 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 5]](bk0150fig5mag.jpg)
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Figure 5
NH4Cl – a suite of experimental results for ammonium chloride. (a) Specific heat as a function of temperature for NH4Cl (Simon, 1922  ; values tabulated on pp. 256–257 of Simon's paper; see also his Fig. 3); (b) cell dimensions as a function of temperature (Hovi et al., 1973; values from Tables 2 and 3 of their paper; see also their Fig. 1). The spread of values below 242 K was considered to be indicative of hysteresis (see their Fig. 2), but this was not explained and has not been taken into account here; (c) thermal expansion as a function of temperature, calculated from (b) (Hovi et al., 1973; their Table 5 and Fig. 4); (d) central portion of Cp–T curves given by Chihara & Nakamura (1972) who give details of other experimental results included here. The excellent agreement between the results of Simon (1922) and those of Chihara & Nakamura (1972) is noteworthy. The premonitory region found on heating is shown; (e) central portion of cell dimension–temperature curve showing indications of a premonitory region. Curves are guides to the eye. |
![[Figure 5]](bk0150fig5.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
