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http://dbpedia.org/ontology/abstract Lanthanhexaborid (LaB6) ist eine anorganische Verbindung aus Bor und Lanthan und gehört zu den Boriden. , 六ホウ化ランタン(ろくホウかランタン、lanthanum hexaboride、La六ホウ化ランタン(ろくホウかランタン、lanthanum hexaboride、LaB6、ホウ化ランタンやLaBとも)は、ランタンのホウ化物である無機化合物。融点が2210 °Cの耐火セラミックス材料であり、水と塩酸に不溶である。仕事関数が低く、知られている中で最大の電子放射率の1つであり、真空中で安定である。化学量論的な試料は濃い紫色であり、ホウ素が多い試料(LaB6.07以上)は青色である。イオン衝撃により色は紫色からエメラルドグリーンに変わる。 主な用途は単結晶としてもしくは物理気相成長により堆積されたコーティングとしてのである。六ホウ化ランタン(LaB6)や(CeB6)などの六ホウ化物は約2.5 eVと低い仕事関数を持つ。また、陰極中毒に対していくらか耐性を持つ。六ホウ化セリウム陰極は 1700 Kで六ホウ化ランタンよりも蒸発速度が遅いが、1850 K以上の温度では等しくなる。六ホウ化セリウム陰極は炭素汚染に対する耐性が高いため、六ホウ化ランタンの寿命の1.5倍の寿命を持つ。六ホウ化物の陰極はタングステン陰極よりも約10倍「明るく」、寿命が10-15倍長くなる。六ホウ化物の陰極が使われるデバイスと技術には電子顕微鏡、マイクロ波管、電子リソグラフィー、電子ビーム溶接、X線管、自由電子レーザーがある。六ホウ化ランタンは熱した陰極からゆっくりと蒸発し、と開口部に堆積物を形成する。の大きさ/ひずみ基準として使われ、機器の回折ピークの広がりを較正する。 0.45 Kという比較的低い転移温度を持つ超伝導体でもある。クの広がりを較正する。 0.45 Kという比較的低い転移温度を持つ超伝導体でもある。 , 六硼化镧是一种无机化合物,化学式为LaB6。它是一个超导体,相变温度只有0.45 K。 , Lanthanum hexaboride (LaB6, also called laLanthanum hexaboride (LaB6, also called lanthanum boride and LaB) is an inorganic chemical, a boride of lanthanum. It is a refractory ceramic material that has a melting point of 2210 °C, and is insoluble in water and hydrochloric acid. It is extremely hard, with a Mohs hardness of 9.5. It has a low work function and one of the highest electron emissivities known, and is stable in vacuum. Stoichiometric samples are colored intense purple-violet, while boron-rich ones (above LaB6.07) are blue. Ion bombardment changes its color from purple to emerald green. LaB6 is a superconductor with a relatively low transition temperature of 0.45 K.vely low transition temperature of 0.45 K. , Hexaboreto de lantânio (LaB6, também chamaHexaboreto de lantânio (LaB6, também chamado boreto de lantânio e LaB) é um composto químico inorgânico, um boreto do lantânio. É um material cerâmico refratário que tem um ponto de fusão de 2210 °C, e é insolúvel em água e ácido clorídrico. Ele tem uma baixa função trabalho e uma das mais altas emissividades de elétrons conhecidas, sendo estável no vácuo. Amostras estequiometricas são coloridas de um violeta-púrpura intenso, enquanto aquelas ricas em boro (acima de LaB6.07) são azuis. Borbardeamento por íons altera sua cor de púrpura para verde esmeralda. O principal uso do hexaboreto de lantânio é em cátodos quentes, quer como um cristal único ou como revestimento depositado por deposição física de vapor. Hexaboretos, tais como o hexaboreto de lantânio (LaB6) e hexaboreto de cério (CeB6), tem baixas funções de trabalho, aproximadamente 2,5 eV. Eles também são pouco resistentes ao envenenamento do cátodo. Cátodos de hexaboreto de cério tem uma menor taxa de evaporação a 1700 K que o hexaboreto de lantânio, mas eles tornam-se iguais a temperaturas acima de 1850 K. Cátodos de hexaboreto de cério tem uma e meia vez o tempo de vida dos de hexaboreto de lantânio, devido à anterior maior resistência à contaminação por carbono. Cátodos de hexaboreto são aproximadamente dez vezes mais "brilhantes" que cátodos de tungstênio, e tem 10-15 vezes mais longo tempo de vida. Dispositivos e técnicas nas quais cátodos de hexaboreto são usados incluem microscópios eletrônicos, tubos de microondas, litografia por elétrons, soldagem por feixe de elétrons, tubos de raios X, e laser de elétrons livres. Hexaboreto de lantânio lentamente evapora dos cátodos aquecidos e forma depósitos sobre os cilindroS de Wehnelt e aberturas. LaB6 é também usado como um padrão de tamanho/tensão em difração de pó por raio X para calibrar o alargamento instrumental dos picos de difração. LaB6 é um supercondutor com uma temperatura de transição relativamente baixa de 0,45 K.e transição relativamente baixa de 0,45 K. , L'hexaborure de lanthane (LaB6) ou plus siL'hexaborure de lanthane (LaB6) ou plus simplement le borure de lanthane est un composé inorganique, le borure du lanthane. C'est un matériau céramique réfractaire qui a pour point de fusion 2 210 °C, insoluble dans l'eau et l'acide chlorhydrique. Il a un faible travail de sortie et l'une des plus grandes émissivités d'électrons connues et est stable dans le vide. Les échantillons stœchiométriques ont une couleur violette intense, ceux riches en bore (au-dessus de LaB6,07) sont bleus. Sous l'effet d'un bombardement ionique, sa couleur passe du violet au vert . La principale utilisation de l'hexaborure de lanthane est en cathode chaude (cathode thermoionique), soit à l'état monocristallin ou comme couche de dépôt formé par dépôt physique par phase vapeur (PVD). Les hexaborures tels que l'hexaborure de lanthane ou l'hexaborure de cérium (CeB6) ont des faibles travaux de sortie, d'environ 2,5 eV. Ils sont aussi assez résistants à l'empoisonnement cathodique. Les cathodes d'hexaborure de lanthane ont un taux d'évaporation plus élevé à 1 700 K que celles en hexaborure de cérium, mais ces taux deviennent à peu près égaux au-dessus de 1 850 K. Les cathodes d'hexaborure de lanthane ont aussi une durée de vie d'un tiers plus faible que celles en hexaborure de cérium, ces dernières ayant une meilleure résistance à la contamination au carbone. Les cathodes d'hexaborure sont environ dix fois plus « brillantes » que celles en tungstène et ont une durée de vie 10 à 15 fois plus longue. Parmi les applications et appareils utilisant de telles cathodes, on trouve la microscopie électronique, les tubes à micro-ondes, la lithographie à faisceau d'électrons, le soudage par faisceau d'électrons, les tubes à rayons X et les lasers à électrons libres. L'hexaborure de lanthane s'évapore lentement des cathodes chauffées et forme des dépôts sur les (en) et les ouvertures. LaB6 est aussi utilisé comme standard de souche/taille pour la diffraction de poudre appliquée aux rayons X, afin de calibrer la gamme des pics de diffraction. LaB6 est un supraconducteur avec une température de transition relativement basse, 0,45 K. de transition relativement basse, 0,45 K. , Борид лантана (III) — кристаллы (порошок) темно фиолетового цвета.
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rdfs:comment 六硼化镧是一种无机化合物,化学式为LaB6。它是一个超导体,相变温度只有0.45 K。 , Hexaboreto de lantânio (LaB6, também chamaHexaboreto de lantânio (LaB6, também chamado boreto de lantânio e LaB) é um composto químico inorgânico, um boreto do lantânio. É um material cerâmico refratário que tem um ponto de fusão de 2210 °C, e é insolúvel em água e ácido clorídrico. Ele tem uma baixa função trabalho e uma das mais altas emissividades de elétrons conhecidas, sendo estável no vácuo. Amostras estequiometricas são coloridas de um violeta-púrpura intenso, enquanto aquelas ricas em boro (acima de LaB6.07) são azuis. Borbardeamento por íons altera sua cor de púrpura para verde esmeralda.a sua cor de púrpura para verde esmeralda. , Lanthanum hexaboride (LaB6, also called laLanthanum hexaboride (LaB6, also called lanthanum boride and LaB) is an inorganic chemical, a boride of lanthanum. It is a refractory ceramic material that has a melting point of 2210 °C, and is insoluble in water and hydrochloric acid. It is extremely hard, with a Mohs hardness of 9.5. It has a low work function and one of the highest electron emissivities known, and is stable in vacuum. Stoichiometric samples are colored intense purple-violet, while boron-rich ones (above LaB6.07) are blue. Ion bombardment changes its color from purple to emerald green. LaB6 is a superconductor with a relatively low transition temperature of 0.45 K.vely low transition temperature of 0.45 K. , Lanthanhexaborid (LaB6) ist eine anorganische Verbindung aus Bor und Lanthan und gehört zu den Boriden. , Борид лантана (III) — кристаллы (порошок) темно фиолетового цвета. , 六ホウ化ランタン(ろくホウかランタン、lanthanum hexaboride、La六ホウ化ランタン(ろくホウかランタン、lanthanum hexaboride、LaB6、ホウ化ランタンやLaBとも)は、ランタンのホウ化物である無機化合物。融点が2210 °Cの耐火セラミックス材料であり、水と塩酸に不溶である。仕事関数が低く、知られている中で最大の電子放射率の1つであり、真空中で安定である。化学量論的な試料は濃い紫色であり、ホウ素が多い試料(LaB6.07以上)は青色である。イオン衝撃により色は紫色からエメラルドグリーンに変わる。 0.45 Kという比較的低い転移温度を持つ超伝導体でもある。ルドグリーンに変わる。 0.45 Kという比較的低い転移温度を持つ超伝導体でもある。 , L'hexaborure de lanthane (LaB6) ou plus siL'hexaborure de lanthane (LaB6) ou plus simplement le borure de lanthane est un composé inorganique, le borure du lanthane. C'est un matériau céramique réfractaire qui a pour point de fusion 2 210 °C, insoluble dans l'eau et l'acide chlorhydrique. Il a un faible travail de sortie et l'une des plus grandes émissivités d'électrons connues et est stable dans le vide. Les échantillons stœchiométriques ont une couleur violette intense, ceux riches en bore (au-dessus de LaB6,07) sont bleus. Sous l'effet d'un bombardement ionique, sa couleur passe du violet au vert .ique, sa couleur passe du violet au vert .
rdfs:label 六硼化镧 , 六ホウ化ランタン , Lanthanhexaborid , Hexaboreto de lantânio , Hexaborure de lanthane , Lanthanum hexaboride , Борид лантана
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