Chemical and Thermal Expansion of Calcium-Doped Lanthanum Chromite

Thermal and Chemical Expansion of Sr-Doped Lanthanum Cobalt Oxide (La1-xSrxCoO3-δ)

“…17 ppm/°C. These values compare favorably with the CTE of other materials of perovskite structure, 16,[17][18][19][20]30,[36][37][38][39][40] including those without large chemical expansivities. The average chemical expansivity, calculated in the temperature range 600-900 °C, was found to be between 0.11 and 0.14 ppm/ ppm.…”

“…Previous workers have shown that the LSC family of perovskites expands rapidly at high temperature and constant P O 2 because of the reduction of Co (or other B-site transition-metal dopants, such as Fe, Ni, Cr, etc. ). − Subsequent studies of expansion in reduced oxides, including doped and undoped ceria, ,, doped lanthanum chromite, , and several browmillerite−perovskite intergrowth oxides, − have attempted to separate and quantify the chemical expansion (that part of the expansion due to changes in P O 2 ) from the thermal expansion. To date, however, a complete set of expansion measurements in the LSC family of perovskites (over a wide range of P O 2 and T ) have not been conducted.…”

Computer Simulations of Thermal Expansion in Lanthanum-Based Perovskites

“…The similarity in Fig. 1 was identi"ed as advantageous in prior work (2) and is easier to obtain when "tting to a single material. Fitting simultaneously to several materials of di!ering structures tends to disperse the potentials (Fig.…”

“…Descriptions of the sample preparation are given in Refs. (5) and (6) and summarized in previous papers (2,3). Calculations were limited to the fully oxidized material (heated in air, denoted &&ox'') and the fully reduced material (P(O )"10\ atm, denoted &&red'').…”

Formation Rules of Harmful Gas Products of Flame Colour Agents of Fireworks

“…25, No. 7 (2013), 3793-3795 EXPERIMENTAL Theoretical calculation: Based on the principle of free energy minimum 2,3 , this research would theoretically estimate the formation of harmful gas products from flame colour agents of red, green, blue, yellow which is commonly used in the producing of typical fireworks for export. Formula of flame colour agents for research is shown in Table-1.…”