Fig. 1b showstheXRDpatternsoftheas-spun fibers andcal-
cined CaMnO3 nanofibers. Theas-spun fibers showedabroadpeak
around2ɵ¼17° correspondingtoorthorhombicPAN(110)reflection
[20]. Fiberscalcinedat700 °C, gavediffractionpeakswithlow
intensities,andnonewereassignedtoanycrystallinephases.Fi-
bers calcinedat800 °C, showedcharacteristicdiffractionpeaksof
CaMnO3 (JCPDS no.50-1746)withtheorthorhombicperovskite
structure inthe Pnma space group [21]. Withincreasingcalcina-
tion to900 °C, thediffractionpeaksbecamesharperwithhigher
intensity,indicatingincreasedcrystallinityofCaMnO3.