Structure and thermal stability of fluorhydroxyapatite and fluorapatite obtained by mechanochemical method

Булина, Н. В.; Makarova, Svetlana V.; Prosanov, I. Yu.; Винокурова, О. Б.; Lyakhov, N. Z.

doi:10.1016/j.jssc.2019.121076

Cited by 20 publications

(11 citation statements)

References 25 publications

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“…Also, synthetic stoichiometric HAP should be well annealed at high temperatures in humid air. Table 2 provides experimental data that mostly meet these requirements [ 11 , 58 , 59 , 60 , 61 , 62 ]. Below in Section 3.3.1 , we discuss this data in comparison with our calculations.…”

Section: Main Results and Discussionmentioning

confidence: 99%

“…At the same time, calculations using PBE (GGA) show that the value of the lattice parameter also relatively increases by δ a ~0.6%, and the parameter c increases by δ c ~0.5% (see Table 2 ). For comparison with experimental data, we use here the results of experiments on heating and cooling HAP samples, which should lead to the escape of some OH groups from the OH HAP channel and the formation of OH vacancies in HAP ([ 58 , 59 , 60 ] in Table 2 ).…”

Section: Main Results and Discussionmentioning

confidence: 99%

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Simulation and Computer Study of Structures and Physical Properties of Hydroxyapatite with Various Defects

et al. 2021

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Simulation and computer studies of the structural and physical properties of hydroxyapatite (HAP) with different defects are presented in this review. HAP is a well-known material that is actively used in various fields of medicine, nanotechnology, and photocatalytic processes. However, all HAP samples have various defects and are still insufficiently studied. First of all, oxygen and OH group vacancies are important defects in HAP, which significantly affect its properties. The properties of HAP are also influenced by various substitutions of atoms in the HAP crystal lattice. The results of calculations by modern density functional theory methods of HAP structures with these different defects, primarily with oxygen and hydroxyl vacancies are analyzed in this review. The results obtained show that during the structural optimization of HAP with various defects, both the parameters of the crystallographic cells of the HAP change and the entire band structure of the HAP changes (changes in the band gap). This affects the electronic, optical, and elastic properties of HAP. The review considers the results of modeling and calculation of HAP containing various defects, the applied calculation methods, and the features of the effect of these defects on the properties of HAP, which is important for many practical applications.

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Section: Main Results and Discussionmentioning

confidence: 99%

Section: Main Results and Discussionmentioning

confidence: 99%

Simulation and Computer Study of Structures and Physical Properties of Hydroxyapatite with Various Defects

et al. 2021

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“…Fluor bisa mensubstitusi gugus hiroksil (OH -) di dalam hidroksiapatit membentuk kristal dengan rumus Ca10(PO4)6(OH)2-xF2x, dengan nilai x menunjukkan jumlah indeks gugus hidroksil (OH -) yang diganti dengan ion fluor (F -) [7], [8]. Kehadiran fluor terbukti meningkatkan kestabilan termal, driving force pertumbuhan kristal pada proses kalsinasis dan konduktivitas serta peningkatan kompatibilitas dari hidroksiapatit [8]- [11].…”

Section: Pendahuluanunclassified

“…Beberapa cara yang bisa digunakan untuk menghasilkan fluorhidroksiapatit adalah reaksi solid state, presipitasi, hidrotermal dan sol gel yang mana hasil dari fluorhidroksiapatit dalam bentuk bubuk atau keramik [7], [8], [11]. Hidroksiapatit yang diperoleh dengan metode hidrotermal akan menghasilkan kristal yang homogen, dan memiliki kemurnian bahan yang lebih terjaga dibandingkan dengan metode lain karena sampel dimasukkan ke dalam teflon dan bejana baja yang tertutup rapat sehingga terjaga dari kontaminasi luar [16], [17].…”

Section: Pendahuluanunclassified

“…Berdasarkan hasil FTIR nampak penyerapan spektrum untuk konsentrasi fluor x = 0.4, 0.6, 0.8, dan 2 pada bilangan gelombang 740 cm -1 , yang merupakan mode librasi gugus OHyang terhubung dengan ion fluor melalui ikatan hidrogen [7], [20]. Selain serapan spektrum dari gugus fosfat dan OH -, yang nampak pada spektrum hasil FTIR semua sampel, terdapat spektrum serapan dari ion karbonat pada rentang 1400 -1500 cm -1 [7].…”

Section: Metodeunclassified

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Karakterisasi Sifat Listrik Dan Sifat Termal Hidroksiapatit, Fluorhidroksiapatit Dan Fluorapatit

Riano

Sukaryo²,

Sugeng³

et al. 2022

SST

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The apatite compound that is often used in medicine and dentistry is hydroxyapatite with the chemical formula Ca10(PO4)6(OH)2. Fluor ions can substitute hydroxyl ions from hydroxyapatite to form crystals with the formula Ca (PO4)6(OH)2-xF2x, with the value of x indicating the index number of hydroxyl groups (OH-) replaced by fluor ions (F-). This study aims to determine the effect of fluor ion substitution on hydroxyapatite on electrical properties and thermal stability. In this study, the hydrothermal method was characterized by X-Ray diffractometer (XRD), Fourier Transform Infra-Red Spectroscopy (FTIR), LCR meter, Thermogravimetry Analysis (DTA), and Differential Thermal Analysis (TGA). The XRD and FTIR analysis results showed that the samples obtained were in the form of hydroxyapatite, fluorhydroxyapatite, and fluorapatite, which was also indicated by the presence of functional groups PO43-, CO32-, and OH- group libration mode at a wavenumber of 740 cm-1. There was a decrease in the lattice parameter a and an increase in the crystal size as the substitution of fluor ions increased. Based on the results of the electrical and thermal properties characterization, fluorapatite has the highest conductivity and better thermal stability when compared to hydroxyapatite and fluohydroxyapatite.Keywords – Fluor, Hydroxyapatite, Hydrothermal, eggshell, Biomaterial

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Non-isothermal Kinetic Analysis of Synthesis of Medical Applicable Fluorapatite in Solid-state Reaction

Mosavian,

Ebrahimi-Kahrizsangi,

Hamidi

et al. 2024

Biomedical Materials & Devices

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Structure and thermal stability of fluorhydroxyapatite and fluorapatite obtained by mechanochemical method

Cited by 20 publications

References 25 publications

Simulation and Computer Study of Structures and Physical Properties of Hydroxyapatite with Various Defects

Simulation and Computer Study of Structures and Physical Properties of Hydroxyapatite with Various Defects

Karakterisasi Sifat Listrik Dan Sifat Termal Hidroksiapatit, Fluorhidroksiapatit Dan Fluorapatit

Non-isothermal Kinetic Analysis of Synthesis of Medical Applicable Fluorapatite in Solid-state Reaction

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