Room-temperature XRD patterns and R

Room-temperature XRD patterns and Raman spectra of commercial CTO powder and cold-sintered CTO-xKMO samples are shown in Fig. 1. CTO and KMO exhibit a perovskite orthorhombic(space group: Pnma, PDF card: 42-423) and a monoclinic structure(space group: C12/m1, PDF card: 29-1021), respectively. All diffraction peaks in the XRD patterns for CTO-xKMO are assigned to either CTO and KMO and the reflection intensities of KMO increase with increasing weight fraction, as labelled in Fig. 1(a). Coexistence of diffraction peaks related to CTO and KMO is found in all studied composites with 0~x~1, with no trace of impurity peaks or shift of peak positions, indicating that there is no detectable interaction between CTO and KMO. To confirm the weight fraction of each end member in the composites, full-pattern Rietveld refinement of X-ray data was conducted using a two phase mix of CTO (Pnma) and KMO (C12/m1) with CTO-0.2KMO and CTO-0.8KMO given in Fig. 1(c) and (d), respectively. Good agreementis observed between the experimental and calculated patterns with weight fractionsclose to the nominal compositions.