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Preparation method of neodymium calcium aluminate

A neodymium calcium aluminate and nitrate technology, applied in chemical instruments and methods, rare earth metal compounds, inorganic chemistry and other directions, can solve the problems of high preparation temperature and long preparation time of neodymium calcium aluminate, and overcome the long synthesis cycle, The effect of good quality and shortened reaction time

Inactive Publication Date: 2018-07-03
YANGTZE UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome above-mentioned technical deficiencies, propose a kind of preparation method of neodymium calcium aluminate, solve the technical problem of high preparation temperature and long preparation time of neodymium calcium aluminate in the prior art

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  • Preparation method of neodymium calcium aluminate
  • Preparation method of neodymium calcium aluminate
  • Preparation method of neodymium calcium aluminate

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preparation example Construction

[0012] The present embodiment provides a kind of preparation method of neodymium calcium aluminate, comprises the following steps:

[0013] (1) Press CaNdAlO 4 The stoichiometric ratio of the metal elements in the medium, respectively weighed the compounds containing Ca, Nd, Al as raw materials, prepared to contain Ca 2+ 、Nd 3+ and Al 3+ The mixed solution of nitrate; Add organic fuel and complexing agent to the above mixed solution of nitrate, the organic fuel is at least one of urea, citric acid and glycine, and the Ca in the mixed solution of organic fuel and nitrate 2+ The molar ratio of the organic fuel is 1-6:1. If the amount of organic fuel added is too much, the purity of the product will be affected; if the amount of organic fuel added is too small, the fuel will be insufficient and the reaction will be insufficient; the complexing agent is B Glycol and / or polyethylene glycol, and the molar ratio of complexing agent and organic fuel is 4:1, if the adding amount of ...

Embodiment 1

[0021] The present embodiment provides a kind of preparation method of neodymium calcium aluminate, comprises the following steps:

[0022] (1) Weigh 1 mol of Ca(NO 3 ) 2 4H 2 O and 1mol of Al(NO 3 ) 3 9H 2 O was added to No. 1 beaker, and deionized water was added to the beaker and stirred to completely dissolve the contents in the beaker; weigh 0.5mol of Nd 2 o 3 Add to No. 2 beaker, then add excess concentrated nitric acid, wait for Nd 2 o 3 After complete dissolution, Nd(NO 3 ) 3 Solution, stir and mix the solutions in No. 1 beaker and No. 2 beaker evenly to obtain Ca 2+ 、Nd 3+ and Al 3+ nitrate mixed solution; then weigh 3mol urea and 12mol ethylene glycol and add the above mixed solution, stir and mix evenly for subsequent use;

[0023] (2) Turn on the resistance furnace and set the temperature to 800°C. After the resistance furnace heats up to 800°C, keep the temperature constant, then place the mixed solution in step (1) in a porcelain crucible and put it ...

Embodiment 2

[0026] The same raw materials and method as in Example 1 were used to prepare neodymium calcium aluminate, the difference being that the combustion temperature of the mixed liquid was 900°C.

[0027] The XRD of the synthetic product of this embodiment sees figure 1 ,figure 1 In , the material prepared in this example is marked as "900°C". Control CaNdAlO 4 It can be seen from the PDF card (PDF#81-0743) that the product is mainly CaNdAlO 4 , but contains a large number of second-phase crystals.

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Abstract

The invention discloses a preparation method of neodymium calcium aluminate. The preparation method comprises the following steps: in stoichiometric ratio of metal elements in CaNdAlO4, respectively weighing compounds containing Ca, Nd and Al as raw materials, preparing into mixed solution of nitrates containing Ca<2+>, Nd<3+> and Al<3+>, adding organic fuel and a complexing agent into the mixed solution of nitrates, wherein molar ratio of the organic fuel to Ca<2+> in the mixed solution of nitrates is (1-6):1, uniformly mixing, then igniting the mixed solution at the temperature of 800-900 DEG C, and obtaining neodymium calcium aluminate after the mixed solution is burned up. According to the technical scheme, neodymium calcium aluminate is synthesized at a certain temperature and a certain raw material ratio, so that the problems of high synthesis temperature and long preparation time are solved; the complexing agent is added and can be complexed with metal ions to form an intermediate, temperature for synthesizing neodymium calcium aluminate is lowered, the complexing agent can enable the raw materials to be uniformly mixed and can be expanded in a burning process, a loose product is produced, and the phenomenon that the product is agglomerated and caked can be avoided.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric material preparation, and more specifically relates to a preparation method of neodymium calcium aluminate. Background technique [0002] Neodymium calcium aluminate (CaNdAlO 4 ) is ABCO 4 type crystal, belonging to K 2 NiF 4 structure. K 2 NiF 4 type crystal structure of MRAlO 4 (M=Sr, Ca; R=La, Sm, Y, Nd) system ceramics is a material with excellent microwave dielectric properties, and its generally good performance indicators mainly include: suitable dielectric constant, extremely low Dielectric loss and resonant frequency temperature coefficient that can be tuned to zero. And because it does not contain noble metal elements such as Nb and Ta, and China is rich in rare earth elements, its cost is generally lower than some previous commercial ceramic systems such as Ba-based composite perovskite, including Ba(Mg 1 / 3 Ta 2 / 3 )O 3 , Ba(Zn 1 / 3 Ta 2 / 3 )O 3 , Ba(Zn 1 / 3 Nb ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/34C01P2002/72C01P2006/80
Inventor 朱德生周明芹
Owner YANGTZE UNIVERSITY
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