2015/10/06 by Linda Schwarz, Zbigniew Galazka, Thorsten M. Gesing +1 · 2 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Crystallography #Drop (telecommunication) #Gallium #Magnesium #Materials science #Metallurgy #Microwave Dielectric Ceramics Synthesis #Mineralogy #Nuclear materials and radiation effects #Single crystal #Spinel #Thermal #Thermal analysis #Thermal diffusivity #Thermal properties of materials #Thermodynamics #cond-mat.mtrl-sci
paper · pdf · doi:10.1002/crat.201500275
published as Cryst. Res. Technol. 50 (2015) 961-966 · 6 pages, submitted to Crystal Research & Technology
arxiv created 2015/10/06 · openalex publication_date 2015/12/01 · arxiv updated 2015/12/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Measurements of thermal diffusivity κ (using laser flash analysis) for temperatures from 100 °C to 1200 °C and of the inversion parameter x (using X‐ray analysis) for the single crystal spinel MgGa 2 O 4 have been performed. X‐ray analysis showed a small change in x for samples annealed at 800 °C (x = 0.838) and 1200 °C (x = 0.834). Thermal diffusivity revealed a significant rise of κ for temperatures higher than 950 °C, deviating from the typical 1/T drop of κ. An additional systematic rise of κ with time is observed for temperatures between 950 °C and 1100 °C. A connection between cation disordering processes typical for spinels at elevated temperatures and the observed deviation of κ is proposed: Data indicate that cations changing their occupancy site at equilibration processes contribute significantly to κ and therefore represent a new type of heat transport.