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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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Real (χ′ versus T) and imaginary (χ″ versus T) parts of the ac susceptibility curves of BiCr1−xGaxO3 (R3c) with x = (a) 0.4, (b) 0.5, (c) 0.7 and (d) 0.6.
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Figure 9: Real (χ′ versus T) and imaginary (χ″ versus T) parts of the ac susceptibility curves of BiCr1−xGaxO3 (R3c) with x = (a) 0.4, (b) 0.5, (c) 0.7 and (d) 0.6.

Mentions: The χ versus T curves of BiCr1−xGaxO3 with x = 0.4, 0.5, 0.6 and 0.7 having the R3c polar symmetry are shown on figure 7, and the parameters of the Curie–Weiss fits are summarized in table 1 (the fits are given in figure S9 of the ESI). Effective magnetic moments per a Cr3+ ion are close to the expected value for those samples. The temperature of magnetic transitions in BiCr1−xGaxO3 monotonically decreases with increasing x indicating that the magnetic transitions are intrinsic. The ZFC and FC curves of BiCr0.6Ga0.4O3 are typical for canted antiferromagnets; in particular, the FC curves demonstrate the saturation behaviour. In addition, BiCr0.6Ga0.4O3 shows a weak specific heat anomaly at 55 K (figure 8). These features indicate that there is a long-range magnetic ordering in BiCr0.6Ga0.4O3. The χ′ versus T and χ″ versus T curves of BiCr0.6Ga0.4O3 (figure 9(a)) show sharp and frequency-independent peaks at TN with additional very broad anomalies near 22 K (on the χ″ versus T curves).


Magnetic properties of solid solutions between BiCrO 3 and BiGaO 3 with perovskite structures
Real (χ′ versus T) and imaginary (χ″ versus T) parts of the ac susceptibility curves of BiCr1−xGaxO3 (R3c) with x = (a) 0.4, (b) 0.5, (c) 0.7 and (d) 0.6.
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Related In: Results  -  Collection

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Figure 9: Real (χ′ versus T) and imaginary (χ″ versus T) parts of the ac susceptibility curves of BiCr1−xGaxO3 (R3c) with x = (a) 0.4, (b) 0.5, (c) 0.7 and (d) 0.6.
Mentions: The χ versus T curves of BiCr1−xGaxO3 with x = 0.4, 0.5, 0.6 and 0.7 having the R3c polar symmetry are shown on figure 7, and the parameters of the Curie–Weiss fits are summarized in table 1 (the fits are given in figure S9 of the ESI). Effective magnetic moments per a Cr3+ ion are close to the expected value for those samples. The temperature of magnetic transitions in BiCr1−xGaxO3 monotonically decreases with increasing x indicating that the magnetic transitions are intrinsic. The ZFC and FC curves of BiCr0.6Ga0.4O3 are typical for canted antiferromagnets; in particular, the FC curves demonstrate the saturation behaviour. In addition, BiCr0.6Ga0.4O3 shows a weak specific heat anomaly at 55 K (figure 8). These features indicate that there is a long-range magnetic ordering in BiCr0.6Ga0.4O3. The χ′ versus T and χ″ versus T curves of BiCr0.6Ga0.4O3 (figure 9(a)) show sharp and frequency-independent peaks at TN with additional very broad anomalies near 22 K (on the χ″ versus T curves).

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.