NaPO3 Glass surface crystallization studies by the light transmittance thermal analysis

Mojumdar, S. C.; Drábik, M.; Chocholoušek, J.; Kovář, Vladimír; Majling, J.

doi:10.1007/s10973-005-7046-4

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…A variety of glass ceramics containing fluorapatite with appropriate mechanical, optical, thermal and chemical properties have been developed during the last years for biomedical and dental applications. [7][8][9] Glass ceramic materials possessing tailor made properties are obtained through controlled crystallisation by heat treatment of related glass. Both volume and surface nucleation can be exploited for that purpose.…”

Section: Introductionmentioning

confidence: 99%

Bioactivity investigation of glass and glass ceramics in Li₂O–SiO₂–CaO–P₂O₅–CaF₂system

Kuzielová¹,

Palou²,

Lokaj³

et al. 2008

Advances in Applied Ceramics

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Glass samples in Li 2 O-SiO 2 -CaO-P 2 O 5 -CaF 2 system with different contents of P 2 O 5 , CaO and CaF 2 in relative ratios responded to fluoroapatite (FA) composition (referred to P 2 O 5 addition) have been prepared and heat treated at 550 and 750uC to obtain glass ceramics. Bioactivity of all samples has been proved in vitro by the presence of new layer of apatite-like phases formed after soaking in simulated body fluid (SBF). The development and the apatitic character of created layers have been demonstrated by Fourier transform infrared analysis. Scanning electron microscopy and electron probe microanalysis have demonstrated that the density and the thickness of new layer depend on P 2 O 5 content, crystallisation temperature and immersion time. The bioactivity has been enhanced by P 2 O 5 addition as well in the case of the base glasses as in the case of glass ceramics. The additional heat treatment appeared to inhibit the bioactive behaviour, though the longer SBF acting leads to the additional formation of apatite-like layer. The mechanical properties, expressed as Vicker hardness, have been found higher and increasing with P 2 O 5 in glass ceramics treated at 750uC comparatively with base glass samples and the highest value of 7?37 GPa has been achieved by 14 wt-%P 2 O 5 addition. The same content of P 2 O 5 in glass ceramics heat treated at 550uC resulted in a decrease in hardness to a minimum value from all samples. The increase and decrease in hardness responded to development and suppression of crystallisation respectively. The inhibition of crystallisation has been affected by the presence of 'amorphous' FA according to X-ray diffraction and differential thermal analysis results.

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Section: Introductionmentioning

confidence: 99%

Bioactivity investigation of glass and glass ceramics in Li₂O–SiO₂–CaO–P₂O₅–CaF₂system

Kuzielová¹,

Palou²,

Lokaj³

et al. 2008

Advances in Applied Ceramics

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“…The mono-alkali polyphosphate salts of this system are NaPO 3 and LiPO 3 , which have the melting point at 628 and 657 °C, respectively [22,30,31]. As expected, mixing these single salts allowed decreasing the melting point (Fig.…”

Section: Characterization Of the Binary Li-na-pomentioning

confidence: 57%

Binary and ternary alkali polyphosphates (MPO3, M = Li, Na, K) for thermal energy storage

Minh

Sane

et al. 2020

J Therm Anal Calorim

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Up-to-date, solar salt (a mixture of 60 mass% NaNO 3 and 40 mass% KNO 3 ) is practically the only media for thermal energy storage (TES) in concentrated solar power (CSP). This commercial product's utilization is limited below 550 °C to avoid an irreversible thermal decomposition. The development of new performing TES materials is decisive for the deployment of CSP technology. Our recent work reported promising results obtained with mono-alkali polyphosphate (M-PO 3 ) as TES materials. These materials can work up to around 900 °C, but their melting point is still high, which is at least 628 °C. In order to lower their melting point, binary and ternary mixtures of alkali polyphosphates are investigated in this work. Different mixtures made of two or three alkali polyphosphates were prepared and studied using thermal analysis methods. The most promising mixture found in this work was the ternary Li-Na-K-PO 3 , which contained 33.3% (mol%) of each alkali metal. This mixture can be used as a liquid TES material in the temperature range of 398 to 900 °C. The results open new prospects for the development of the thermal energy storage field.

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Crystallization and thermal characterization of calcium hydrogen phosphate dihydrate crystals

Madhurambal

Subha²,

Mojumdar

2009

J Therm Anal Calorim

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NaPO3 Glass surface crystallization studies by the light transmittance thermal analysis

Cited by 7 publications

References 10 publications

Bioactivity investigation of glass and glass ceramics in Li₂O–SiO₂–CaO–P₂O₅–CaF₂system

Bioactivity investigation of glass and glass ceramics in Li₂O–SiO₂–CaO–P₂O₅–CaF₂system

Binary and ternary alkali polyphosphates (MPO3, M = Li, Na, K) for thermal energy storage

Crystallization and thermal characterization of calcium hydrogen phosphate dihydrate crystals

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NaPO3 Glass surface crystallization studies by the light transmittance thermal analysis

Cited by 7 publications

References 10 publications

Bioactivity investigation of glass and glass ceramics in Li2O–SiO2–CaO–P2O5–CaF2system

Bioactivity investigation of glass and glass ceramics in Li2O–SiO2–CaO–P2O5–CaF2system

Binary and ternary alkali polyphosphates (MPO3, M = Li, Na, K) for thermal energy storage

Crystallization and thermal characterization of calcium hydrogen phosphate dihydrate crystals

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Product

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Bioactivity investigation of glass and glass ceramics in Li₂O–SiO₂–CaO–P₂O₅–CaF₂system

Bioactivity investigation of glass and glass ceramics in Li₂O–SiO₂–CaO–P₂O₅–CaF₂system