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Magnetic properties of solid solutions between BiCrO 3 and BiGaO 3 with perovskite structures

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ABSTRACT

Magnetic properties of BiCr1−xGaxO3 perovskite-type solid solutions are reported, and a magnetic phase diagram is established. As-synthesized BiCrO3 and BiCr0.9Ga0.1O3 crystallize in a monoclinic (m) C2/c structure. The Néel temperature (TN) decreases from 111 K in BiCrO3 to 98 K in BiCr0.9Ga0.1O3, and spin-reorientation transition temperature increases from 72 K in BiCrO3 to 83 K in BiCr0.9Ga0.1O3. o-BiCr0.9Ga0.1O3 with a PbZrO3-type orthorhombic structure is obtained by heating m-BiCr0.9Ga0.1O3 up to 573 K in air; it shows similar magnetic properties with those of m-BiCr0.9Ga0.1O3. TN of BiCr0.8Ga0.2O3 is 81 K, and TN of BiCr0.7Ga0.3O3 is 63 K. Samples with x = 0.4, 0.5, 0.6 and 0.7 crystallize in a polar R3c structure. Long-range antiferromagnetic order with weak ferromagnetism is observed below TN = 56 K in BiCr0.6Ga0.4O3, TN = 36 K in BiCr0.5Ga0.5O3 and TN = 18 K in BiCr0.4Ga0.6O3. BiCr0.3Ga0.7O3 shows a paramagnetic behaviour because the Cr concentration is below the percolation threshold of 31%.

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Isothermal magnetization curves of (a) BiCr0.6Ga0.4O3 (R3c) at 5, 30 and 70 K, (b) BiCr0.5Ga0.5O3 (R3c) at 5, 30 and 70 K, (c) BiCr0.4Ga0.6O3 (R3c) at 5 and 30 K and (d) BiCr0.3Ga0.7O3 (R3c) at 5 and 30 K.
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Figure 10: Isothermal magnetization curves of (a) BiCr0.6Ga0.4O3 (R3c) at 5, 30 and 70 K, (b) BiCr0.5Ga0.5O3 (R3c) at 5, 30 and 70 K, (c) BiCr0.4Ga0.6O3 (R3c) at 5 and 30 K and (d) BiCr0.3Ga0.7O3 (R3c) at 5 and 30 K.

Mentions: Isothermal magnetization curves of BiCr1−xGaxO3 with x = 0.4, 0.5, 0.6 and 0.7 are given in figure 10. They show that a weak ferromagnetic moment is developed below TN in BiCr1−xGaxO3 with x = 0.4, 0.5 and 0.6. In BiCr0.6Ga0.4O3, the magnetization reaches 0.17μB/Cr at 5 K and 50 kOe; at 5 K, the remnant magnetization is 0.023μB/Cr, and the coercitive field is about 180 Oe (figure S11 of the ESI).


Magnetic properties of solid solutions between BiCrO 3 and BiGaO 3 with perovskite structures
Isothermal magnetization curves of (a) BiCr0.6Ga0.4O3 (R3c) at 5, 30 and 70 K, (b) BiCr0.5Ga0.5O3 (R3c) at 5, 30 and 70 K, (c) BiCr0.4Ga0.6O3 (R3c) at 5 and 30 K and (d) BiCr0.3Ga0.7O3 (R3c) at 5 and 30 K.
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Figure 10: Isothermal magnetization curves of (a) BiCr0.6Ga0.4O3 (R3c) at 5, 30 and 70 K, (b) BiCr0.5Ga0.5O3 (R3c) at 5, 30 and 70 K, (c) BiCr0.4Ga0.6O3 (R3c) at 5 and 30 K and (d) BiCr0.3Ga0.7O3 (R3c) at 5 and 30 K.
Mentions: Isothermal magnetization curves of BiCr1−xGaxO3 with x = 0.4, 0.5, 0.6 and 0.7 are given in figure 10. They show that a weak ferromagnetic moment is developed below TN in BiCr1−xGaxO3 with x = 0.4, 0.5 and 0.6. In BiCr0.6Ga0.4O3, the magnetization reaches 0.17μB/Cr at 5 K and 50 kOe; at 5 K, the remnant magnetization is 0.023μB/Cr, and the coercitive field is about 180 Oe (figure S11 of the ESI).

View Article: PubMed Central - PubMed

ABSTRACT

Magnetic properties of BiCr1−xGaxO3 perovskite-type solid solutions are reported, and a magnetic phase diagram is established. As-synthesized BiCrO3 and BiCr0.9Ga0.1O3 crystallize in a monoclinic (m) C2/c structure. The Néel temperature (TN) decreases from 111 K in BiCrO3 to 98 K in BiCr0.9Ga0.1O3, and spin-reorientation transition temperature increases from 72 K in BiCrO3 to 83 K in BiCr0.9Ga0.1O3. o-BiCr0.9Ga0.1O3 with a PbZrO3-type orthorhombic structure is obtained by heating m-BiCr0.9Ga0.1O3 up to 573 K in air; it shows similar magnetic properties with those of m-BiCr0.9Ga0.1O3. TN of BiCr0.8Ga0.2O3 is 81 K, and TN of BiCr0.7Ga0.3O3 is 63 K. Samples with x = 0.4, 0.5, 0.6 and 0.7 crystallize in a polar R3c structure. Long-range antiferromagnetic order with weak ferromagnetism is observed below TN = 56 K in BiCr0.6Ga0.4O3, TN = 36 K in BiCr0.5Ga0.5O3 and TN = 18 K in BiCr0.4Ga0.6O3. BiCr0.3Ga0.7O3 shows a paramagnetic behaviour because the Cr concentration is below the percolation threshold of 31%.

No MeSH data available.