Structural and Electrical Properties of CFO Nanoparticle- Filled PVA

Structure and magnetism of electrospun porous high-entropy (Cr1/5Mn1/5Fe1/5Co1/5Ni1/5)3O4, (Cr1/5Mn1/5Fe1/5Co1/5Zn1/5)3O4 and (Cr1/5Mn1/5Fe1/5Ni1/5Zn1/5)3O4 spinel oxide nanofibers

“…104 In CoFe 2 O 4 , the F 2g (1), E g , F 2g (2), F 2g (3) and A 1g modes are located at 162, 302, 463, 613 and 678 cm À1 , respectively. 105 In magnetite (FeFe 2 O 4 ), the F 2g (1) is not detected, while the E g , F 2g (2), F 2g (3) and A 1g modes appear at 312, 474, 548 and 677 cm À1 , respectively. 95 The same occurs in FeCr 2 O 4 , where the E g , F 2g (2), F 2g (3) and A 1g modes are detected at 436, 493, 591 and 674 cm À1 , respectively.…”

“…100,101 The A 1g mode is due to the vibration along the direction joining an oxygen atom to the tetrahedral M 2+ cation and usually appears between 600 and 720 cm À1 . 95,99,[102][103][104][105] The E g mode, detected between 250 and 360 cm À1 , [103][104][105] is associated to symmetric bending of O 2À anion with respect to octahedral M 3+ cation. 103 The F 2g (1) mode, appearing between 160 and 220 cm À1 , [103][104][105] originates from translation motion of M 3+ -O 2À , while higher frequency F 2g (2) and F 2g (3) modes, between 440 and 590 cm À1 , 95,[102][103][104] arise from the asymmetric stretching and asymmetric bending of oxygen, respectively.…”

“…95,99,[102][103][104][105] The E g mode, detected between 250 and 360 cm À1 , [103][104][105] is associated to symmetric bending of O 2À anion with respect to octahedral M 3+ cation. 103 The F 2g (1) mode, appearing between 160 and 220 cm À1 , [103][104][105] originates from translation motion of M 3+ -O 2À , while higher frequency F 2g (2) and F 2g (3) modes, between 440 and 590 cm À1 , 95,[102][103][104] arise from the asymmetric stretching and asymmetric bending of oxygen, respectively. 104 Both positions of the Raman bands and their relative intensities strongly vary within the family of spinels.…”

“…104 Both positions of the Raman bands and their relative intensities strongly vary within the family of spinels. 95,98,[104][105][106][107][108] Just to cite some cases, the most intense A 1g mode is detected at 630 cm À1 in ZnFe 2 O 4 and 690 cm À1 in NiFe 2 O 4 ; 104 the E g mode, located at 320 cm À1 in NiFe 2 O 4 , downshifts at 250 cm À1 in ZnFe 2 O 4 , 104 whereas the F 2g (1), F 2g (2) and F 2g (3) modes appear respectively at 180, 470 and 570 cm À1 in NiFe 2 O 4 and at 160, 350 and 450 cm À1 in ZnFe 2 O 4 . 104 In CoFe 2 O 4 , the F 2g (1), E g , F 2g (2), F 2g (3) and A 1g modes are located at 162, 302, 463, 613 and 678 cm À1 , respectively.…”

CoFe2O4 Nanoparticles Grown within Porous Al2O3 and Immobilized on Graphene Nanosheets: A Hierarchical Nanocomposite for Broadband Microwave Absorption

“…The single and sharp 2D peak indicated the almost single-layer nature of this Gr. The Raman spectrum of CF (Figure S3b) displayed peaks at 456 cm –1 ( T 2g vibrational mode of octahedral iron), 589 cm –1 (vibrational mode of an oxygen anion at tetrahedral sites (MO 4 )), and 662 cm –1 (A 1g vibrational mode of tetrahedral cobalt). , In the case of PA, the absence of any distinct peak in 200–1200 cm –1 indicated the γ phase of Al 2 O 3 , and the broad peak that is centered at ∼1309 cm –1 (Figure S3c) can be assigned as the Al–O bending vibrations in the octahedral structure . In the case of the (60PA-40CF) 90 -Gr 10 sample (Figure b), the peaks were observed at 474 cm –1 ( T 2g of CF), 694 cm –1 (Al–O bond in tetrahedral AlO 4 in γ-Al 2 O 3 ), 1331 cm –1 (D band of graphene), and 1578 cm –1 (G band of the graphene in-plane vibration mode of sp 2 carbon).…”