Synthesis and characterization of charge-substituted garnets YCaLnGa{sub 5}O{sub 12} (Ln = Ce,Pr,Tb)
- Argonne National Lab., IL (United States)
A low temperature method is described for the preparation of the new garnet compounds YCaLnGa{sub 5}O{sub l2} (Ln=Ce, Pr, Th). In this set of compounds (Ca{sup 2+} + Ln{sup 4+}) replaces 2 Y{sup 3+} in the parent gallium based garnet Y{sub 3}Ga{sub 5}O{sub l2} in order to stabilize as effectively as possible the Ln{sup 4+} species in the eight-coordinate ``A`` site of the garnet structure. Characterization of the oxides by x-ray powder diffraction and thermogravimetric analysis is discussed with regard to the structural relationship of the substituted compound to the parent material. The tetravalent ions Pr{sup 4+} and Tb{sup 4+} exhibit increased thermal stability in reducing conditions as compared to the Ln{sup 4+} states in the fluorite (LnO{sub 2}) and perovskite (BaLnO{sub 3}) type structures. This result is discussed with reference to the complex crystal chemistry of these systems.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10185175
- Report Number(s):
- ANL/CHM/CP-79242; CONF-9309142-4; ON: DE93040227; TRN: 93:022851
- Resource Relation:
- Conference: 20. rare earth research conference,Monterey, CA (United States),12-17 Sep 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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