JPH02129097A - Operative substance for magnetic freezer - Google Patents
Operative substance for magnetic freezerInfo
- Publication number
- JPH02129097A JPH02129097A JP63280502A JP28050288A JPH02129097A JP H02129097 A JPH02129097 A JP H02129097A JP 63280502 A JP63280502 A JP 63280502A JP 28050288 A JP28050288 A JP 28050288A JP H02129097 A JPH02129097 A JP H02129097A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- ions
- single crystal
- garnet
- refrigeration
- 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.)
- Granted
Links
- 239000000126 substance Substances 0.000 title abstract description 4
- 150000002500 ions Chemical class 0.000 claims abstract description 24
- 239000013078 crystal Substances 0.000 claims abstract description 19
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 10
- 239000002223 garnet Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 229910052692 Dysprosium Inorganic materials 0.000 claims abstract description 4
- 229910052691 Erbium Inorganic materials 0.000 claims abstract description 4
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 3
- 238000005057 refrigeration Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 9
- 150000002910 rare earth metals Chemical class 0.000 claims description 8
- 238000007865 diluting Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 abstract description 12
- 230000003993 interaction Effects 0.000 abstract description 3
- 239000008207 working material Substances 0.000 description 8
- 238000010790 dilution Methods 0.000 description 6
- 239000012895 dilution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000005303 antiferromagnetism Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005408 paramagnetism Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- -1 Karimi heavy vanes Chemical class 0.000 description 1
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005245 sintering Methods 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Landscapes
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、ＩＫ以下の、極低温環境を効率よく生成する
磁気冷凍機用の作業物質に関するものであり、特には希
土類磁性イオン（Ｇｄ、Ｄｙ等）を含むガーネットを非
磁性イオン（Ｙ、Ｌａ等）により希釈したことを特徴と
する磁気冷凍作業物質に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a working material for a magnetic refrigerator that efficiently generates an extremely low temperature environment below IK. The present invention relates to a magnetic refrigeration material that is diluted with non-magnetic ions (Y, La, etc.).
本発明磁気冷凍作業物質は宇宙その他の極限環境を含め
た広い分野での利用が期待される。The magnetic refrigeration material of the present invention is expected to be used in a wide range of fields including space and other extreme environments.
Ｌ＆立且ｌ
磁気冷凍法は、磁性体を強磁界中に置き、磁気スピンを
整列状態にすると発熱が起こり、この熱を取り去った後
磁界を除いて磁気スピンをかく乱状態とすると吸熱が起
こり、外部の冷凍対象物から熱を奪い冷凍作用を示す現
象を原理とするものである。磁気冷凍法は、従来からの
気体圧縮−膨張冷凍法に比べて、冷凍効率が高いこと、
圧縮機が不要なこと、小型軽量化等の多くの優れた特徴
を有しており、特に現在では絶対零度に近い超低温の環
境を生成するシステムとして、宇宙その他の極限環境を
含めた広い分野での利用が期待されている。In the magnetic freezing method, heat is generated when a magnetic material is placed in a strong magnetic field and the magnetic spins are aligned, and when this heat is removed and the magnetic field is removed to disturb the magnetic spins, heat absorption occurs. It is based on the phenomenon of removing heat from external objects to be frozen and exhibiting a freezing effect. Magnetic refrigeration has higher refrigeration efficiency than conventional gas compression-expansion refrigeration.
It has many excellent features such as no need for a compressor, small size and light weight, and is currently being used in a wide range of fields including space and other extreme environments as a system that generates ultra-low temperature environments close to absolute zero. is expected to be used.
しかしながら、ＩＫ以下の生成を目標とした場合、従来
用いられて来たカリミ重−バン等の磁性イオンを含んだ
水和物は、いずれも吸・脱水による変質等化学的安定性
に乏しい為、取扱いが極めて困難である上、熱伝導率が
悪（、カルノーサイクルによる連続的な磁気冷凍サイク
ルを実現するための致命的な障害となっていた。However, when the goal is to produce a product with an IK or less, the conventionally used hydrates containing magnetic ions, such as Karimi heavy vanes, have poor chemical stability such as deterioration due to absorption and dehydration. In addition to being extremely difficult to handle, it had poor thermal conductivity (which was a fatal obstacle to realizing a continuous magnetic refrigeration cycle using the Carnot cycle).
１に以下の生成には、磁性イオンを含み、それらの磁気
的相互作用が弱く、転移温度の低い磁性体が要求される
。希土類の磁性イオン（Ｇｄ。1. The following generation requires a magnetic material that contains magnetic ions, has weak magnetic interaction, and has a low transition temperature. Rare earth magnetic ions (Gd.
Ｄｙ等）を含むＧＧＧやＤＡＧとして知られるガーネッ
ト型単結晶は磁気熱量効果が大きく熱伝導率が高いこと
で知られており、１．８にや４．２Ｋを生成する磁気冷
凍に用いられてはきたが、これらは常磁性から反強磁性
への転移温度が高いために、ＩＫ以下のカルノーサイク
ルの実行には不十分である。Garnet-type single crystals known as GGG and DAG, which contain Dy, etc.), are known to have a large magnetocaloric effect and high thermal conductivity, and are used in magnetic refrigeration that generates between 1.8 and 4.2 K. However, these materials have a high transition temperature from paramagnetism to antiferromagnetism, so they are insufficient to carry out the Carnot cycle below IK.
また、固体レーザ用材料として知られているＥｒ又はＮ
ｄのイオンをドープしたＹＡＧ （Ｙ−ＡＩＢＯｌｌ）
単結晶を用いた断熱消磁の報告も為されているが、冷凍
機を考えた時その冷却能力の低さが問題であった。即ち
、この場合は、非磁性体のＹＡＧ９９％に対し、Ｅｒ、
Ｎｄ等の磁性体を１％添加するものであるが、その結果
として到達温度は０°Ｋに近く、申し分ないが、冷却能
力値が極めて低い値であった。In addition, Er or N, which is known as a material for solid-state lasers,
YAG doped with d ions (Y-AIBOll)
There have been reports of adiabatic demagnetization using single crystals, but when considering refrigerators, their low cooling capacity was a problem. That is, in this case, Er,
Although 1% of a magnetic material such as Nd was added, the temperature reached was close to 0°K, which was satisfactory, but the cooling capacity value was extremely low.
が よ と る
近時、宇宙その他の極限環境を含めた広い分野での応用
技術への関心が高まりつつある。それに伴ない、磁気冷
凍は非常に重要な手段となっており、上記の問題点を解
決し、取扱いが容易なことに加えて、熱伝導率が良（、
十分な冷凍能力を得ることのできる、１に以下の超低温
を生成可能な磁気冷凍作業物質の開発が切望されている
。In recent years, there has been increasing interest in applied technologies in a wide range of fields, including space and other extreme environments. Along with this, magnetic refrigeration has become an extremely important means, and in addition to solving the above problems and being easy to handle, it also has good thermal conductivity (
There is a strong need for the development of a magnetic refrigeration material that can generate ultra-low temperatures of 1 or less and has sufficient refrigeration capacity.
本発明の目的は、上記の要求を満たす新規な磁気冷凍作
業物質を開発することである。The aim of the present invention is to develop a new magnetic refrigeration working material that meets the above requirements.
占 ゛するための
既に述べたように、希土類の磁性イオンを含むガーネッ
ト型単結晶は磁気熱量効果が大きく熱伝導率が高いこと
で知られており、１．８にや４．２Ｋを生成する磁気冷
凍に用いられて来た。しかし、これは常磁性から反強磁
性への転移温度が高いために、ＩＫ以下の超低温の創出
は困難視されていた。しかし、本発明者等は、その固有
の優れた性能に注目し、その転移温度の低減化を試みる
べく研究を重ねた結果、希土類の磁性イオンを含むガー
ネット型単結晶の磁性イオンの一部を非磁性イオン（Ｙ
、Ｌａ等）で置換して磁気的相互作用を希釈することに
より、ここに初めて転移温度を低下させ、ＩＫ以下の超
低温を実現することに成功した。As mentioned above, garnet-type single crystals containing rare earth magnetic ions are known to have a large magnetocaloric effect and high thermal conductivity, generating between 1.8 and 4.2 K. It has been used for magnetic refrigeration. However, since the transition temperature from paramagnetism to antiferromagnetism is high, it has been considered difficult to create an ultra-low temperature below IK. However, the inventors of the present invention focused on its inherent excellent performance, and as a result of repeated research in an attempt to reduce its transition temperature, the present inventors discovered that some of the magnetic ions in garnet-type single crystals, including rare earth magnetic ions, Non-magnetic ion (Y
, La, etc.) to dilute the magnetic interaction, we succeeded for the first time in lowering the transition temperature and achieving an ultra-low temperature below IK.
この知見に基づいて、本発明は、
組成式（Ｒ＋−Ｄ−） ｓ Ｂｉ ０１＊（Ｒ＝Ｇｄ、
Ｄｙ、Ｅｒ等の１種以上の希土類磁性イオン
Ｉ）＝＋Ｙ、Ｌａ等の１種以上の非磁性イオンＢ＝Ｇａ
及び又はＡ１
で表わされ、且つＸの値が
０、１０≦ｘ≦０．７０
の範囲にある）
を有する、希土類磁性イオンを含むガーネット単結晶を
非磁性イオンにより希釈したことを特徴とする磁気冷凍
作業物質を堤供する。Based on this knowledge, the present invention has the following compositional formula (R+-D-) s Bi 01* (R=Gd,
One or more rare earth magnetic ions such as Dy and Er I) = +One or more non-magnetic ions such as Y and La B = Ga
and or A1, and the value of Provide magnetic refrigeration working materials.
１肚立＾盗工ｆ１
本発明で使用される磁気冷凍方式自体は周知である。第
３図の原理図に示すように、従来の方式と同様に磁気冷
凍作業物質１に吸熱、排熱用熱スィッチ２．３を取り付
け、マグネット４によってカルノーサイクルを制御する
。カルノーサイクルの実行に対しては作業物質の高熱伝
導性が要求される。The magnetic refrigeration system itself used in the present invention is well known. As shown in the principle diagram of FIG. 3, a thermal switch 2.3 for absorbing and exhausting heat is attached to the magnetically refrigerated material 1, and the Carnot cycle is controlled by the magnet 4, as in the conventional method. High thermal conductivity of the working material is required for the implementation of the Carnot cycle.
本発明で用いる材料は、（Ｒ，、Ｄ、）、 Ｂ、０．２
の組成を有するガーネット型単結晶である。ここで、Ｒ
＝Ｇｄ、Ｄｙ、Ｅｒ、Ｃｅ、Ｎｄ、Ｓｍ。The material used in the present invention is (R,,D,), B, 0.2
It is a garnet type single crystal with a composition of Here, R
=Gd, Dy, Er, Ce, Nd, Sm.
Ｅｕ、Ｔｂ、Ｈｏ等の少なくとも１種の希土類磁性イオ
ン
Ｄ＝Ｙ、Ｌａ等の少なくとも１種の非磁性イオン
Ｂ＝Ｇａ及び又はＡＩ
０．１０≦ｘ≦０．７０
を表わす。At least one rare earth magnetic ion such as Eu, Tb, Ho, etc. D=Y, at least one non-magnetic ion such as La, B=Ga, and/or AI 0.10≦x≦0.70.
希土類の磁性イオンを含むガーネット型単結晶は磁気熱
量効果が大きく熱伝導率が高いため、従来１．８にや４
．２Ｋを生成する磁気冷凍に用いられて来たものである
。しかし常磁性から反強磁性への転移温度が高い為、従
来ＩＫ以下の生成は困難とされてきた０本発明は、磁性
イオンの一部を非磁性イオンで置換することによって磁
気的相互作用を希釈し、転移温度を低下させることによ
り、ＩＫ以下の生成を可能としたものである。Garnet-type single crystals containing rare earth magnetic ions have a large magnetocaloric effect and high thermal conductivity.
．． It has been used in magnetic refrigeration to generate 2K. However, due to the high transition temperature from paramagnetism to antiferromagnetism, it has been considered difficult to generate IK or less. By diluting it and lowering the transition temperature, it is possible to produce it at a temperature below IK.
上記組成式のＸは、制限範囲未満にすると、十分な転移
温度の低下が得られず、ＩＫ以下の生成は困難であり、
他方上記の制限範囲を超えると十分な冷凍能力を得るこ
とができないので上記の範囲内で選ぶことが必要である
。本発明磁気冷凍用作業物質は、適正な希釈度Ｘの選択
により０．２〜０．５にの最低到達温度と、１５以上の
冷凍能力を提供する。If X in the above compositional formula is less than the limited range, a sufficient reduction in the transition temperature will not be obtained and it will be difficult to produce a temperature below IK,
On the other hand, if it exceeds the above-mentioned limit range, sufficient refrigerating capacity cannot be obtained, so it is necessary to select it within the above-mentioned range. The working material for magnetic refrigeration of the present invention provides a minimum temperature of 0.2 to 0.5 and a refrigeration capacity of 15 or more by selecting an appropriate dilution X.
本ガーネット単結晶の熱伝導率はＧＧＧとほぼ同様で、
４にで無酸素銅のｌ／１０程度とカルノーサイクルの実
行に対して必要とされる十分の高熱伝導性を有している
。The thermal conductivity of this garnet single crystal is almost the same as GGG,
It has a high thermal conductivity of about 1/10 that of oxygen-free copper, which is sufficient for carrying out the Carnot cycle.
化学的にも安定であり吸湿性もないので取扱いは従来に
比べて極めて容易になる。It is chemically stable and non-hygroscopic, making handling much easier than before.
また冷凍能力も組成式制限範囲内であれば、熱伝導率の
値が従来のものに比べて１０から１００倍程度大きいの
で、希釈による冷凍能力の低下分、サイクルの高速化に
より補うことが可能となり、トータルとしての冷凍能力
は従来のものと同程度以上を得ることができる。In addition, if the refrigerating capacity is within the composition formula limit, the thermal conductivity value is about 10 to 100 times higher than that of conventional ones, so the decrease in refrigerating capacity due to dilution can be compensated for by speeding up the cycle. Therefore, the total refrigerating capacity can be equivalent to or higher than that of the conventional system.
本発明に従う（Ｒ，一つり。）ｉ Ｂ１０１ｓの組成を
有するガーネット型単結晶は、磁性及び非磁性種それぞ
れの酸化物原料粉な混合（ボールミル等）し、金型ブレ
ス、ＣＩＰ等で成形後、焼結（１１００〜１５５０℃）
し、チョクラルスキー法等により単結晶とすることによ
り製造される。A garnet-type single crystal having a composition of (R, one) i B101s according to the present invention is obtained by mixing magnetic and non-magnetic oxide raw material powders (by ball mill, etc.), molding by mold press, CIP, etc. , sintering (1100-1550℃)
It is produced by forming it into a single crystal using the Czochralski method or the like.
Ｋ１週
磁気冷凍作業物質として従来主に１．８にの生成に用い
られている、ガーネット型単結晶ＧＧＧ（Ｇｄｓ Ｇａ
ｓ Ｏ□）を非磁性イオンであるＹで希釈する場合につ
いての実施例を示す、この場合の磁気冷凍用作業物質組
成式は
（Ｇｄ＋−ｘ Ｙｌｌ） ｓ Ｇａｓ Ｏ＋諺である。Garnet type single crystal GGG (Gds Ga
s O□) is diluted with Y, which is a non-magnetic ion, and the compositional formula of the working material for magnetic refrigeration in this case is (Gd+-x Yll) s Gas O+.
希釈度ｘ ＝ ０．１とｘ＝Ｏ１４の２種類を作製した
。Two types of dilutions were prepared: x = 0.1 and x = O14.
原料粉としてのｃａｘｏｓ 、 ｙｔｏｓ及びＧａ＊Ｏ
ｓを所定の比率でボールミルで充分に混合し、金型ブレ
スにて成形後、１２００℃の温度で２４時間焼成した。caxos, ytos and Ga*O as raw material powders
s were thoroughly mixed in a predetermined ratio in a ball mill, molded in a mold press, and then fired at a temperature of 1200° C. for 24 hours.
この焼結体３５０ｇからチョクラルスキー弓上法により
単結晶を作製した。A single crystal was produced from 350 g of this sintered body by the Czochralski bow method.
チョクラルスキー引上条件は次の通りである＝Ｉｒ製ル
ツボ：５０ＩＩＩＩ１１直径Ｘ５０ｍｍ高さ雰囲気：
Ｎ、＋ ２％０８
Ｘ＝αｌ ２０ ｒｐａ＋ ２ ａｍ
／ｈｒｘ ＝ ０．４ ５ Ｏｒｐｍ
２ ａｍ／ｈｒ作製された単結晶（ｘ ＝ ０．２及び
０．４）について４テスラの磁界で４．２Ｋから断熱消
磁をした際の最低到達温度の実験結果を第１図に示す、
生じした低到達温度は転移温度を反映しているので転移
温度も同様の変化を与えていると考えてよい。Czochralski pulling conditions are as follows = Ir crucible: 50III11 diameter x 50mm height Atmosphere:
N, + 2%08 X=αl 20 rpa+ 2 am
/hrx = 0.4 5 Orpm
Figure 1 shows the experimental results of the lowest temperature reached when adiabatic demagnetization was performed from 4.2 K in a 4 Tesla magnetic field for single crystals (x = 0.2 and 0.4) produced at 2 am/hr.
Since the resulting low temperature reflects the transition temperature, it can be considered that the transition temperature also changes in the same way.
実験結果から非磁性イオンの希釈による転移温度低下の
効果は明らかである。ｘ＝０．１の結晶でもｘ＝０（Ｇ
ＧＧ）に対して最低到達温度が約１０％以上低下してい
る。From the experimental results, the effect of lowering the transition temperature by diluting nonmagnetic ions is clear. Even for a crystal with x=0.1, x=0(G
GG), the lowest temperature reached is about 10% or more lower.
他方、ＩＫにおける冷凍能力は第２図に示すように希釈
度により低下する。On the other hand, the refrigerating capacity of IK decreases with dilution as shown in FIG.
両者を勘案することにより、本発明は、所定の冷凍能力
を保持しつつ０．２〜０．５にの、ＩＫ以下の超低温生
成に、ガーネット型単結晶の使用を可能ならしめるもの
である。By taking both into consideration, the present invention makes it possible to use a garnet type single crystal for ultra-low temperature production below IK of 0.2 to 0.5 while maintaining a predetermined refrigeration capacity.
免豆立立呈
本発明は、所定の冷凍能力を保持しつつＩＫ以下の超低
温生成を可能ならしめるものである０本発明ガーネット
単結晶の熱伝導率はＧＧＧとほぼ同様で、４にで無酸素
銅の１０００程度と十分な値を有しカルノーサイクルの
実行に対して必要とされる十分の高熱伝導性を有してい
る。化学的にも安定であり吸湿性もないので取扱いは従
来に比べて極めて容易になる。こうした特性から、本発
明磁気冷凍作業物質は宇宙その他の極限環境を含めた広
い分野での利用が期待される。The present invention enables ultra-low temperature production below IK while maintaining a predetermined refrigeration capacity.The thermal conductivity of the garnet single crystal of the present invention is almost the same as that of GGG, and it is It has a sufficiently high thermal conductivity of about 1000 compared to oxygen copper, and has a sufficiently high thermal conductivity required for carrying out the Carnot cycle. It is chemically stable and non-hygroscopic, making handling much easier than before. Due to these characteristics, the magnetic refrigeration material of the present invention is expected to be used in a wide range of fields including space and other extreme environments.
第１図は、磁気冷凍用作業物質を使用する磁気冷凍方式
の原理図である。
第２図は、本発明磁気冷凍用作業物質を使用しての最低
到達温度と希釈度との関係を示すグラフである。
第３図は、希釈度とＩＫにおける冷凍能力の関係を示す
グラフである。
１：磁気冷凍作業物質
２．３：吸熱、排熱用熱スィッチ
４：マグネット
１に
二あ！する：ぐｑ東能力（Ｊ）
第３図FIG. 1 is a diagram showing the principle of a magnetic refrigeration system using a working material for magnetic refrigeration. FIG. 2 is a graph showing the relationship between the lowest temperature reached and the degree of dilution using the working material for magnetic refrigeration of the present invention. FIG. 3 is a graph showing the relationship between dilution and refrigerating capacity at IK. 1: Magnetic refrigeration working substance 2.3: Heat absorption/exhaust heat switch 4: Magnet 1! Do: Guq East ability (J) Figure 3
Claims (1)
＿２（Ｒ＝Ｇｄ、Ｄｙ、Ｅｒ等の１種以上の希土類磁性
イオン Ｄ＝Ｙ、Ｌａ等の１種以上の非磁性イオン Ｂ＝Ｇａ及び又はＡｌ で表わされ、且つｘの値が ０．１０≦ｘ≦０．７０ の範囲にある） を有する、希土類磁性イオンを含むガーネット単結晶を
非磁性イオンにより希釈したことを特徴とする磁気冷凍
作業物質。[Claims] 1) Composition formula (R_1_-_xD_x)_3B_5O_1
_2 (R = one or more rare earth magnetic ions such as Gd, Dy, Er, etc. D = one or more nonmagnetic ions such as Y, La, etc. B = Ga and/or Al, and the value of x is 0. 10≦x≦0.70) A magnetic refrigeration material characterized by diluting a garnet single crystal containing rare earth magnetic ions with non-magnetic ions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63280502A JP2694545B2 (en) | 1988-11-08 | 1988-11-08 | Magnetic refrigeration working substance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63280502A JP2694545B2 (en) | 1988-11-08 | 1988-11-08 | Magnetic refrigeration working substance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02129097A true JPH02129097A (en) | 1990-05-17 |
| JP2694545B2 JP2694545B2 (en) | 1997-12-24 |
Family
ID=17625984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63280502A Expired - Lifetime JP2694545B2 (en) | 1988-11-08 | 1988-11-08 | Magnetic refrigeration working substance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2694545B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3671065A1 (en) * | 2018-12-20 | 2020-06-24 | Commissariat à l'énergie atomique et aux énergies alternatives | Cooling device comprising a paramagnetic garnet ceramic |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0218394A (en) * | 1988-07-05 | 1990-01-22 | Natl Res Inst For Metals | Rare earth element-al garnet single crystal body |
-
1988
- 1988-11-08 JP JP63280502A patent/JP2694545B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0218394A (en) * | 1988-07-05 | 1990-01-22 | Natl Res Inst For Metals | Rare earth element-al garnet single crystal body |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3671065A1 (en) * | 2018-12-20 | 2020-06-24 | Commissariat à l'énergie atomique et aux énergies alternatives | Cooling device comprising a paramagnetic garnet ceramic |
| FR3090830A1 (en) * | 2018-12-20 | 2020-06-26 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | COOLING DEVICE COMPRISING A PARAMAGNETIC GRENAT CERAMIC |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2694545B2 (en) | 1997-12-24 |
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