JPH01188458A - Production of superconducting ceramic - Google Patents
Production of superconducting ceramicInfo
- Publication number
- JPH01188458A JPH01188458A JP63012674A JP1267488A JPH01188458A JP H01188458 A JPH01188458 A JP H01188458A JP 63012674 A JP63012674 A JP 63012674A JP 1267488 A JP1267488 A JP 1267488A JP H01188458 A JPH01188458 A JP H01188458A
- Authority
- JP
- Japan
- Prior art keywords
- calcined
- rare earth
- earth element
- general formula
- product
- 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.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims abstract description 18
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 229910052692 Dysprosium Inorganic materials 0.000 claims abstract description 3
- 229910052689 Holmium Inorganic materials 0.000 claims abstract description 3
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 3
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract 2
- 229910052772 Samarium Inorganic materials 0.000 claims abstract 2
- 229910052769 Ytterbium Inorganic materials 0.000 claims abstract 2
- 229910052727 yttrium Inorganic materials 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 2
- 229910052765 Lutetium Inorganic materials 0.000 claims 1
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 17
- 239000000203 mixture Substances 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract description 5
- 239000011230 binding agent Substances 0.000 abstract description 4
- 238000001354 calcination Methods 0.000 abstract description 4
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000007858 starting material Substances 0.000 abstract 2
- 229910052691 Erbium Inorganic materials 0.000 abstract 1
- 229910052693 Europium Inorganic materials 0.000 abstract 1
- 229910052775 Thulium Inorganic materials 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- -1 etc. Chemical compound 0.000 abstract 1
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、液体窒素温度（７７Ｋ）でも超電導特性が得
られる一般式ＲＢａｚＣｕ３０７−で表されＲが希土類
元素系の超電導セラミックスの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing superconducting ceramics represented by the general formula RBazCu307-, in which R is a rare earth element, and which exhibits superconducting properties even at liquid nitrogen temperatures (77 K).
従来、絶対温度２０にで超電導特性が得られる超電導物
質としては、Ｎｂ５Ｓｎ系、ＮｂｚＧｅ系、ＮｂＴｉ系
等の金属系超電導物質が知られている。このような金属
系超電導物質に対して、はるかに高い絶対温度９０に近
くの温度で超電導効果を得ることが可能な一般式ＲＢａ
ｚＣｕｘＯｔ−８で表され、Ｒが希土類元素系の超電導
セラミックスが最近知られるようになり、実用化に向け
て各方面で検討が進められている。Conventionally, metal-based superconducting materials such as Nb5Sn-based, NbzGe-based, and NbTi-based superconducting materials are known as superconducting materials that can obtain superconducting properties at an absolute temperature of 20 degrees. For such metallic superconducting materials, the general formula RBa is able to obtain superconducting effects at temperatures close to the much higher absolute temperature of 90.
Superconducting ceramics, represented by zCuxOt-8, in which R is a rare earth element, have recently become known, and studies are underway in various fields for practical use.
この−ＩＱ式ＲＢａｚＣｕ３０．□系超電導セラミック
スの一般的な製造方法は、その原料粉末を所定の比率で
配合し、この配合物をボールミル等の混合手段で混合す
る。この得られた混合粉末を大気中で仮焼してから１０
０μｍ以下に粉砕し、この仮焼粉末に有機質バインダー
を加えて混合し、所定の形状に成型する。この成形物を
酸素雰囲気中で焼成して焼結体とし、さらに必要に応じ
て酸素雰囲気中で熱処理してアニールを行うものである
。This -IQ formula RBazCu30. A general method for manufacturing □-based superconducting ceramics is to blend raw material powders in a predetermined ratio and mix this blend using a mixing means such as a ball mill. After calcining the obtained mixed powder in the air,
The powder is pulverized to 0 μm or less, an organic binder is added to the calcined powder, mixed, and molded into a predetermined shape. This molded product is fired in an oxygen atmosphere to form a sintered body, and if necessary, heat-treated in an oxygen atmosphere to perform annealing.
上記の従来の製造方法で得られた上記一般式ＲＢａｚＣ
ｕｚＯｔ−ｘ系の超電導セラミックス体には、その内部
組織に一般式ＲｚＢａＣｕＯｓ （Ｒは希土類元素）の
組成の半導体物質が部分的に析出し、この半導体物質が
多いほどこの超電導セラミックス体の臨界電流密度 Ｊ
ｃ （Ａ／ｃｏりが低下することがわがってきた。The above general formula RBazC obtained by the above conventional manufacturing method
In the uzOt-x system superconducting ceramic body, a semiconductor substance having the general formula RzBaCuOs (R is a rare earth element) is partially precipitated in its internal structure, and the more this semiconductor substance is present, the higher the critical current density of the superconducting ceramic body is. J
c (It has been found that the A/co ratio decreases.
本発明の目的は、臨界電流密度 Ｊｃ （Ａ／ｃａｌ）
を低下させないことを可能にした一般式ＲＢａｚＣｕ＋
０ｔ−ｘ（Ｒは希土類元素）系の超電導セラミックス体
の製造方法を提供することにある。The purpose of the present invention is to obtain critical current density Jc (A/cal)
The general formula RBazCu+ made it possible not to reduce
An object of the present invention is to provide a method for manufacturing a superconducting ceramic body based on 0t-x (R is a rare earth element).
上記目的を達成するために、本発明は、一般弐ＲＢａｚ
ＣｕｉＯ１−ｘ（但し、ＲはＹ 、、 Ｎｄｓ ５ｌｌ
１％ Ｂｕｓ Ｇｄ５Ｄｙ、 ８０％ ＥｒＳＴｍ５
Ｙｂｓ Ｌｕを表す）系超電導セラミックスの原料粉末
を所定の比率に混合した混合粉末を大気中で仮焼する工
程と、この仮焼材料を１〜１０重量％の硝酸水溶液中に
１〜３０分間浸漬した後取り出す工程と、この浸漬処理
した材料を成型してから酸素雰囲気中で焼成する工程を
有することを特徴とする超電導セラミックスの製造方法
を提供するものである。In order to achieve the above object, the present invention
CuiO1-x (where R is Y,, Nds 5ll
1% Bus Gd5Dy, 80% ErSTm5
Ybs Lu) system superconducting ceramics raw material powder mixed at a predetermined ratio and calcined in the air, and this calcined material is immersed in a 1-10% by weight nitric acid aqueous solution for 1-30 minutes. The present invention provides a method for producing superconducting ceramics, which comprises a step of taking out the immersion-treated material, and a step of molding the immersed material and then firing it in an oxygen atmosphere.
次に本発明の詳細な説明する。Next, the present invention will be explained in detail.
本発明においては、一般弐ＲＢａ２ＣｕｓＯ７−ｘであ
って、ＲがＹ ％ Ｎｄ、、５ＩＩ１％ Ｅｕ５Ｇｄｓ
Ｄｙ、、 Ｈｏ、 Ｅｒｓ Ｔｍ。In the present invention, general 2RBa2CusO7-x, R is Y%Nd, 5II1%Eu5Gds
Dy, Ho, Ers Tm.
Ｙｂｓ Ｌｕで示される希土類元素系超電導セラミック
ス体が対象になるが、その原料粉末としては一般式Ｒ，
０３（Ｒは上記希土類元素）の希土類元素酸化物、Ｂａ
Ｃ０１、ＣｕＯ等が用いられ、これらは例えばＲ：Ｂａ
：Ｃｕ ＝ １ ：２：３になるように配合される。こ
れらの原料粉末の粒径としては０．１〜５μｍが好まし
い。The target is a rare earth element-based superconducting ceramic body represented by Ybs Lu, and its raw material powder has the general formula R,
Rare earth element oxide of 03 (R is the above rare earth element), Ba
C01, CuO, etc. are used, and these are, for example, R:Ba
:Cu=1:2:3. The particle size of these raw material powders is preferably 0.1 to 5 μm.
この配合物はボールミル等の混合手段により１〜２４時
間混合されてから大気中で仮焼される。この仮焼の温度
は８８０〜９６０℃、６〜２４時間が例示される。この
ようにして得られた仮焼材料は、再度ボールミル等の粉
砕手段で１００μｍ以下の粒径になるまで粉砕される。This mixture is mixed for 1 to 24 hours using a mixing means such as a ball mill, and then calcined in the atmosphere. The temperature of this calcining is exemplified at 880 to 960°C for 6 to 24 hours. The calcined material thus obtained is crushed again using a crushing means such as a ball mill until it has a particle size of 100 μm or less.
このようにして得られた仮焼粉末は、１〜１０重量％の
水溶液に１〜３０分浸漬される。これが１重量％未満で
あると、一般式ＲｚＢａＣｕＯｓ （Ｒは上記希土類元
素）の化合物の溶出のために長時間要するため、水溶液
中のＯＨ機の影響を受けて一般式ＲＢａｚＣｕ３０マー
ｘ （Ｒは上記希土類元素）化合物が分解される。また
、硝酸含有量が１０重量％を越えると、一般式ＲＢａｚ
ＣｔｌｚＯｔ−ｘ（Ｒは上記希土類元素）化合物そのも
のが分解されてしまうため好ましくない。The calcined powder thus obtained is immersed in a 1-10% by weight aqueous solution for 1-30 minutes. If this is less than 1% by weight, it will take a long time to elute the compound of the general formula RzBaCuOs (R is the above rare earth element), and the general formula RBazCu30merx (R is the above mentioned rare earth element) will be affected by the OH machine in the aqueous solution. Rare earth elements) compounds are decomposed. In addition, when the nitric acid content exceeds 10% by weight, the general formula RBaz
This is not preferable because the CtlzOt-x (R is the above-mentioned rare earth element) compound itself is decomposed.
このような処理を施された仮焼材料は、乾燥後有機質バ
インダーが加えられ、所定の形状に成形されるが、この
際１００〜１０００ Ｋｇ／ａ＋Ｉの圧力で加圧成形す
ることが好ましい。この有機質バインダーとしてはアク
リル系等の樹脂をエタノール等の溶剤に溶解したものが
挙げられる。After drying, the calcined material subjected to such treatment is added with an organic binder and molded into a predetermined shape. At this time, pressure molding is preferably performed at a pressure of 100 to 1000 Kg/a+I. Examples of the organic binder include those obtained by dissolving acrylic resin or the like in a solvent such as ethanol.
このようにして得られた成形体は、酸素雰囲気中で９０
０〜９８０℃、３〜１２時間焼成される。The molded body thus obtained was heated to 90% in an oxygen atmosphere.
It is baked at 0 to 980°C for 3 to 12 hours.
一般式ＲＢａｚＣｕｓＯｙ−’ｘ（Ｒは上記希土類元素
）系超電導セラミックスの原料粉末を仮焼した後、硝酸
水溶液に浸漬処理すると、一般式ＲｚＢａＣｕＯ２（Ｒ
は上記希土類元素）の半導体化合物が硝酸水溶液に溶は
出し、この半導体化合物を仮焼材料から減らすことがで
き、したがって一般式ＲＢａｚＣｕｚ０７−ｘ（Ｒは上
記希土類元素）系超電導セラミックス焼結体にこれらの
半導体成分を少なくできると考えられるが詳細は明らか
でない。After calcining the raw material powder of superconducting ceramics based on the general formula RBazCusOy-'x (R is the above-mentioned rare earth element), when it is immersed in a nitric acid aqueous solution, the general formula RzBaCuO2 (R
Semiconductor compounds of the above-mentioned rare earth elements) are dissolved in the nitric acid aqueous solution, and this semiconductor compound can be reduced from the calcined material. It is thought that the amount of semiconductor components can be reduced, but the details are not clear.
実施例
実施例１
原料粉末としてＹ２Ｏ３、ＢａＣ０３％ ＣｕＯをそれ
ぞれＹ：Ｂａ：Ｃｕの比が１：２：３になるように配合
し、ボールミルで１５時間混合した。Examples Example 1 Y2O3 and BaC03% CuO were blended as raw material powders so that the ratio of Y:Ba:Cu was 1:2:3, and mixed in a ball mill for 15 hours.
得られた混合粉末を大気中９２０℃で１６時間仮焼した
後常温に冷却した後、再びボールミルに仕込み、１００
μｍ以下になるまで粉砕した。The obtained mixed powder was calcined in the air at 920°C for 16 hours, cooled to room temperature, and then charged into a ball mill again.
It was ground to a particle size of μm or less.
得られた仮焼粉末を純水を用いて調製した硝酸１重量％
水溶液中に１分間浸漬した後、１５μｍのメンブランフ
ィルタ−で濾過して前記水溶液と分離し、乾燥させた。1% by weight of nitric acid prepared from the obtained calcined powder using pure water.
After being immersed in the aqueous solution for 1 minute, it was filtered through a 15 μm membrane filter to separate it from the aqueous solution and dried.
次いで得られた粉末を２００ Ｋｇ／ ｅｒａの圧力で
加圧成形した。The resulting powder was then pressure molded at a pressure of 200 Kg/era.
この成形物を酸素雰囲気中９００℃で５時間焼成し、焼
成体を作製した。This molded product was fired at 900° C. for 5 hours in an oxygen atmosphere to produce a fired body.
この得られた焼成体をクライオスタンド中で常温から液
体窒素温度まで徐々に冷却し、抵抗値が０になる臨界温
度Ｔｃ及び臨界電流密度Ｊｃ （Ａ／ｃｊ）を測定した
結果を表に示す。The obtained fired body was gradually cooled in a cryostand from room temperature to liquid nitrogen temperature, and the critical temperature Tc and critical current density Jc (A/cj) at which the resistance value becomes 0 were measured, and the results are shown in the table.
実施例２
実施例１において、硝酸水溶液の濃度を５％にした以外
は同様にして焼成体を作製し、実施例１と同様に測定し
た結果を表に示す。Example 2 A fired body was prepared in the same manner as in Example 1 except that the concentration of the nitric acid aqueous solution was changed to 5%, and the results of measurements in the same manner as in Example 1 are shown in the table.
実施例３
実施例１において、硝酸水溶液の濃度を１％にした以外
は同様にして焼成体を作製し、実施例１と同様に測定し
た結果を表に示す。Example 3 A fired body was produced in the same manner as in Example 1 except that the concentration of the nitric acid aqueous solution was changed to 1%, and the results of measurements in the same manner as in Example 1 are shown in the table.
実施例４
実施例１において、硝酸水溶液に対する浸漬時間を３０
分にした以外は同様にして焼成体を作製し、実施例１と
同様に測定した結果を表に示す。Example 4 In Example 1, the immersion time in the nitric acid aqueous solution was 30
A fired body was produced in the same manner as in Example 1, except that the temperature was changed to 100%.The results are shown in the table.
比較例１
実施例１において、仮焼粉末を硝酸水溶液に浸漬する処
理を行わなかった以外は同様にして焼成体を作製し、実
施例１と同様に測定した結果を表に示す。Comparative Example 1 A calcined body was produced in the same manner as in Example 1 except that the treatment of immersing the calcined powder in an aqueous nitric acid solution was not performed, and the results were measured in the same manner as in Example 1, and the results are shown in the table.
比較例２
実施例１において、硝酸水溶液に浸漬処理する代わりに
純水に仮焼粉末を１時間浸漬処理した以外は同様にして
焼成体を作製し、実施例１と同様に測定した結果を表に
示す。Comparative Example 2 A fired body was produced in the same manner as in Example 1 except that the calcined powder was immersed in pure water for 1 hour instead of being immersed in a nitric acid aqueous solution, and the results were measured in the same manner as in Example 1. Shown below.
上記実施例及び比較例の結果から明らかの如〈実施例で
得られた焼成体の臨界電流密度Ｊｃ （Ａ／Ｃ４）はい
ずれも、４０ （Ａ／ｃｄ）以上であるのに対し、比較
例のＪｃは２０ （Ａ／ｃｄ）であり、比較例のものに
はＪｃの低下が認められる。As is clear from the results of the above Examples and Comparative Examples, the critical current density Jc (A/C4) of the fired bodies obtained in the Examples is 40 (A/cd) or more, whereas the Jc was 20 (A/cd), and a decrease in Jc was observed in the comparative example.
本発明によれば、一般式ＲＢａｚＣｔｌｓＯｔ−ｘ（Ｒ
は上記希土類元素）系超電導セラミックスの原料粉末の
仮焼材料を硝酸処理したので、一般式ＲＪａＣｕＯｓ（
Ｒは上記希土類元素）の半４体化合物が選択的に溶解さ
れてその含有量が少なくなり、その結果一般式ＲＢａア
ＣｕｚＯｔ−＊（Ｒは上記希土類元素）系超電導セラミ
ックスに含まれるこの半導体量も少なくなったと考えら
れ、その電流密度Ｊｃを大きく保つことができる。According to the invention, the general formula RBazCtlsOt-x(R
Since the calcined material of the raw material powder of the above-mentioned rare earth element)-based superconducting ceramics was treated with nitric acid, the general formula RJaCuOs (
R is the above-mentioned rare earth element) semi-tetratramic compound is selectively dissolved and its content is reduced, and as a result, the amount of this semiconductor contained in the general formula RBa-CuzOt-* (R is the above-mentioned rare earth element) based superconducting ceramics. It is considered that the current density Jc has decreased, and the current density Jc can be kept high.
昭和６３年０１月２５日January 25, 1985
Claims (1)
、ＲはＹ、Ｎｄ、Ｓｍ、ＥＵ、Ｇｄ、Ｄｙ、Ｈｏ、Ｅｒ
、Ｔｍ、Ｙｂ、Ｌｕを表す）系超電導セラミックスの原
料粉末を所定の比率に混合した混合粉末を大気中で仮焼
する工程と、この仮焼材料を１〜１０重量％の硝酸水溶
液中に１〜３０分間浸漬した後取り出す工程と、この浸
漬処理した材料を成型してから酸素雰囲気中で焼成する
工程を有することを特徴とする超電導セラミックスの製
造方法。(1) General formula RBa_2Cu_3O_7_-_x (where R is Y, Nd, Sm, EU, Gd, Dy, Ho, Er
, Tm, Yb, Lu) system superconducting ceramic raw material powder mixed in a predetermined ratio is calcined in the air, and this calcined material is dissolved in a 1 to 10 wt% nitric acid aqueous solution. A method for producing superconducting ceramics, comprising a step of immersing the material for ~30 minutes and then taking it out, and a step of molding the immersed material and then firing it in an oxygen atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63012674A JPH01188458A (en) | 1988-01-25 | 1988-01-25 | Production of superconducting ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63012674A JPH01188458A (en) | 1988-01-25 | 1988-01-25 | Production of superconducting ceramic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01188458A true JPH01188458A (en) | 1989-07-27 |
Family
ID=11811921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63012674A Pending JPH01188458A (en) | 1988-01-25 | 1988-01-25 | Production of superconducting ceramic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01188458A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106664212A (en) * | 2014-08-19 | 2017-05-10 | 大众汽车有限公司 | Switch unit, ethernet network, and method for activating components in an ethernet network |
-
1988
- 1988-01-25 JP JP63012674A patent/JPH01188458A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106664212A (en) * | 2014-08-19 | 2017-05-10 | 大众汽车有限公司 | Switch unit, ethernet network, and method for activating components in an ethernet network |
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