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Phase Diagram Investigations in the System Ba–Cu–O–Cl and Magnetic Properties of Ba3Cu2O4Cl2and Ba2Cu3O4Cl2

✍ Scribed by K. Ruck; D. Eckert; G. Krabbes; M. Wolf; K.-H. Müller

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
538 KB
Volume
141
Category
Article
ISSN
0022-4596

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✦ Synopsis

The polythermal section at a constant composition of 20 mol% BaCl 2 of the quasi-ternary system BaCl 2 -BaO-CuO x was investigated at p(O 2 ) ‫؍‬ 0.21 bar by means of DTA/TG and soaking experiments. Our results show the nature of incongruent decomposition reactions of the quaternary phases Ba 3 Cu 2 O 4 Cl 2 and Ba 2 Cu 3 O 4 Cl 2 at T ‫؍‬ 925°°C (؎5°°) and T ‫؍‬ 975°°C (؎5°°), respectively. Single crystals of both compounds were grown. Furthermore, field-dependent magnetic properties of Ba 3 Cu 2 O 4 Cl 2 and Ba 2 Cu 3 O 4 Cl 2 are measured at various temperatures. Both compounds contain two crystallographically different types of magnetic Cu atoms. Ba 3 Cu 2 O 4 Cl 2 exhibits antiferromagnetic order with a Nee´l temperature T N of about 20 K. A spin-flop transition is observed below T N at a field of 2.6 T. Ba 2 Cu 3 O 4 Cl 2 shows two antiferromagnetic transition temperatures at T NI + 337 K and T NII +33 K. Below T NI some spontaneous magnetization is observed.

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✍ H Effenberger 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 432 KB

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