Suggested Chemistry Of Zinc Oxychloride Cements

Author

Charles A. Sorrell, Missouri University of Science and Technology

Abstract

Solutions of ZnCl₂ were prepared from ZnCl₂·nH₂O and by reaction of zinc metal with HCl. Specific gravities and pH values were determined as a function of composition. A ternary phase, 4ZnO·ZnCl₂·5H₂O, was precipitated when the ZnCl₂ solutions were diluted to a pH of 5.48 ± 0.05. Mixtures of ZnO with ZnCl, and HCI solutions were equilibrated in sealed containers and analyzed by X‐ray diffraction. The resulting phase diagram shows 2 ternary phases, 4ZnO·ZnCl₂·5H₂O (4·1·5) and ZnO·ZnCl₂·2H₂O (1.1.2), both of which are soluble to the extent of < 1 wt% in ZnCl₂ solutions. Thermogravimetric data indicate that the 1.1.2 phase loses half the constituent H₂O at ∼230°C and the remainder, with ZnCl₂, at higher temperatures. The 4.1.5 phase dissociates to ZnO and 1.1.2 at ∼160°C. The system ZnCl₂‐H₂O is not binary, but is a section through the ternary system ZnO‐HCl‐H₂O, with the solubility curve of the 4.1.5 phase intersecting the ZnCl₂‐H₂O section in dilute solutions. Copyright © 1977, Wiley Blackwell. All rights reserved

Recommended Citation

C. A. Sorrell, "Suggested Chemistry Of Zinc Oxychloride Cements," Journal of the American Ceramic Society, vol. 60, no. 5 thru 6, pp. 217 - 220, Wiley, Jan 1977.

The definitive version is available at https://doi.org/10.1111/j.1151-2916.1977.tb14109.x

Department(s)

Materials Science and Engineering

Publication Status

Full Access

International Standard Serial Number (ISSN)

1551-2916; 0002-7820

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Wiley, All rights reserved.

Publication Date

01 Jan 1977