... and homogeneous heating compared with a conventional laser-heated DAC and thus allows us to conduct more reliable diffusion experiments under high pressure. We determined the coefficients of Fe–nickel (Ni) interdiffusion in the Fe–Si 2 wt% alloy. The obtained diffusion coefficients follow a homologous temperature...

... archipelago. In this work, we aim to complete the previously published internally consistent database by focusing on the interdiffusion of eight major elements (Si, Al, Ti, Fe, Mg, Ca, Na, and K) occurring between nominally dry (ca. 0.02 wt% H 2 O) shoshonitic and rhyolitic melts at atmospheric pressure...

...Ralf Dohmen; Jan H. Ter heege; Hans-Werner Becker; Sumit Chakraborty Abstract We have measured Fe-Mg interdiffusion coefficients, D Fe-Mg , parallel to the three main crystallographic axes in two natural orthopyroxene single crystals [approximately En 98 Fs 1 ( X Fs = X Fe = 0.01) and En 91 Fs 9...

... and polycrystalline D-doped brucite showed an asymmetric pattern characterized by faster diffusion in aggregates. The D/H interdiffusion rate determined from the analysis of the single crystal side indicates that the interdiffusion rate increases with increasing H/D ratio. The H-D interdiffusion rate in the direction...

...V.N. Korolyuk; G.G. Lepezin Abstract Literature data on the coefficients of heterovalent NaSi–CaAl interdiffusion in plagioclases are analyzed. It is shown that activation energy and frequency factor decrease as the partial pressure of water and plagioclase basicity increase. A general expression...

...Alexandre Dimanov; Michael Wiedenbeck Abstract We investigated (Fe,Mn)-Mg interdiffusion along the [001] axis in single crystals of natural diopside at ambient pressure, at temperatures between 1000°C to 1200°C and at oxygen fugacities between 10 −18.5 atm to 10 −6 atm. Thin layers (~350–550 Å...

...Alexandre DIMANOV; Violaine SAUTTER Abstract (Fe,Mn)-Mg interdiffusion has been investigated in single crystals of natural diopside at ambient pressure, high temperatures (900°C to 1240°C) and low oxygen fugacity (pO 2 ≈ 10 −18 atm to 10 −13 atm). Interdiffusion couples were made...

...Don R. Baker Abstract Interdiffusion experiments between peralkaline fluoridated melts of rhyolitic and dacitic composition (with ∼ 1.3 wt% F) at 1200–1600°C, 1.0 G P a, have yielded effective binary diffusion coefrcients for Si. Similar interdiffusion experiments between a natural peralkaline...

...Ming Liu; Richard A. Yund Abstract Average NaSi-CaAl interdiffusion coefficients ( D̃ ) have been determined for the plagioclase Huttenlocher interval (~An 70 to ~An 90 ) using the method of lamellar homogenization at 1500 MPa, 1050 to 900 °C, ∼1.0 wt% H 2 O added, and fugacities fixed...

... in the various lithologic units in the macrodikes and experimental observations involving liquid immiscibility and silicate liquid interdiffusion suggests that chemical equilibrium between the magma reservoirs was approached through diffusive element exchange. Geological Society of America 1989 ...

...Toshio Mizuta Abstract The interdiffusion coefficients of zinc and iron in natural iron-poor and iron-rich sphalerites were determined experimentally using electron microprobe analysis. The diffusion couples were heated in sealed silica tubes for predetermined lengths of time together with f (sub S...

...Sarah A. Hokanson; Richard A. Yund Abstract Lamellar homogenization rates were used to determine “average” interdiffusion coefficients ( D ) for seven largely disordered cryptoperthites with relatively straight, coherent lamellae and <1.6 mol% An and for two highly ordered samples...

...John B. Brady; Richard A. Yund Abstract The rates of homogenization of coherent exsolution lamellae in cryptoperthites have been used to evaluate K-Na interdiffusion in alkali feldspars. An “average” interdiffusion coefficient ( D ) is between 2 and 4 x 10 -17 cm 2 /sec for a synthetic...

...Nabil Z. Boctor; John B. Brady Abstract Diffusion coefficients for S–Se interdiffusion in tiemannite (HgSe) single crystals have been determined in the temperature range 500°–700°C. The measured diffusivities may be fit by the equation D = ( 5.7 × 10 − 12 ) exp ⁡ − 105 , 000 8.314 T cm 2 / sec...