Buy article online - an online subscription or single-article purchase is required to access this article.
Download citation
Download citation
link to html
The temperature dependence of the lattice constant for the parent phase in metallic sodium, which has a body-centred cubic (b.c.c.) structure, has been measured by an X-ray single-crystal diffraction method over a range of 20 to 293 K. An abnormal change of the lattice constant at around 40 K is shown, which is attributed to small regions of the low-temperature phase. On the other hand, the value of the full width at half-maximum (FWHM) for the (110)b.c.c. Bragg reflection increased gradually with decreasing temperature and then changed drastically at around 40 K. This result was inconsistent with the neutron diffraction one: the value was constant down to the phase-transition temperature and changed drastically at that temperature. The FWHM for the X-ray experiment is very sensitive to the size of the specimen and sample mount because the external strain originating from contraction of the sample holder is often introduced into the specimen.

Subscribe to Journal of Applied Crystallography

The full text of this article is available to subscribers to the journal.

If you have already registered and are using a computer listed in your registration details, please email support@iucr.org for assistance.

Buy online

You may purchase this article in PDF and/or HTML formats. For purchasers in the European Community who do not have a VAT number, VAT will be added at the local rate. Payments to the IUCr are handled by WorldPay, who will accept payment by credit card in several currencies. To purchase the article, please complete the form below (fields marked * are required), and then click on `Continue'.
E-mail address* 
Repeat e-mail address* 
(for error checking) 

Format*   PDF (US $40)
In order for VAT to be shown for your country javascript needs to be enabled.

VAT number 
(non-UK EC countries only) 
Country* 
 

Terms and conditions of use
Contact us

Follow J. Appl. Cryst.
Sign up for e-alerts
Follow J. Appl. Cryst. on Twitter
Follow us on facebook
Sign up for RSS feeds