THE SEPARATION OF RARE EARTHS WITH THE USE OF ETHYLENEDIAMINE-TETRAACETIC ACID. V. DIAGRA OF SOLUBILITY NH*SUB 4/(La-EDTA)-NH*SUB 4/(Sm-EDTA)-H*SUB 2/O AND K(La-EDTA)-K(Sm-EDTA)-H*SUB 2/O AT 0 C (in French)
In the system NH/sub 4/STASm-EDTA! --NH/sub 4/STASm-EDTA! -- H/sub 2/O (EDTA = ethylenediaminetetraacetate), two solid phases appear at 0 deg ; the samarium-rich mixed crystals NH/sub 4/STASm, La)-EDTA!,8H/sub 2/O (= phase alpha ) aad the lanthanumrich phase BETA (= NH/sub 4/STA(La,Sm)-EDTA!, a H/sub 2/O; n = probably 3). The solubility diagram shows two saturation curves; an important miscibility gap exists between the two phases. The system belongs to the type IV of the Roozeboom classification. Only one solid phase has been encountered in the system KSTALa-EDTA! -- KSTASm-EDTA! -- H/sub 2/O. It consists of the mixed crystals KSTA(La,Sm)-EDTA!, 8H/sub 2/O with complete miscibility between La and Sm. As may be seen in the distribution diagram, a congruently saturated solution will probably exist at O deg C (with approx. 95 at.-g% Sm). Therefore this system should belong to Roozeboom's type III. (auth) A study has been made of the absolute magnetization of some rare earth metals (gadolinium and cerium) and some compounds (ytterbium oxide, neodymium oxide, erbium oxide and yttrium iron garnet) as a function of magnetic fields up to 60,000 gauss and temperature down to 1.3 deg K. The saturation magnetization of ferromagnetic gadolinium is 7.05 plus or minus 0.10 Bohr magneton per atom of gadolinium and its molecular field is 1.3 megagauss. The average magnetization of cerium is only 0.17 Bohr magneton per atom of cerium even at 1.3 deg K and 60,000 gauss. it is ferrimagnetic with an estimated antiferromagnetic molecular field of one-half megagauss. Ytterbium sesquioxide has an antiferromagnetic molecular field of about 35,000 gauss and becomes antiferromagnetic at about 3 deg K in zero field. Yttrium iron garnet (YIG) has been studied and the saturation magnetization has been determined at 100 deg K and in the helium range. The saturation magnetization is 0.83 at 1.3 deg K as compared with 1.25 Bohr magnetons per atom of iron in gamma iron(III) oxide studied previously. A ballistic method was used for measuring the magnetic moment and the calibration was made using metallic iron. (auth)
- Research Organization:
- Originating Research Org. not identified
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-12-007734
- OSTI ID:
- 4326779
- Journal Information:
- Helvetica Chimica Acta (Switzerland), Vol. Vol: 41; Other Information: Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- Country unknown/Code not available
- Language:
- French
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