Local structure of hydroxy–peroxy apatite: A combined XRD, FT-IR, Raman, SEM, and solid-state NMR study

Yu, Huaguang; Zhang, Hailu; Wang, Xiaomin; Gu, Zhongwei; Li, Xudong; Deng, Feng

doi:10.1016/j.jpcs.2007.05.020

Cited by 37 publications

(30 citation statements)

References 42 publications

(65 reference statements)

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“…Figure 6(b) shows the librational (torsional) mode of lattice OH À which is characteristic of lattice hydroxyls and differentiates from the surface adsorbed hydroxyls. These observations agree well with the literature data ( Ref 20,21). Ca 9.78 Cs 0.2 (PO 4 ) 6 (OH) 1.96 sample heated at 973 K shows only the stretching modes of lattice hydroxyls (3571 cm À1 ).…”

Section: Solid Solution Formation and Phase Stabilitysupporting

confidence: 93%

Thermal Expansion and Phase Stability Investigations on Cs-Substituted Nanocrystalline Calcium Hydroxyapatites

Jena

Asuvathraman

Kutty

2010

J. of Materi Eng and Perform

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The high-temperature phase stability of Ca 102x Cs x (PO 4 ) 6 (OH) 2 , (x = 0-3) compositions synthesized by various wet chemical methods was investigated. The thermal expansion property of Ca 10 (PO 4 ) 6 (OH) 2 (abbreviated as CaHAp) and Cs-substituted CaHAp was measured by high-temperature XRD and dilatometry. The average crystallite size of the powders synthesized by wet chemical methods was found to be 10-50 nm range as shown by XRD and TEM. Up to 30 mol% Cs loading was observed to show only the apatite phase by XRD when the apatite powder was nanocrystalline in nature. However, high-temperature stability of the Cs-substituted system is limited to £5 mol%. Cs 3 (PO 4 ) is observed to be separated out on heating the material above 773 K for compositions substituted with more than 5 mol% of Cs in the Ca-sublattice. The coefficient of thermal expansion measured by HTXRD is a a = 12.42 3 10 26 K 21 , a c = 14.98 3 10 26 K 21 ; and a a = 12.62 3 10 26 K 21 , a c = 12.57 3 10 26 K 21 for CaHAp and Ca 9.78 Cs 0.2 (PO 4 ) 6 (OH) 1.96 , respectively, in the temperature range of 298-1083 K. Bulk thermal expansion measurements are seen to be in agreement with the lattice expansion results.

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Section: Solid Solution Formation and Phase Stabilitysupporting

confidence: 93%

Thermal Expansion and Phase Stability Investigations on Cs-Substituted Nanocrystalline Calcium Hydroxyapatites

Jena

Asuvathraman

Kutty

2010

J. of Materi Eng and Perform

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“…765 cm –1 . In the calcium peroxy‐hydroxyapatites, a very weak band corresponding to symmetrical stretching vibrations of O 2 2– was observed at 750–754 cm –1 8,12,13. Hence we attributed the band at 765–770 cm –1 to the peroxide ion in the channel of the strontium apatite.…”

Section: Resultsmentioning

confidence: 74%

“…Fully symmetrical stretching vibration ν 1 of PO 4 3– for the strontium hydroxyapatite sample is observed at 950 cm –1 , whereas for the sample with the highest peroxide content this band is slightly shifted toward 952 cm –1 . In calcium hydroxyapatite the same band is located at 961 cm –1 and moves to 964 cm –1 in peroxy‐hydroxyapatite 13. In a free PO 4 3– ion ν 1 is ca.…”

Section: Resultsmentioning

confidence: 81%

“…The superoxide ion was proposed to be located inside the Ca 6 octahedron and to be tilted from the c axis 10. Later on hydroxy‐peroxyapatite Ca 10 (PO 4 ) 6 (O 2 ) x (OH) 2–2 x was prepared by annealing powdered Ca 10 (PO 4 ) 6 (OH) 2 in air at 1250 °C in an alumina crucible 12,13. The authors mentioned that only the lower part of the sample contained peroxide while the upper part represented pure hydroxyapatite.…”

Section: Introductionmentioning

confidence: 99%

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An Unprecedented Process of Peroxide Ion Formation and its Localization in the Crystal Structure of Strontium Peroxy‐HydroxyapatiteSr₁₀(PO₄)₆(O₂)_x(OH)_2–2x.

Казин¹,

Zykin²,

Dinnebiér³

et al. 2012

Zeitschrift anorg allge chemie

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Formation of strontium peroxy-hydroxyapatite solid solution Sr 10 (PO 4 ) 6 (O 2 ) x (OH) 2-2x was studied on annealing the hydroxyapatite in the temperature range 900-1350°C in oxygen, air, and argon atmosphere. The redox process was found to display unprecedented features: (i) the peroxide content increased with raising temperature, (ii) the peroxide content remained substantial even at a low oxygen pressure of 1.013 Pa, (iii) the peroxide content was extremely persistent, and even at a temperature of 1350°C in oxygen atmosphere the peroxide groups substituted more than two-third of the original hydroxide groups. Chemical processes consistent with these features are suggested. In the UV/Vis spectrum, an absorption peak at 300 nm was recorded, which was attributed to an electronic transition in the peroxide ion, since its intensity depended linearly on the peroxide content.

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“…To conclude, one should mention that various types of calcium peroxy-HA (oxygenated HA) could be prepared both in the presence of hydrogen peroxide (Rey et al 1978) and by HA heating in an oxygen-rich atmosphere (Zhao et al 2000;Yu et al 2007). Similar to that for OA, none of them was ever prepared as a phase pure individual compound and no examples of the biomedical applications of such types of CaPO 4 were found.…”

Section: Oa (Or Oap or Oxa)mentioning

confidence: 99%

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Dorozhkin¹

2017

Morphologie

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Local structure of hydroxy–peroxy apatite: A combined XRD, FT-IR, Raman, SEM, and solid-state NMR study

Cited by 37 publications

References 42 publications

Thermal Expansion and Phase Stability Investigations on Cs-Substituted Nanocrystalline Calcium Hydroxyapatites

Thermal Expansion and Phase Stability Investigations on Cs-Substituted Nanocrystalline Calcium Hydroxyapatites

An Unprecedented Process of Peroxide Ion Formation and its Localization in the Crystal Structure of Strontium Peroxy‐HydroxyapatiteSr₁₀(PO₄)₆(O₂)_x(OH)_2–2x.

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

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Local structure of hydroxy–peroxy apatite: A combined XRD, FT-IR, Raman, SEM, and solid-state NMR study

Cited by 37 publications

References 42 publications

Thermal Expansion and Phase Stability Investigations on Cs-Substituted Nanocrystalline Calcium Hydroxyapatites

Thermal Expansion and Phase Stability Investigations on Cs-Substituted Nanocrystalline Calcium Hydroxyapatites

An Unprecedented Process of Peroxide Ion Formation and its Localization in the Crystal Structure of Strontium Peroxy‐HydroxyapatiteSr10(PO4)6(O2)x(OH)2–2x.

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

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Product

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An Unprecedented Process of Peroxide Ion Formation and its Localization in the Crystal Structure of Strontium Peroxy‐HydroxyapatiteSr₁₀(PO₄)₆(O₂)_x(OH)_2–2x.