Pb2FeReO6: new defect pyrochlore oxide with a geometrically frustrated Fe/Re sublatticeElectronic supplementary information (ESI) available: powder XRD patterns of pyrochlores Pb2FeReO6.1 and Pb2FeReO5.81. See http://www.rsc.org/suppdata/jm/b3/b304118m/
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