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関連する概念動画

Ionic Crystal Structures02:42

Ionic Crystal Structures

20.6K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
20.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.8K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.8K
Qualitative Analysis03:46

Qualitative Analysis

28.6K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
28.6K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

49.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
49.7K
Hydration of Cement01:24

Hydration of Cement

1.6K
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
1.6K
The Phosphorus Cycle01:21

The Phosphorus Cycle

44.9K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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関連する実験動画

Updated: Mar 28, 2026

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

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(1) Ceresで太陽系の外部に起源を持つアンモニア化フィロシリケート

M C De Sanctis1, E Ammannito1,2, A Raponi1

  • 1Istituto di Astrofisica e Planetologia Spaziali, INAF, Via del Fosso del Cavaliere 100, 00133 Roma, Italy.

Nature
|December 15, 2015
PubMed
まとめ

矮星セレスのスペクトルは 広範囲に広がるアンモニアのフィロシリケートを示し 検出可能な水氷ではありません これは,太陽系外部の物質が形成中にセレスに組み込まれていたことを示唆している.

さらに関連する動画

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

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Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
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Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Published on: May 11, 2017

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関連する実験動画

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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

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Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
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科学分野:

  • 惑星科学
  • 天体生物学
  • ミネラロジー

背景:

  • 矮惑星セレスの表面構成は議論されており,CIとCMの炭酸性コンドライトを含む類似物が提案されている.
  • 以前の研究では,セレスの表面に粘土鉱物,アンモニア化フィロシリケート,またはブルシートがあることが示唆されました.
  • 限られたスペクトルデータは,特に2.5〜2.9マイクロメートルの範囲で,表面材料の決定的な識別を妨げました.

研究 の 目的:

  • 新しいスペクトルデータを用いて 矮星セレスの表面構成を調査する
  • セレスの表面に存在する特定の鉱物や揮発性物質を特定する
  • セレスの物質の起源と進化を理解するために

主な方法:

  • 0.4〜5マイクロメートルの波長範囲でセレスのスペクトルを取得.
  • 地表から約82,000kmから4,300kmまでの距離を測定した.
  • ミネラロジカルシグネチャーを特定するためのスペクトルデータの分析.

主要な成果:

  • 広範囲に広がったアンモニア化フィロシリケートがセレスの表面で検出されました.
  • 表面に検出可能な水氷は見つかりませんでした.
  • アンモニアはセレスの分化過程でフィロシリケートと反応した可能性がある.

結論:

  • セレスの表面の構成は,アンモニア化フィロシリケートによって支配され,広範囲に広がる水の氷に関する以前の仮説に異議を唱える.
  • アンモニアの存在は,太陽系外部の物質がセレスに組み込まれていることを示唆しています.
  • これは,大太陽中心の距離での形成か,または後に揮発性物質の蓄積を意味する.