The phase transition of chromium substituted lithium manganese spinet oxide, LiCryMn2-yO4 was investigated by low-temperature powder X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and electrical resistivity measurements. The sample prepared at 820 degreesC resulted in lowering the transition temperature T-t with Cr composition y, whereas T-t of the sample prepared at 750degreesC remained constant for 0 less than or equal to y less than or equal to 0.17 in LiCryMn2-yO4. This would be caused by a difference in distribution of the substituted Cr3+ ion in octahedral site depending on the preparation temperature. The phase transition was suppressed with increasing the amount of Cr content. (C) 2004 Elsevier B.V. All rights reserved.