GB783670A - Improvements in or relating to methods of making single crystals of ferrite - Google Patents
Improvements in or relating to methods of making single crystals of ferriteInfo
- Publication number
- GB783670A GB783670A GB35432/55A GB3543255A GB783670A GB 783670 A GB783670 A GB 783670A GB 35432/55 A GB35432/55 A GB 35432/55A GB 3543255 A GB3543255 A GB 3543255A GB 783670 A GB783670 A GB 783670A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystal
- lead monoxide
- ferrite
- pict
- nickel ferrite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
- C30B29/22—Complex oxides
- C30B29/26—Complex oxides with formula BMe2O4, wherein B is Mg, Ni, Co, Al, Zn, or Cd and Me is Fe, Ga, Sc, Cr, Co, or Al
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
<PICT:0783670/III/1> <PICT:0783670/III/2> <PICT:0783670/III/3> <PICT:0783670/III/4> Ferrites, containing in addition to iron one or more other metals are formed by crystallizing the ferrite from a solution thereof in lead monoxide by gradually reducing the temperature at a rate less than 30 DEG C. per hour. According to an example a nickel ferrite was made by adding to lead monoxide powder a mixture of nickel and ferric oxides in stoichiometric proportions and heating the mixture in a platinum crucible to 1300 DEG C. for one hour. The temperature was then lowered at about 10 DEG C. per hour and when the nickel ferrite became supersaturated in the lead monoxide solution small crystals of nickel ferrite were formed of a somewhat irregular structure as shown in Fig. 1. The crystals so obtained were then employed as seed crystals in a lead monoxide melt maintained at 1300 DEG C. and containing 30 per cent by weight of nickel ferrite whereby a crystal as shown in Fig. 2 was obtained, where 12 indicates the new growth. The upper portion of the crystal of Fig. 2 may be employed in a further crystallization whereby a uniform crystal as shown in Fig. 3 may be obtained. Crystallization may suitably be effected in a platinum crucible as shown in Fig. 5 where a lid 16 supports a wire 18 to the end of which a seed crystal 20 is attached. The lid with the attached crystal is lowered into the saturated solution of nickel ferrite in lead monoxide, 17. The temperature is then reduced and the resulting nickel ferrite crystal may be withdrawn by removing the lid or alternatively the lead monoxide melt may be poured away before it solidifies or the ferrite crystal may be allowed to cool in the solidified lead monoxide, the latter then being dissolved with a solution of nitric acid. The outer surface of the crystals tends to be strained and is suitably removed by machining or etching. Other ferrites which may be similarly obtained are those of cobalt, zinc magnesium and cadmium, manganese and copper, all of which have a spinel structure, and also ferrites of calcium, strontium and barium which have a hexagonal crystal structure. Complex ferrites such as Ni5Zn5Fe2O4 may also be prepared.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US783670XA | 1954-12-14 | 1954-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB783670A true GB783670A (en) | 1957-09-25 |
Family
ID=22143597
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB35432/55A Expired GB783670A (en) | 1954-12-14 | 1955-12-09 | Improvements in or relating to methods of making single crystals of ferrite |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB783670A (en) |
-
1955
- 1955-12-09 GB GB35432/55A patent/GB783670A/en not_active Expired
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