Thermoanalytische untersuchung von sekundärem calciumphosphatdihydrat

Berend, G; Hegedüs, A. J.

doi:10.1016/0040-6031(75)80004-9

Cited by 14 publications

(13 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Eventhough the authors did not measure the particle size of their CHPD powders, it is believed that the CHPD powders could have the particle size corresponding to two step dehydration process. Further it has been reported [14,15] that 25% of the hydration water of brushite is lost between 85 and 140 °C, 50% between 115 and 170 °C and total dehydration is achieved between 130 and 240 °C, when the phase transition from brushite to monotite occurs. Therefore, the peak at 105 °C is related to the partial dehydration of brushite (Eq.…”

Section: Resultsmentioning

confidence: 99%

Growth and characterization of calcium hydrogen phosphate dihydrate crystals from single diffusion gel technique

Rajendran

Keefe

2010

Cryst. Res. Technol.

View full text Add to dashboard Cite

Calcium hydrogen phosphate dihydrate (CaHPO 4 ·2H 2 O, CHPD) a dissolved mineral in urine is known to cause renal or bladder stones in both human and animals. Growth of CHPD or brushite using sodium metasilicate gel techniques followed by light and polarizing microscopic studies revealed its structural and morphological details. Crystal identity by powder x-ray diffraction confirmed the FT-IR and FT-Raman spectroscopic techniques as alternate methods for fast analysis of brushite crystals which could form as one type of renal stones. P-O-P asymmetric stretchings in both FT-IR (987.2 cm -1 , 874.1 cm -1 and 792 cm -1) and FT-Raman (986.3 cm -1 , 1057.6 cm -1 and 875.2 cm -1 ) were found as characteristics of brushite crystals. Differential Scanning Calorimetry (DSC) analysis revealed brushite crystallization purity using gel method by studying their endothermic peaks. This study incorporated a multidisciplinary approach in characterizing CHPD crystals grown in vitro to help formulate prevention or dissolution strategy in controlling urinary stone growth. Initial studies with 0.2 M citric acid ions as controlling agent in the nucleation of brushite crystals further support the presented approach.

show abstract

Section: Resultsmentioning

confidence: 99%

Growth and characterization of calcium hydrogen phosphate dihydrate crystals from single diffusion gel technique

Rajendran

Keefe

2010

Cryst. Res. Technol.

View full text Add to dashboard Cite

show abstract

“…This was explained by a more stable structure of the latter [59]. The dehydratation of CuSQ.5H20 [60], natural zeolites [61], synthetic zeolites [62], double salt hydrates [63], selenate hydrates of Mb(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) [64] and CaHPO~.2H20 [65], and the desolvatation of RbF.HAc solvate [66] have been studied by thermal analysis.…”

Section: ~Qimon: Novel Multiple Methods In Thermal Analysismentioning

confidence: 99%

Novel multiple methods and results in thermal analysis

Simon

1976

Journal of Thermal Analysis

View full text Add to dashboard Cite

“…As can be seen in figure, the curve shows two endothermic peaks, a broad one at around 163.4 ∘ C corresponding to the onset of evaporation of the hydration water and a welldefined peak at 189.4 ∘ C associated with a phase transition in the crystals. Further it has been reported [10,11] that 25% of the hydrated water of CHPD is lost between 85 and 140 ∘ C, 50% between 115 and 170 ∘ C, and total dehydration is achieved between 130 and 240 ∘ C. Therefore, the peak at 163.4 ∘ C corresponds to partial dehydration (3) and the prominent peak at 189.4 ∘ C corresponds to total dehydration and monotite formation of Sm:CHPD (4). However, the thermograms of the CHPD crystal grown by Rajendran and Dale Keefe [12] show two endothermic peaks, a broad one at around 105 ∘ C corresponding to the onset of evaporation of the hydration water and a well-defined peak at 160 ∘ C associated with a phase transition in the crystals.…”

Section: Thermal Behaviormentioning

confidence: 99%

Preparation of Samarium Doped Calcium Hydrogen Phosphate and Study of Its Density and Thermal and Dielectric Characteristics

Bamzai

Slathia

Raina

et al. 2014

Indian Journal of Materials Science

View full text Add to dashboard Cite

Samarium doped calcium hydrogen phosphate was synthesized as single crystal by room temperature solution growth technique, namely, silica gel technique. The kinetics of the growth parameters was studied with regard to variation of pH, dopant concentration, gel ageing, and upper reactant concentration. The optimum conditions for the growth of good quality single crystal were worked out. Single crystal X-ray diffraction analysis establishes that the crystal belongs to monoclinic system. The density observed by the flotation method is greater than the density of the reported pure calcium hydrogen phosphate thereby suggesting the incorporation of the dopant (Sm) ion into the lattice of host (CHP). Thermal analysis gave two sharp endothermic peaks which are due to partial dehydration and phase transition, respectively. Dielectric studies establish a shift in the Curie temperature from 355 to 370°C only at higher frequencies thereby suggesting the relaxational behavior of the material.

show abstract

Thermoanalytische untersuchung von sekundärem calciumphosphatdihydrat

Cited by 14 publications

References 21 publications

Growth and characterization of calcium hydrogen phosphate dihydrate crystals from single diffusion gel technique

Growth and characterization of calcium hydrogen phosphate dihydrate crystals from single diffusion gel technique

Novel multiple methods and results in thermal analysis

Preparation of Samarium Doped Calcium Hydrogen Phosphate and Study of Its Density and Thermal and Dielectric Characteristics

Contact Info

Product

Resources

About