Variable temperature laser light scattering microscopy studies on high purity 10–100 μm Ag and Ti metal particles

Abstract

Behaviour of 10–100 μm sized Ag and Ti metal particles was studied by employing laser light scattering microscopy while increasing the temperature at different rates. Differential area ω was defined as 2(A_max−A_min)/(A_max+A_min), and its significance as strain variation response is established. The ω versus dT/dt curves of Ag and Ti were exponential in nature, with positive and negative slopes respectively. The role of smallness of the metal particles vis-à-vis defects was considered. Systematic variation of surface activity S_a with rate of heating is noticed. A plausible reasoning is offered to explain the experimental results qualitatively.

Keywords:

• Variable temperature laser light scattering microscopy
• Silver and titanium metal particles
• Deep defocus condition
• Surface activity
• Rate of heating

The study reported in the present paper is part of a project funded by DRDO, Government of India, New Delhi (project no. ERIP/ER/0102083/M/01). Laboratory assistance by P. Sitarama Rao is acknowledged. Professor Prasad passed away just after the communication of this paper. PBSK dedicates the paper to Professor Prasad.