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Muon spin relaxation investigation of the 9R-related phase change in lithium and sodium

Lithium and sodium have been studied by the muon spin relaxation technique. When cooling the lithium, the 9R-related phase was first observed at 73 K, below 50 K this environment was the dominant one for the muons. In sodium, evidence was found that a significant part of the sample was in the 9R-related phase at 45 K. In both samples the muons diffused rapidly in the BCC phase, and in lithium they were clearly static in the 9R phase below 20 K.