Published May 17, 2005
| Version v1
Journal article
Analysis of the effects of thermal treatments on CaHPO4 by 31P NMR spectroscopy
Creators
- 1. Laboratoire de l'etat Solide, Faculte des Sciences de Sfax, BP 802, 3018 Sfax (Tunisia)
Description
The compound CaHPO4 was obtained by slow evaporation at room temperature. The sample was characterised by X-ray diffraction, differential scanning calorimetry and 31P MAS NMR spectroscopy at different annealing temperature. At room temperature, the observed values of the 31P NMR chemical shift for the title compound are found to be -1.6, -0.4 and 1.4 ppm with the proportions 1/4, 1/2 and 1/4, respectively, revealing the presence of three non-equivalent phosphorus sites in the structure. The 31P NMR investigation at different annealing temperatures points to a conversion of (HPO42-) into (P2O74-) at high temperature
Additional details
Identifiers
- DOI
- 10.1016/j.jallcom.2004.10.025;
- PII
- S0925-8388(04)01369-6;
Publishing Information
- Journal Title
- Journal of Alloys and Compounds
- Journal Volume
- 394
- Journal Issue
- 1-2
- Journal Page Range
- p. 13-18
- ISSN
- 0925-8388
- CODEN
- JALCEU
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 37054517
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ANNEALING; CALCIUM PHOSPHATES; CALORIMETRY; CHEMICAL SHIFT; EVAPORATION; NUCLEAR MAGNETIC RESONANCE; PHOSPHORUS 31; SPECTROSCOPY; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; COHERENT SCATTERING; DIFFRACTION; HEAT TREATMENTS; ISOTOPES; LIGHT NUCLEI; MAGNETIC RESONANCE; NUCLEI; ODD-EVEN NUCLEI; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHOSPHATES; PHOSPHORUS COMPOUNDS; PHOSPHORUS ISOTOPES; RESONANCE; SCATTERING; STABLE ISOTOPES; TEMPERATURE RANGE
Optional Information
- Copyright
- Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.