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SUMMARY:Understanding Kinetic Factors in the Formation of Yttrium Manganese
  Oxides Using Solid-State Metathesis
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20195001T000000
UID:2026-04-27-15-52-13@natsci.colostate.edu
DTSTAMP:20260427T155213
Description:Research Seminar Abstract\n\nThe discovery of functional comple
 x oxides requires the development of new low-temperature syntheses that ca
 n selectively form a desired material. Low-temperature solid-state reactio
 ns provide conditions that allow for kinetic control of the reaction pathw
 ay\, which can lead to the discovery of new materials\, or synthesis of ma
 terials that lie away from thermodynamic equilibrium (metastability). Addi
 tionally\, lower temperature reactions (&lt\;900ºC) provide conditions th
 at allow for in situ characterization of reaction pathways. Analysis of th
 ese pathways leads to an understanding of the limiting steps in a formatio
 n of these materials\, which promotes the discovery of new strategies in a
 pproaching solid-state synthetic chemistry.\n\nUsing solid-state metathesi
 s reactions with the general composition of: AMO2 + REOX → REMO3 + AX (w
 here A = alkali metal\, M = transition metal\, RE = rare-earth metal\, X =
  halide)\, the synthesis of complex oxides occurs at low temperatures (500
 -900ºC). This presentation examines how phase behavior changes with compo
 sition of precursors in the preparation of yttrium manganese oxides and ho
 w precursor composition can be used to control the formation of different 
 phases\, including metastable Y2Mn2O7. Also\, we show that the formation o
 f complex oxides is pathway dependent\, or dependent on the formation of s
 pecific intermediates. Finally\, we illustrate that these metathesis react
 ions provide a general reaction scheme for targeting complex oxides.\n\n&n
 bsp\; 4:00 pm
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