Abstract
Robert Cahnin News and Views1 discusses work by Sleight's group2,3 demonstrating that the phase ZrW2O8 has a negative thermal expansion. But the conclusion is not novel: this phase is one of many known for decades to exhibit the phenomenon. (Three relevant reviews4,5,6 were not cited in the News and Views article.) Further, Sleight's group and Cahn both fail to note the discovery of the very significant, incredibly large NZP-CTP (NaZr2P3O12or Ca0.5Ti2P3O12) structural family first found by us7, subsequently studied by many groups and now commercialized. (Individual references to other relevant publications can be found in refs 4-6. A bibliography containing 100 articles on the NZP family, including references to the examples mentioned below, is available on request from the authors.)
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References
Cahn, R. W. Nature 386,22–23 (1997).
Evans, J. S., Mary, T. A., Vogt, T., Subramanian, M. A. & Sleight, A. W. Chem. Mater. 8,2809–2823 (1996).
Mary, T. A., Evans, J. S. O., Vogt, T. & Sleight, A. W. Science 272,90–92 (1996).
Chu, C. N., Saka, N. & Suh, N. P. Mater. Sci. Eng. 95,303(1987).
Roy, R., Agrawal, D. K. & McKinstry, H. A. Annu. Rev. Mater. Sci. 19,59–81 (1989).
Agrawal, D. K. J. Mater. Educ. 16,139(1994).
Alamo, J. & Roy, R. J. Am. Ceram. Soc. 67, C78 (1984).
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Roy, R., Agrawal, D. Thermal-expansion materials not so new. Nature 388, 433 (1997). https://doi.org/10.1038/41243
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DOI: https://doi.org/10.1038/41243
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