Susceptibility of an amorphous antiferromagnet

Kobe, S.; Handrich, K.

doi:10.1002/pssb.19700420163

Cited by 28 publications

(3 citation statements)

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“…The Cr3+ ions are coupled in an antiferromagnetic order, showing a negative-exchange interaction. Theoretical calculations as carried out by Simpson (1970), Kobe and Handrich (1970), and Hasegawa (1971) have shown that this is possible for the amorphous systems.…”

Section: Resultsmentioning

confidence: 98%

Controlled crystallization of lead oxide-chromium oxide-boron oxide (PbO-Cr2O3-B2O3) glasses and a catalytic effect of alumina for the growth of lead chromate (Pb2CrO5) microcrystals

Ram¹,

Narayan²

1987

Ind. Eng. Chem. Res.

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The crystallization properties of Pb0-Cr203-B203 glasses have been studied by using X-ray diffraction, microstructure, and infrared spectroscopy. Microcrystals due to lead chromates, PbCr04 and Pb2Cr05, usually precipitated out in the glasses that were given heat treatments between 400 and 1200 °C. Incorporation of A1203 (up to ~5 mol %) in the glass exhibits the mechanically stronger and fine-grained ceramics with Pb2Cr05 as the main crystalline phase. The A1203 (a glass network modifier) induces the B04 structural groups to grow at the expense of B03 groups in the glass network. This favors the precipitation of the PbOPbCr04 phase. A maximum of ~80 vol % crystallization fraction has been obtained for this phase in the glass composition system 50PbO-20Cr2O3-25B203-5A1203 (mol %) when heat treated at ~850 °C for 25 h.The controlled crystallization of glasses is now commonly employed to produce glass ceramics with superior mechanical, thermal, abrasion-resistant, and energy-transfer properties (McMillan, 1979). The ceramics with different lead chromate phases can be developed in Pb0-Cr203-B203 glasses when the latter are subjected to heat treatments. These materials are especially useful for fiber optics, laser hosts, acoustooptical devices, magnetooptic switches, and lead acid battery electrodes (

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Section: Resultsmentioning

confidence: 98%

Controlled crystallization of lead oxide-chromium oxide-boron oxide (PbO-Cr2O3-B2O3) glasses and a catalytic effect of alumina for the growth of lead chromate (Pb2CrO5) microcrystals

Ram¹,

Narayan²

1987

Ind. Eng. Chem. Res.

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“…F r o m equation (10) follows for t h e spin i in the ground state. F o r the crystalline case this expressior, reduces to that of F i s h e r (14), which is known to yield r a t h e r good r e s u l t s (15).…”

Section: K95mentioning

confidence: 99%

“…Theoretically the susceptibility was calculated within the molecular field approximation (9,10). Further in (11) it was shown that the well-known equality of the specific heat, free and internal energies, the absolute value of the (sublattice) magnetizations and the critical temperatures (T = T ) for the ferromagnet and C N the corresponding antiferromagnet (I.…”

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confidence: 99%

Comment on the Ground State of Amorphous Antiferromagnets

Handrich

1973

Physica Status Solidi (b)

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Antiierromagnetic behaviour was found recently in several borate and phosphate glasses containing manganese, iron, o r vanadium (1 to 6) and in an amorphous Mn-P-C alloy (7) (see also the review (8)). Mainly the magnetic susceptibility and the Nee1 temperature were determined. In (6) the first measurements of the specific heat and of neutron diffraction on amorphous antiferromagnets were given.Theoretically the susceptibility was calculated within the molecular field approximation (9, 10). Further in (11) antiferrornagnets (see also the remark in (7)). In the case of disordered alloys consisting of magnetic and nonmagnetic atoms a decrease of the sublattice magnetization due to the vanishing exchange integrals is obvious (see e.g. (13)). But it is not c l e whether or not the fluctuations of the nonvanishing exchange integrals influence these quantities.7 phvsica (b)

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Magnetic susceptibility studies of iron-dysprosium sodium borate glasses

Catchings

1977

Phys. Stat. Sol. (a)

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Susceptibility of an amorphous antiferromagnet

Abstract: Recently, an effective field model of an amorphous antiferromagnet was discussed by Simpson (1). We have investigated the same system by a "computer experiment" (2) sol\iing the equation

Cited by 28 publications

References 2 publications

Controlled crystallization of lead oxide-chromium oxide-boron oxide (PbO-Cr2O3-B2O3) glasses and a catalytic effect of alumina for the growth of lead chromate (Pb2CrO5) microcrystals

Controlled crystallization of lead oxide-chromium oxide-boron oxide (PbO-Cr2O3-B2O3) glasses and a catalytic effect of alumina for the growth of lead chromate (Pb2CrO5) microcrystals

Comment on the Ground State of Amorphous Antiferromagnets

Magnetic susceptibility studies of iron-dysprosium sodium borate glasses

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