Crystallization Behavior of Calcium Phosphate Glass

Tosic, B Mihajlo; Blagojević, Stevan; Nikolić, Nina; Zivanovic, D Vladimir

doi:10.4028/www.scientific.net/kem.206-213.1575

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Avrami exponent (n) had indicated the nucleation and growth mechanism. According to the Johnson-Mehl-Avrami (JMA) theory, (n) was also related to crystallization pattern, n= 2 means that the surface crystallization dominants the overall crystallization, n= 3 means two-dimensional crystallization, n= 4 means that three-dimensional crystallization for bulk materials [37][38][39].…”

Section: Crystallization Kinetics By Dscmentioning

confidence: 99%

Investigation DSC and XRD on the crystallization kinetics in the phosphate Li2O–Li2WO4–TiO2–P2O5 glassy ionic system

Es-soufi

Bih

Lima

et al. 2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

This work aims to investigate the prepared glasses within the 20Li2O−(50−x)Li2WO4−xTiO2−30P2O5 system, with 0≤x≤15 mol%. The bonds constituting the framework of these glasses were studied by Raman spectroscopy. The data analysis of the chemical durability showed that the dissolution rates depend on the composition of each glass. Thermal analysis by DSC technique was used to determine the activation energy of crystallization, it found in the glass of composition (x= 5) that Ec= 184.482 kJ/mol. The determinate Avrami parameter is around 1.7 which allows suggesting the mechanism is surface crystallization. The crystallization process of the prepared glasses is carried out by heating samples at 550°c for 4 hours and 12 hours. The crystallized phases are identi ed by XRD. The results of X−ray diffraction analysis con rm that TiO2 acts mainly as network forming units. The crystalline phases Li2WO4 (JCPDS# 01−072−0086) and (JCPDS# 01−087−0409) are formed during the crystallization process. The formation of these crystalline phases into the glasses depends on the time of heating at xed crystallization temperature. FTIR spectra of the glass-ceramics show nearly the same IR vibrational modes as their parent glasses.

show abstract

Section: Crystallization Kinetics By Dscmentioning

confidence: 99%

Investigation DSC and XRD on the crystallization kinetics in the phosphate Li2O–Li2WO4–TiO2–P2O5 glassy ionic system

Es-soufi

Bih

Lima

et al. 2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

Section: Crystallization Kinetics By Dscmentioning

confidence: 99%

Investigation DSC and XRD on the Crystallization Kinetics in the Phosphate Li2O−Li2WO4−TiO2−P2O5 Glassy Ionic System

Es-soufi

Bih

Lima³

et al. 2021

Preprint

View full text Add to dashboard Cite

This work aims to investigate the prepared glasses within the 20Li2O−(50−x)Li2WO4−xTiO2−30P2O5 system, with 0≤x≤15 mol%. The bonds constituting the framework of these glasses were studied by Raman spectroscopy. The data analysis of the chemical durability showed that the dissolution rates depend on the composition of each glass. Thermal analysis by DSC technique was used to determine the activation energy of crystallization, it found in the glass of composition (x= 5) that Ec= 184.482 kJ/mol. The determinate Avrami parameter is around 1.7 which allows suggesting the mechanism is surface crystallization. The crystallization process of the prepared glasses is carried out by heating samples at 550°c for 4 hours and 12 hours. The crystallized phases are identified by XRD. The results of X−ray diffraction analysis confirm that TiO2 acts mainly as network forming units. The crystalline phases Li2WO4 (JCPDS# 01−072−0086) and (JCPDS# 01−087−0409) are formed during the crystallization process. The formation of these crystalline phases into the glasses depends on the time of heating at fixed crystallization temperature. FTIR spectra of the glass–ceramics show nearly the same IR vibrational modes as their parent glasses.

show abstract

“…Dosadašnja istraživanja pokazala su da zbog svoje amorfne strukture stakla poseduju svojstva koja ih čine perspektivnim kandidatima za materijale sposobne da učestvuju u biološkim procesima živih organizama. Kako su istakli Tošić et al (2002) njihova hemijska aktivnost u procesima koji nastaju pri kontaktu sa raznim rastvorima veoma pomaže u dizajniranju i proizvodnji novih materijala koji su efikasni pri razvoju i rastu živih organizama i u zaštiti prirodne okoline. Njihova glavna prednost je fleksibilnost na promene hemijskog sastava, što omogućava uvođenje novih komponenti i menjanje njihovog sadržaja, a pri tome se kinetika i mehanizam procesa original scientific paper / originalni naučni članak www.nsseme.com/journal.html Zahvalnica: Ovaj rad je nastao u okviru istraživanja na projektu TR 34001 "Razvoj stakla sa kontrolisanim otpuštanjem jona za primene u poljoprivredi i medicine" finansiranom od strane Ministarstva prosvete i nauke Republike Srbije.…”

Section: Uvodunclassified

Application of controlled release glass in the production of French marigold (Tagetes patula L.)

Vujošević¹,

Lakic²,

Tošić³

et al. 2012

Ratar i povrt

View full text Add to dashboard Cite

Izvod: U radu je ispitivana mogućnost i opravdanost primene stakla sa kontrolisanim otpuštanjem hranljivih elemenata kao novog ekološkog materijala u proizvodnji biljaka-rasada kadifice (Tagetes patula L.). Tokom istraživanja praćen je njegov uticaj na razvijenost proizvedenih biljaka-rasada. Biljke-rasada proizvedene su u polistirenskim kontejnerima (speedling system) i polipropilenskim saksijama (pot system). Istraživanja su sprovedena u stakleniku Poljoprivrednog fakulteta u Beogradu tokom 2011. U toku proizvodnje rasada dodavano je ispitivano staklo granulacije < 0,5 mm u dozama 0-4 g/l. Rezultati istraživanja ukazuju na pozitivan efekat primenjenog stakla sa kontrolisanim otpuštanjem jona u proizvodnji biljaka-rasada kadifice. Njegovom primenom dobija se rasad bolje razvijenosti, te je njegova upotreba opravdana. Najbolji efekat na ispitivane parametre razvijenosti biljaka-rasada imala je doza od 1 g/l supstrata. Ključne reči: staklo sa kontrolisanim otpuštanjem hranljivih elemenata, kadifica, rasad Tagetes patula L. UvodU savremenoj proizvodnji rasada i cveća koriste se supstrati za čije se oplemenjivanje koriste različiti materijali ili komponente. Kako navodi Verhagen (1997) takvi materijali su obično nedovoljno ispitani i mogu dovesti do problema u proizvodnji biljaka, zbog čega je veoma važno ispitati nove materijale tj. komponente sa aspekta fizičkih, hemijskih, bioloških i ekoloških osobina, pre uvođenja u komercijalno korišćenje od strane proizvođača.Upotreba odgovarajućih eko-materijala u poljoprivredi, kako ističu Nikolić et al. (2011b) predstavlja ne samo savremeni trend već i imperativ u savremenoj poljoprivrednoj proizvodnji. Njima se ne postižu samo veći prinosi, već se utiče na očuvanje životne sredine.Rezultati brojnih nezavisnih istraživača (Bayer et al. 2007) ukazuju na značaj iznalaženja alternativnih supstrata, pa i samih komponenti koje ga čine, za proizvodnju rasada cveća u staklenicima. Oni ističu da se primenom alternativnih supstrata može uticati na smanjenje proizvodnih troškova, a time i cene gotovih proizvoda.Jedna od mogućih novih komponenti u supstratima mogu biti i različita stakla. Dosadašnja istraživanja pokazala su da zbog svoje amorfne strukture stakla poseduju svojstva koja ih čine perspektivnim kandidatima za materijale sposobne da učestvuju u biološkim procesima živih organizama. Kako su istakli Tošić et al. (2002) njihova hemijska aktivnost u procesima koji nastaju pri kontaktu sa raznim rastvorima veoma pomaže u dizajniranju i proizvodnji novih materijala koji su efikasni pri razvoju i rastu živih organizama i u zaštiti prirodne okoline. Njihova glavna prednost je fleksibilnost na promene hemijskog sastava, što omogućava uvođenje novih komponenti i menjanje njihovog sadržaja, a pri tome se kinetika i mehanizam procesa original scientific paper / originalni naučni članak www.nsseme.com/journal.html Zahvalnica: Ovaj rad je nastao u okviru istraživanja na projektu TR 34001 "Razvoj stakla sa kontrolisanim otpuštanjem jona za primene u poljoprivredi i medicine" finansiran...

show abstract

Crystallization Behavior of Calcium Phosphate Glass

Cited by 3 publications

References 0 publications

Investigation DSC and XRD on the crystallization kinetics in the phosphate Li2O–Li2WO4–TiO2–P2O5 glassy ionic system

Investigation DSC and XRD on the crystallization kinetics in the phosphate Li2O–Li2WO4–TiO2–P2O5 glassy ionic system

Investigation DSC and XRD on the Crystallization Kinetics in the Phosphate Li2O−Li2WO4−TiO2−P2O5 Glassy Ionic System

Application of controlled release glass in the production of French marigold (Tagetes patula L.)

Contact Info

Product

Resources

About