Layered atomic structures of double oxides for low shear strength at high temperatures

Double oxide phases combining a transition metal and a noble metal have recently become a subject of investigation as solid lubricant materials for high-temperature tribological applications. Here, we study the changes in chemistry and crystal structure of silver molybdate (Ag 2Mo 2O 7) and silver t...

Full description

Saved in:
Bibliographic Details
Published inScripta materialia Vol. 62; no. 10; pp. 735 - 738
Main Authors Stone, D., Liu, J., Singh, D.P., Muratore, C., Voevodin, A.A., Mishra, S., Rebholz, C., Ge, Q., Aouadi, S.M.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2010
Subjects
Ab initio calculations
Crystal structure
Friction
Oxides
Raman spectroscopy
Oxides
Ab initio calculations
Friction
Raman spectroscopy
Crystal structure
Online AccessGet full text
ISSN1359-6462
1872-8456
DOI10.1016/j.scriptamat.2010.02.004

Cover

More Information
Summary:Double oxide phases combining a transition metal and a noble metal have recently become a subject of investigation as solid lubricant materials for high-temperature tribological applications. Here, we study the changes in chemistry and crystal structure of silver molybdate (Ag 2Mo 2O 7) and silver tungstate (Ag 2WO 4) thin films and powders from 25 to 600 °C. We show, using ab initio molecular dynamics, high-temperature X-ray diffraction, high-temperature Raman spectroscopy and differential scanning calorimetry in combination with sliding tests, that the layered atomic structure of silver molybdate facilitates sliding, resulting in a low coefficient of friction (<0.2) from 300 to 500 °C.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.02.004