Unusual phase transitions in Pb1-xSnxTe1-ySeyand Pb1-xSnxTe1-ySy, crystals induced by sn off-center ions Lebedev, A. I. ; Sluchinskaya, I. A. Abstract Publication: Ferroelectrics Pub Date: June 1993 DOI: 10.1080/00150199308008317 Bibcode: 1993Fer...143...91L