach is described here. Synthesis studies of analogue feldspars, nephelines, and leucite/pollucites led to collaborative studies, mainly using laboratory and synchrotron X-ray powder diffraction methods at room and elevated temperatures, to study thermal expansion and displacive phase transitions. Such work was recently expanded to address the spontaneous strain relations. Topics covered here include work on nepheline/kalsilite analogues in the system SrAl2O4—BaAl2O4; thermal expansion of (K,Na)Al-, RbAl-, RbGa-, and SrAl-feldspars; and thermal expansion and phase transitions in analogue leucites KGaSi2O6 (tetragonal to cubic) and K2MgSi5O12 (monoclinic to orthorhombic). Results are reviewed in the context of research published in mineralogical and more-widely in physical sciences journals.

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“…demir oksitler, kaolin, mika, vermükülit, quartz ve az miktarda feldispatlardan oluşmaktadır [4]. Quartz sinterlenen cisimlerin deformasyon ve büzülmesini dengelerken, sodyumca zengin feldispatlar sinterlenen cismin sağlamlaşmasını sağlayan ve porozitesini belirleyen yarı sıvı fazı oluştururlar [5][6][7].…”

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Light Weight Aggregate Production of Kütahya Region Red Soils by Rapid Sintering Method

Toprak

MERCAN

2021

Bilecik Şeyh Edebali Üniversitesi Fen Bilimleri Dergisi

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Bu çalışmada Çöğürler/Kütahya'dan alınan kırmızı toprak; i) gözenek oluşturmak amacıyla evsel atık arıtma çamuru, ii) sinterleme özelliklerini iyileştirmek için sodyum karbonat ve uçucu kül eklenerek hızlı sinterleme yöntemi ile hafif agrega üretilmiştir. Küçük silindirler şeklinde üretilen hafif agregaların fiziksel ve mekanik özeliklerine; kırmızı toprağın ağırlıkça %'si olarak uçucu kül miktarı (%12 ve %17), presleme kuvveti (1, 3 ve 5 kN) ve sinterleme sıcaklığının (1050 ve 1100°C) etkisi araştırılmıştır. Uçucu kül miktarı arttıkça basınç dayanımda artış gözlenmiştir. En yüksek hafif agrega özgül dayanımı (14,80 MPa / 0,98 ton/m 3 = 15,10 kN.m/kg) dikkate alınarak en uygun üretim %17 oranında uçucu kül kullanımı, 1 kN ile presleme ve 1050°C'de hızlı sinterleme ile elde edilmiştir.

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Effects of particle size distribution and starting phase composition in Na-feldspar/kaolinite system at high temperature

Cited by 12 publications

References 20 publications

In Situ Hyperspectral Raman Imaging: A New Method to Investigate Sintering Processes of Ceramic Material at High-temperature

In Situ Hyperspectral Raman Imaging: A New Method to Investigate Sintering Processes of Ceramic Material at High-temperature

Composition, Thermal Expansion and Phase Transitions in Framework Silicates: Revisitation and Review of Natural and Synthetic Analogues of Nepheline-, Feldspar- and Leucite-Mineral Groups

Light Weight Aggregate Production of Kütahya Region Red Soils by Rapid Sintering Method

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