Characteristics and Structure of Hopeite-Mineral (Type A3(PO4)2.4H2O)
DOI:
https://doi.org/10.24203/ajas.v7i1.5707Abstract
The aim of the study was to gain more information about the structural changes during the dewatering reactions of the above compounds. The paper is focus on the low-temperature absorption of hopeite clay mineral, afterward the phases are examined for the dependence of temperature at different pressures. Hopeite shows signs of a phase transformation. Their use for the dental cement industry as a lubricant for cold-rolling mills is to be emphasized, such as coating with phosphate mineral or carbonaceous crystal. This is shown by the appearance of the new reflexes. The observed changes take place below the dewatering known from the literature. The phase change was investigated using a neutron scattering experiment. A temperature-pressure phase diagram of the dewatering could be set up in the range of 275 K to 380 K and 10-3 mBar to 103 mBar with the temperature-dependent powder diffractometer at different pressures and the temperature-dependent neutron scattering experiment. In this work, it has been proved that the dewatering of the hopeite is dependent on pressure and that the dewatering process of the hopeite is a reversible process.References
Calvo C. (1963), The Crystal Structure of ɤ- Zn3(PO4)2, Phys. Chem. Solids, 24, 141.
Calvo C. (1965), The Crystal Structure of ɤ- Zn3(PO4)2, Can. J. Chem. 43, 436.
Hill R.J. and Jones J.B (1976), The Crystal Structure of Hopeit, Am. Mineral., 61, 987-995.
JCPDS - PC – PDF von ICDD, International Center of Diffraktion Data, Version 2.14.
Kleber. Bautch. Bohm (1990). Einführung in die Kristallographie, 17.Aufl., Verlag Technik Berlin. München.
Liebau F. (1962), Ãœber die Struktur des Hopeits, Chem. D. Erde, 22, 430.
Mamedow, C.S. Gamidow, R.G, und Below N.W. (1961), Crystal Structure of Hopeit, Zn3(PO4)2.4H2O, Kristallogr. 6, 144 (russ).
Rietveld R.M. (1967), Line Profile of Neutron Powder Diffraction Peaks for Structure Refinement, Acta Cryst. 22, 155-152.
Shchegrov L.N. (1986), Thermolylis of Orthorombic Hopeit, Zn3(PO4)2.4H2O, Ukrainian Agricultural Acadeny. Translated from Izvestya Academy Nauk SSSR, Neorganeski Materialy, vol. 22, No.1, PP.157-159, Original Article Submitted May 29th, 1984.
Stephens J.S., and Calvo C. (1967), The Crystal Structure of β- Zn3(PO4)2, Can. J. Chem. 45, 2303.
Touloukian Y.s., Kirby R.K., Taylor R.E., Lee T.Y.R.(1975), Thermal Expansion Metallic Elements and Alloy (1975), Vol.13 of ThermoPhysical Properties of Mater, pp.154-162, New York Washington.
Wolve C.W.(1940), Clasification of Minerals of The Type A3(XO4)2.nH2O, Amer. Miner., 25,787.
Whitker A. (1975), The Crystal Structure Of Hopeit, Zn3(PO4)2.4H2O, Acta Cryst. B31, 2026.
Wilson A.J.C. (1992), International Tables Of Crystalofraphie, (Mathematical, Physical and Chemical Tables), Volume C.
Downloads
Published
Issue
Section
License
- Papers must be submitted on the understanding that they have not been published elsewhere (except in the form of an abstract or as part of a published lecture, review, or thesis) and are not currently under consideration by another journal published by any other publisher.
- It is also the authors responsibility to ensure that the articles emanating from a particular source are submitted with the necessary approval.
- The authors warrant that the paper is original and that he/she is the author of the paper, except for material that is clearly identified as to its original source, with permission notices from the copyright owners where required.
- The authors ensure that all the references carefully and they are accurate in the text as well as in the list of references (and vice versa).
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Attribution-NonCommercial 4.0 International that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
- The journal/publisher is not responsible for subsequent uses of the work. It is the author's responsibility to bring an infringement action if so desired by the author.
