• Company
    • About
    • Products and markets
    • Management
    • History
    • Development Strategy
    • Business Diversification
    • Contacts
    • Encyclopedia
    • Public Reporting
  • Enterprises
  • Sustainable development management
    • Environmental
    • Approaches to Sustainable Development Management
    • CSR contact
    • Social responsibility
    • Support for Social Entrepreneurship
    • Public Reporting System
  • Press center
    • News
    • Photo
    • Video
    • Contacts for mass media
  • RU

Encyclopedia menu

  • About
  • Products and markets
  • Management
  • History
  • Development Strategy
  • Business Diversification
  • Contacts
  • Encyclopedia
    • Uranium history
    • Types and properties
      • Physical Properties
      • Chemical Properties
      • Geochemical Peculiarities
      • Commercial Types of Uranium Deposits
      • Classification of Resources of Uranium Deposits
      • Major World Uranium Deposits
    • Uranium mining
      • Open Pit/Underground Mining
      • Heap Leaching
      • In-Situ Leaching (ISL)
    • Uranium and ecology
  • Public Reporting
Company / Encyclopedia / Types and properties / Physical Properties

Physical Properties

Metallic uranium in pure form is a solid shiny silvery metal which when exposure to air covers with a thin oxide film. It exists in three crystalline modifications — α, β and γ: α-uranium when heated to 662оC transforms into β-uranium which in its turn at 772оC transforms into γ-uranium. Metallic uranium is a poor electrical conductor, its electrical conductivity is almost twice as low as that of iron. Heat capacity of metallic uranium is 3.3 times lower than that of copper, and thermal conductivity is approximately three times less than that of stainless steel, and 13 times less than that of copper. By magnetic susceptibility it is a paramagnetic element and may form non-ferromagnetic alloys.

Atomic mass of natural uranium is 238.0289 atomic units. It is a mixture of three isotopes:

Uranium Isotopes
Content in Natural Uranium, %
Half Life, years
U238
99,2742
4,468 x 109
U235
0,7202
7,04 x 108
U234
0,0056
2,44 x 105

All uranium isotopes are radioactive. Two of them — U238 and U235 — form decay chains that end in stable non-radioactive isotopes of lead Pb206 and Pb207 and helium. U234 isotope is one of intermediate nuclides of U238 decay chain. Intermediate products that have practical value are radium Ra226 and radon Rn222. When nuclear decay of U238 and U235 occurs they emit secondary neutrons which under certain conditions may cause decay of other nucleus. Fission chain reaction is possible if the number of secondary neutrons is at least equal to the number of neutrons causing fission reaction, i.e. neutron multiplication factor must be ≥ 1. If it is maintained at the level of one, it causes nuclear combustion which forms the basis for wide use of uranium in nuclear power engineering.

Physical Properties of a-Uranium
Density, kg/cu.m
18,7 х 103
Brinell hardness, MPa
19,6 — 21, bhu2
Melting point
1408K
Boiling point
4091K
Superconducting transition point
0,98
Ultimate yield strength MPa
272 — 470
Thermal conductivity, Wt/m*K
22,5
Heat capacity, J/К
27,66
Linear expansion factor, k −1
10,7
Electric conductivity, Ohm*m
29,0 x 10-4
Specific magnetic susceptibility, nTsl
1,72 x 10-6
  • RU
  • Company
    • About
    • Products and markets
    • Management
    • History
    • Development Strategy
    • Business Diversification
    • Contacts
    • Encyclopedia
      • Uranium history
      • Types and properties
        • Physical Properties
        • Chemical Properties
        • Geochemical Peculiarities
        • Commercial Types of Uranium Deposits
        • Classification of Resources of Uranium Deposits
        • Major World Uranium Deposits
      • Uranium mining
        • Open Pit/Underground Mining
        • Heap Leaching
        • In-Situ Leaching (ISL)
      • Uranium and ecology
    • Public Reporting
  • Enterprises
  • Sustainable development management
    • Environmental
    • Approaches to Sustainable Development Management
    • CSR contact
    • Social responsibility
      • Key Projects (2014-2020)
    • Support for Social Entrepreneurship
      • Program Implementation (2017)
    • Public Reporting System
      • Annual Reports (2014-2017)
  • Press center
    • News
    • Photo
    • Video
    • Contacts for mass media
  • RU
For cookies eng: This website uses cookies. By continuing to use this website, you agree to our cookie policy. Read more
Contacts
© 2007-2022 JSC Atomredmetzoloto
Print version
Contacts
© 2007-2022 JSC Atomredmetzoloto
  • RU

Cookies

We use cookies and similar tools across our websites to improve their performance and enhance your user experience.

What are cookies?
Cookies are small text files which a website may put on your computer or mobile device when you first visit a site or page. The cookie will help the website, or another website, to recognize your device the next time you visit. Web beacons or other similar files can also do the same thing. We use the term “cookies” in this policy to refer to all files that collect information in this way.

There are many functions cookies serve. For example, they can help us to remember your username and preferences, analyze how well our website is performing, or even allow us to recommend content we believe will be most relevant to you.

Certain cookies contain personal information – for example, if you click to “remember me” when logging in, a cookie will store your username. Most cookies won’t collect information that identifies you, and will instead collect more general information such as how users arrive at and use our websites, or a user’s general location.

Does anyone else use cookies on ARMZ websites?
Advertisers sometimes use their own cookies to provide you with targeted advertising. For example, advertisers may use a profile they have built on sites that you have previously visited to present you with more relevant advertisements during your visit to our site. We believe that it is useful to our users to see advertisements that are more relevant to their interests. If you are based in the European Union and would like to learn more about how advertisers use these types of cookies or to choose not to receive them, please visit www.youronlinechoices.eu.

We also use or allow third parties to serve cookies that fall into the four categories above. For example, like many companies, we use Google Analytics to help us monitor our website traffic. We may also enable third parties to serve cookies to help to identify fraudulent or non-human traffic on some of our websites. We may also use third party cookies to help us with market research, revenue tracking, improving site functionality and monitoring compliance with our terms and conditions and copyright policy.

Can a website user block cookies?
As we’ve explained above, cookies help you to get the most out of our websites. However, if you do wish to disable our cookies then please follow the instructions on https://www.wikihow.com/Disable-Cookies. Please remember that if you do choose to disable cookies, you may find that certain sections of our website do not work properly.

Do we track whether users open our emails?
Our emails may contain a single, campaign-unique “web beacon pixel” to tell us whether, and how many times, our emails are opened and verify any clicks through to links or advertisements within the email. We may use this information for purposes including determining which of our emails are more interesting to users, to query whether users who do not open our emails wish to continue receiving them, to check that content is being used in accordance with our terms and conditions, and to inform our advertisers in aggregate how many users have clicked on their advertisements. The pixel will be deleted when you delete the email. If you do not wish the pixel to be downloaded to your device, you should select to receive emails from us in plain text rather than HTML.

More detail on how businesses use cookies is available at www.allaboutcookies.org.

If you have any queries regarding this Cookie Policy please contact our Privacy Officer by e-mail at pr@armz.ru.