Infra-red investigation of dicalcium phosphates

Petrov, I.; Šoptrajanov, Bojan; Fuson, Nelson; Lawson, James R.

doi:10.1016/0584-8539(67)80155-7

Cited by 99 publications

(63 citation statements)

References 11 publications

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“…According to these hypotheses, we have calculated different parameters, characteristic of the motions: -The slopes of the curves of the logarithm of the total intensity as function of Q give the mean square amplitudes of vibration 1u2 (Eq. [5]). -The HWHM values are quasi-constant: the broadening tends to the asymptotic value "1/ , independent of the momentum transfer.…”

Section: Iii23 Modeling Of the Qe Signalsmentioning

confidence: 93%

Study of Protonic Mobility in CaHPO4·2H2O (Brushite) and CaHPO4(Monetite) by Infrared Spectroscopy and Neutron Scattering

Tortet

Gavarri

Nihoul

et al. 1997

Journal of Solid State Chemistry

122

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Section: Iii23 Modeling Of the Qe Signalsmentioning

confidence: 93%

Study of Protonic Mobility in CaHPO4·2H2O (Brushite) and CaHPO4(Monetite) by Infrared Spectroscopy and Neutron Scattering

Tortet

Gavarri

Nihoul

et al. 1997

Journal of Solid State Chemistry

122

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“…The relationship between IR absorbance and the concentration of the component obeys Lambert-Beer's law. Petrov and Šoptrajanov successfully applied FT-IR spectroscopy to the characterization of metastable calcium phosphates [8]. Changa et al [9] employed FT-IR spectroscopy to analyze the crosslinking of the HAp/Collagen nano-composite.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon dioxide on self-setting apatite cement formation from tetracalcium phosphate and dicalcium phosphate dihydrate; ATR-IR and chemoinformatics analysis

et al. 2015

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Rapid self-setting apatite cement (SSAC) formation from tetracalcium phosphate (TeCP) and dicalcium phosphate dihydrate (DCPD) has been investigated by an attenuated total reflection Fourier transform infrared (ATR-IR) spectroscopy coupled with a principal component analysis (PCA). After TeCP and DCPD were kneaded with phosphoric acid, the peaks of ATR-IR spectra for the kneaded sample shift significantly in the ranges of 2250-2400 and 850-1150 cm −1 due to the crystalline transformation into hydroxyapatite (HAp). The PCA results indicate that the loadings of principal components 1 and 2 (PC1 and PC2, respectively) are ascribed to CO 2 and phosphate group, respectively, in the transforming cement. The PC1 score initially increases to reach a maximum at around 1000 s and then decreases. In contrast, the PC2 score increases continuously, but its increment became lesser with time. Although the profiles of PC2 score against PC1 score are similar in shape, there are deviations among the profiles obtained through quadruplicate experiments. The scores are, therefore, time differentiated, and the relationship between the differentiated scores is analyzed. The time differentiation approach is found to be useful for understanding complicated chemical reactions. The PCA results suggest that SSAC formation can be divided into three major stages. In the first stage, CO 2 concentration in the transforming cement rapidly increases, which triggers HAp crystallization. In the second stage, CO 2 concentration still increases, but its increasing rate drastically decreases; HAp crystallization continues with increasing rate. In the last stage, CO 2 concentration decreases, and HAp crystallization significantly slows down.

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“…CaHPO 4 (monetite) has been the subject of several crystallographic (MacLennan & Beevers, 1955;Jones & Cruickshank, 1961;Curry, Denne & Jones, 1968;Denne & Jones, 1971;Dickens, Bowen & Brown, 1972), spectroscopic (Blinc & Had~.i, 1960;Petrov, Soptrajanov, Fuson & Lawson, 1967) and other physicochemical studies (Egan & Wakefield, 1964).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen bonding in the crystalline state. CaHPO4 (monetite), P1 or P1? A novel neutron diffraction study

Catti¹,

Ferraris²,

Filhol³

1977

Acta Crystallogr B Struct Crystallogr Cryst Chem

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1749 independent reflexions, measured on a single-crystal neutron diffractometer (/1. = 1.217 /k), were used for refining the crystal structure of CaHPO 4 in both space groups P| (R = 0.0283) and PI (R = 0-0286). In the P1 model a proton lies on a symmetry centre forming a symmetric hydrogen bond (2.459 ,/~) and another is statistically distributed between two centrosymmetric positions; in the P1 models the first proton is slightly off the centre and the second is either ordered or disordered. By crystal-chemical considerations on the refinements, and taking into account a heat capacity anomaly at about 280 K together with very weak effects of piezoelectricity and of generation of the second optical harmonic at room temperature, the existence of a low-temperature ordered (P1) phase and a high-temperature disordered (P1) phase is suggested; diffraction data would come from a crystal in the disordered phase with a small fraction of the ordered one. A peculiar version of the KKM effect is shown by the difference maps. X-ray and neutron diffraction refinements are compared statistically.

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Infra-red investigation of dicalcium phosphates

Cited by 99 publications

References 11 publications

Study of Protonic Mobility in CaHPO4·2H2O (Brushite) and CaHPO4(Monetite) by Infrared Spectroscopy and Neutron Scattering

Study of Protonic Mobility in CaHPO4·2H2O (Brushite) and CaHPO4(Monetite) by Infrared Spectroscopy and Neutron Scattering

Effect of carbon dioxide on self-setting apatite cement formation from tetracalcium phosphate and dicalcium phosphate dihydrate; ATR-IR and chemoinformatics analysis

Hydrogen bonding in the crystalline state. CaHPO4 (monetite), P1 or P1? A novel neutron diffraction study

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