- Aug 26 Fri 2011 13:29
-
氧氯化锆www.tool-tool.com
- Aug 26 Fri 2011 13:25
-
立方氧化鋯www.tool-tool.com
立方氧化鋯（Cubic Zirconia，簡稱 CZ），亦被稱作「方晶鋯石」、「蘇聯鑽」或「蘇聯石」，
是二氧化鋯（Zirconia，ZrO2）晶體的一種。氧化鋯天然存在時大部份為單斜晶體（mono-clinic），主要以礦物「鈄鋯石」
（Baddeleyite）存在。以立方單晶體存在的氧化鋯在天然中極為罕有，但現時經常以人工方法合成，被廣泛用作鑽石的代替品。因為這種人工合成方法
在蘇聯發明及最先使用，故此立方氧化鋯亦被稱為「蘇聯鑽」或「蘇聯石」。立方氧化鋯有時被稱作「方晶鋯石」，但這名稱並不完全正確；因為鋯石
（Zircon）是天然存在寶石的一種，其化學成份為矽酸鋯（Zirconium
Silicate，ZrSiO4），與合成的立方氧化鋯為兩種不相同的物質；而且氧化鋯的方晶相其實還分為立方晶（Cubic）及正方晶
（Tetragonal）兩種。
是二氧化鋯（Zirconia，ZrO2）晶體的一種。氧化鋯天然存在時大部份為單斜晶體（mono-clinic），主要以礦物「鈄鋯石」
（Baddeleyite）存在。以立方單晶體存在的氧化鋯在天然中極為罕有，但現時經常以人工方法合成，被廣泛用作鑽石的代替品。因為這種人工合成方法
在蘇聯發明及最先使用，故此立方氧化鋯亦被稱為「蘇聯鑽」或「蘇聯石」。立方氧化鋯有時被稱作「方晶鋯石」，但這名稱並不完全正確；因為鋯石
（Zircon）是天然存在寶石的一種，其化學成份為矽酸鋯（Zirconium
Silicate，ZrSiO4），與合成的立方氧化鋯為兩種不相同的物質；而且氧化鋯的方晶相其實還分為立方晶（Cubic）及正方晶
（Tetragonal）兩種。
- Aug 26 Fri 2011 13:22
-
Cubic zirconia www.tool-tool.com
The RF induction coils function in a manner
similar to the primary winding in a transformer. The zirconia acts as
the "secondary winding" of a transformer which in effect is "shorted"
out and thus gets hot. This heating method requires the introduction of
small pieces of zirconium metal. The metal is placed near the outside
of the charge and is melted by the RF coils and heats the surrounding
zirconia powder from the outside inwards. The cooling water-filled
pipes embracing the outer surface maintain a thin "skin" (1–2 mm) of
unmelted feed, creating a self-contained apparatus. After several hours
the temperature is reduced in a controlled and gradual manner,
resulting in the formation of flawless columnar crystals. Prolonged
annealing at 1400°C is then carried out to remove any strain. The
annealed crystals, which are typically 5 cm long by 2.5 cm wide
(although they may be grown much larger), are then cut into gemstones.
similar to the primary winding in a transformer. The zirconia acts as
the "secondary winding" of a transformer which in effect is "shorted"
out and thus gets hot. This heating method requires the introduction of
small pieces of zirconium metal. The metal is placed near the outside
of the charge and is melted by the RF coils and heats the surrounding
zirconia powder from the outside inwards. The cooling water-filled
pipes embracing the outer surface maintain a thin "skin" (1–2 mm) of
unmelted feed, creating a self-contained apparatus. After several hours
the temperature is reduced in a controlled and gradual manner,
resulting in the formation of flawless columnar crystals. Prolonged
annealing at 1400°C is then carried out to remove any strain. The
annealed crystals, which are typically 5 cm long by 2.5 cm wide
(although they may be grown much larger), are then cut into gemstones.
- Aug 26 Fri 2011 13:19
-
Фианит www.tool-tool.com
Фиани́тът (наричан още кубичен цирконий) е скъпоценен камък, произведен в лабораторни условия чрез кристализация.
Представлява диоксид на циркония с кубическа кристална решетка, съкратено кубичен цирконий (от руски кубический цирконий, от английски cubic zirconia
CZ), стабилизиран с добавки на оксид на манган, калций и итрий. За
оцветяване на безцветния диоксид на циркония в различни цветове се
добавят преходни и редкоземни елементи. Тъй като кристалната му
структура силно наподобява тази на диаманта, той е широко използван
като негов синтетичен заместител. Свойствата му също се доближават до
тези на диаманта: голяма твърдост (8,5 по скалата на Моос) и голяма
специфична плътност (5,6-6). Показателят му на пречупване (2,17 - 2,18)
също е близък до този на диаманта (2,417) и затова трудно могат да бъдат
различени с просто око.
Представлява диоксид на циркония с кубическа кристална решетка, съкратено кубичен цирконий (от руски кубический цирконий, от английски cubic zirconia
CZ), стабилизиран с добавки на оксид на манган, калций и итрий. За
оцветяване на безцветния диоксид на циркония в различни цветове се
добавят преходни и редкоземни елементи. Тъй като кристалната му
структура силно наподобява тази на диаманта, той е широко използван
като негов синтетичен заместител. Свойствата му също се доближават до
тези на диаманта: голяма твърдост (8,5 по скалата на Моос) и голяма
специфична плътност (5,6-6). Показателят му на пречупване (2,17 - 2,18)
също е близък до този на диаманта (2,417) и затова трудно могат да бъдат
различени с просто око.
- Aug 26 Fri 2011 13:15
-
二氧化鋯 www.tool-tool.com
二氧化鋯（化學式：ZrO2）是鋯的主要氧化物，通常狀況下為白色無臭無味晶體，難溶於水、鹽酸和稀硫酸。一般
常含有少量的二氧化鉿。化學性質不活潑，但高熔點、高電阻率、高折射率和低熱膨脹係數的性質，使它成為重要的耐高溫材料、陶瓷絕緣材料和陶瓷遮光劑。能帶
間隙大約為5-7eV。
常含有少量的二氧化鉿。化學性質不活潑，但高熔點、高電阻率、高折射率和低熱膨脹係數的性質，使它成為重要的耐高溫材料、陶瓷絕緣材料和陶瓷遮光劑。能帶
間隙大約為5-7eV。
- Aug 26 Fri 2011 13:12
-
ジルコニア www.tool-tool.com
ジルコニア（二酸化ジルコニウム、化学式：ZrO2）は 、ジルコニウムの酸化物である。常態では白色の固体。融点が2700℃と高いため、耐熱性セラミックス材料として利用されている。また、透明でダイヤモンドに近い高い屈折率を有することから模造ダイヤとも呼ばれ、宝飾品としても用いられている。
天然にはバッデレイ石 (Baddeleyite) として産出する。
結晶構造と機械的性質 [編集]
天然にはバッデレイ石 (Baddeleyite) として産出する。
結晶構造と機械的性質 [編集]
- Aug 26 Fri 2011 13:09
-
Zirconium dioxide www.tool-tool.com
Zirconium dioxide (ZrO2), sometimes known as zirconia
(not to be confused with zircon), is a white crystalline oxide of
zirconium. Its most naturally occurring form, with a monoclinic
crystalline structure, is the rare mineral baddeleyite. The high
temperature cubic crystalline form is rarely found in nature as mineral
tazheranite (Zr,Ti,Ca)O2 (and a doubtful mineral arkelite). This form,
also called cubic zirconia, is synthesized in various colours for use as
a gemstone and a diamond simulant.
(not to be confused with zircon), is a white crystalline oxide of
zirconium. Its most naturally occurring form, with a monoclinic
crystalline structure, is the rare mineral baddeleyite. The high
temperature cubic crystalline form is rarely found in nature as mineral
tazheranite (Zr,Ti,Ca)O2 (and a doubtful mineral arkelite). This form,
also called cubic zirconia, is synthesized in various colours for use as
a gemstone and a diamond simulant.
- Aug 26 Fri 2011 13:06
-
Оксид циркония(IV) www.tool-tool.com
Оксид циркония — ZrO2 (диоксид циркония), бесцветные кристаллы, tпл= 2715 °C. Оксид циркония - один из наиболее тугоплавких оксидов металлов.
Диоксид
циркония проявляет амфотерные свойства, нерастворим в воде и водных
растворах большинства кислот и щёлочей, однако растворяется в плавиковой
и концентрированной серной кислотах, расплавах щелочей и стёклах.
Диоксид
циркония проявляет амфотерные свойства, нерастворим в воде и водных
растворах большинства кислот и щёлочей, однако растворяется в плавиковой
и концентрированной серной кислотах, расплавах щелочей и стёклах.
- Aug 26 Fri 2011 13:03
-
Oxid zirkoničitý www.tool-tool.com
Oxid zirkoničitý ZrO2, někdy označovaný jako zirkonia, je bílá krystalická látka s hustotou 5,89 g/cm³. Pokud neobsahuje příliš příměsí má při pokojové teplotě jednoklonnou
(monoklinickou) krystalovou strukturu – tak jako přírodní vzácně se
vyskytující minerál baddeleyit. Při vyšších teplotách (1170 °C) dochází k
fázové přeměně na čtverečnou (tetragonální) strukturu (typu rutilu) a při velmi vysokých teplotách (2370 °C) se stává stabilní krychlová (kubická) struktura (typu fluoritu), která taje až při 2715 °C.
(monoklinickou) krystalovou strukturu – tak jako přírodní vzácně se
vyskytující minerál baddeleyit. Při vyšších teplotách (1170 °C) dochází k
fázové přeměně na čtverečnou (tetragonální) strukturu (typu rutilu) a při velmi vysokých teplotách (2370 °C) se stává stabilní krychlová (kubická) struktura (typu fluoritu), která taje až při 2715 °C.
- Aug 12 Fri 2011 08:08
-
氰化金鉀 68.3%www.tool-tool.com
氰化金鉀 68.3%
性質 外觀 白色結晶粉末 金含量 (i) 68.3 ± 0.1% (以重量計) 分子量 288.10 溶解度 100毫升水(20°C)可以把22.0克氰化金鉀完全溶解。 金純度 99.99% 驗證 金含量 重量分析法 精細量 電感偶合等離子體─原子發射光譜分析法 金屬雜質 (ii) 銀 < 20ppm 鎳 < 10ppm 銅 < 10ppm 鐵 < 10ppm 鉛 < 10ppm 鋅 < 10ppm 不溶物質 < 0.1% (以重量計) 溶液穩定性 用鄰苯二甲酸氫鉀緩衝劑把10%w/v溶液調校到pH3.5後，溶液能夠保持清晰。 濕份含量
性質 外觀 白色結晶粉末 金含量 (i) 68.3 ± 0.1% (以重量計) 分子量 288.10 溶解度 100毫升水(20°C)可以把22.0克氰化金鉀完全溶解。 金純度 99.99% 驗證 金含量 重量分析法 精細量 電感偶合等離子體─原子發射光譜分析法 金屬雜質 (ii) 銀 < 20ppm 鎳 < 10ppm 銅 < 10ppm 鐵 < 10ppm 鉛 < 10ppm 鋅 < 10ppm 不溶物質 < 0.1% (以重量計) 溶液穩定性 用鄰苯二甲酸氫鉀緩衝劑把10%w/v溶液調校到pH3.5後，溶液能夠保持清晰。 濕份含量
- Aug 12 Fri 2011 07:57
-
鍍 金www.tool-tool.com
- Aug 04 Thu 2011 09:04
-
Gold www.tool-tool.com
Gold ( /ˈɡoʊld/) is a chemical element with the symbol Au (from Latin: aurum "gold") and an atomic number of 79. Gold is a dense, soft, shiny metal and the most malleable and ductile metal known.[citation needed]
Pure gold has a bright yellow color and luster traditionally
considered attractive, which it maintains without oxidizing in air or
water. Chemically, gold is a transition metal and a group 11 element.
It is one of the least reactive solid chemical elements. The metal
therefore occurs often in free elemental (native) form, as nuggets or
grains in rocks, in veins and in alluvial deposits. Less commonly, it
occurs in minerals as gold compounds, usually with tellurium.
Pure gold has a bright yellow color and luster traditionally
considered attractive, which it maintains without oxidizing in air or
water. Chemically, gold is a transition metal and a group 11 element.
It is one of the least reactive solid chemical elements. The metal
therefore occurs often in free elemental (native) form, as nuggets or
grains in rocks, in veins and in alluvial deposits. Less commonly, it
occurs in minerals as gold compounds, usually with tellurium.
