Phase transitions and thermal expansion in langbeinite type compounds

摘要: Abstract We report thermal expansion measurements using capacitance dilatometric methods on several polar and non-polar compounds of the langbeinite family, from liquid helium to room temperature. In K 2 Mn (SO 4 ) 3 Tl Cd new anomalies indicative phase transitions were detected. Similarly, two detected for first time at 227.8 330.8 respectively in Mg . (NH discovered 220 241 with decreasing temperature, although increasing temperature only one transition could be