Sadegh Mojahedfar

42 Questions 14 Answers 0 Followers

Questions related from Sadegh Mojahedfar

About transparent ceramics?

thank you 1. Why uniformity of grains is important to have transparent ceramics?and How is effect uniformity of grains on increasing transparency of ceramics?then What can we do for have final...

02 February 2017 7,270 0 View

Why we need to cubic structure to produce transparent ceramic? and Is cubic structure concern to grain shape or unit cell?

if that is related to grain shape Why in some source implied "a lot of transparent have cubic structure but in some articles produce transparent ceramic with monoclinic or hexagonal structure is...

01 January 2017 9,126 3 View

Hello , How many roues are there for chemical synthesis ?

thank u

11 November 2016 5,467 0 View

Hi, How can we compeletely define synthesis ?

tnx

11 November 2016 6,850 0 View

I will used solid state reaction (SSR) for synthesis ZnWO4 , is it important the particles starting soluble in solvant?

I'll synthesis ZnWO4 from the powders ZnO and WO3 by used of SSR, but seems that the particles ZnO and WO3 in Water and ethanol are insoluble. Thank you

10 October 2016 669 3 View

Is there valid sources for solubility material in solvants (especially water and ethanol) ?

I'm looking for values of solubility ZnO and WO3 in water and ethanol , How can help me ? thank you

10 October 2016 3,316 2 View

Is it any different between ceramic and polycrystal ?

tnx

10 October 2016 301 0 View

Who can introduce to me a software for calculate melting point a composition with some impurities ?

tank you

08 August 2016 9,566 1 View

How can I calculate melting point for noncrystalline ceramic ??

for ZnWO4 with nano particle . which kind formula do I use? I know one formula for single metalic element like T=T0(1-(constant/D)) but for these kind material I didn't see any thing. tnx

05 May 2016 2,219 5 View

I can't understand as well as what's the grain in crystal ?

Is there any different between grain and crystallite and single crystal words ? and with regarded figure below for a polycrystalline , how many grain are there ?

05 May 2016 4,313 9 View

I have synthesized a ceramic material and then sintered it and we used that as an scintillation but it work such as a shielding ?

my material is a polycrystallian ceramic .

05 May 2016 3,031 0 View

How can we calculate material's density ( except Archimedes' way , ) ?

My means is by use of which kind analysis can we do that ? I haven't its volume . tnx

05 May 2016 4,115 1 View

By use of which kind of vehicle I can determine my ceramic powder's melting point ?

its melting point is about 1100-1200 Celsius , but i need to its accurate melting point . tnx

05 May 2016 9,578 7 View

How can I find my synthesis powder's center emission , ?

by which kind analysis ? I want to know when my powder is excited and now it give emission spectra where is center emission . tnx

05 May 2016 9,652 1 View

DO we can make single crystal with synthesis method ?

Is it true that for have a single crystal always we use of The Czochralski and Bridgman method and when we use of synthesis we arrive to poly crystal ?

05 May 2016 9,493 3 View

Are there any different between soak time and dwell time in sintering processe ?

tnx

05 May 2016 6,478 0 View

How can I find the soak time for my sample's sintering ?

tnx

05 May 2016 7,596 0 View

Packing factor for Bcc structure can calculated and its value is 0.68 , Is it for what ?

for a maximum possible packing ?

05 May 2016 5,420 0 View

Do we have any metallic scintillator ?

tnx

05 May 2016 5,319 0 View

Why XRD analysis just use for crystal's distiguish?

why it can't analysis other materials?

04 April 2016 2,956 9 View

What's meaning of the maximum intensity reflect in XRD analysis for a crystal ?

and what kind of application has that plane ?

04 April 2016 4,996 9 View

How can I calculate FWHM for this graph at 2theta=30.09949297 degree (in below graph)?

That's a graph for Intensity-2Theta .

04 April 2016 438 8 View

If sintering a synthesized powder increases grain size ?

if the answer is yes , why ?

04 April 2016 7,246 3 View

How we determine sintering's condition (temperatures and soak- time) for growth material ?

How we determine sintering's condition (temperatures and soak- time) for growth material, especially for nanopolycrystal or general state?

04 April 2016 3,855 2 View

In Bragg's law , why we need to construction interface for material analys ?

tnx about your answer

04 April 2016 1,974 1 View

By which kind analysis we can arrive to material's spectral?

for sintered powder

04 April 2016 5,384 0 View

What's different between the starting materials and precursors in synthesis ?

tnx

04 April 2016 3,307 0 View

In synthesid for example ZnWO4 in different we starts with different starting material , after prepration this material ...?

, if we can't distinguish routes produce every kind ? if we arrive to same powders in material's pure for example in analysis for sintering their pills , Can we give same sinterring's condition...

04 April 2016 8,651 0 View

How can we sintering a nano polycrystall ceramic sceintillator ?

my means nano grain ,

04 April 2016 3,372 0 View

Are there any different between a single phase powder in comparison to when we sintering it and arrive to a single phase powder again ?

What kinds reason are there that we sintering or calcination a powder ?

04 April 2016 4,412 1 View

I synthesis a powder ZnWO4 , then I'll sintere that for sceintillators applications . I don't know how i choice my sintering's condition?

how can I Choice that (according to what conditions)? my powder's size is about 60nm .

04 April 2016 5,714 3 View

What kind analyes is good for take a photo than powder ?

How many are there ?

04 April 2016 6,237 0 View

What's meaning of the soak time in sintering process?

sintering soak time,

04 April 2016 4,477 1 View

By which kind analysis we can arrive to mass unit cell ?

or arrive to unit cell's atoms?

04 April 2016 3,549 2 View

In the Sherrer formula for calculation grain size , How must I choose the K constant for my work ?

for ZnWO4

04 April 2016 699 1 View

What's meaning of the chelated in synthesis ?

for example in this sentences : several metal ions in a solution could be first chelated to form metal complexes .

04 April 2016 7,410 2 View

What's concept of this sentence : Sintering are carried out in air at constant heating rate 3 ◦C\min, at 900 ◦C and 1000 ◦C temperatures for 24 h?

My means is that : this rate is for heating or for cooling ? which one is more important?

04 April 2016 5,845 0 View

I synthesed a ceramic powder ZnWO4 from starting material ZnO and WO3 , How can I phase analysis that ?

I'll think , I have to analysis equilibrium diagram for ZnO-WO3 , But How?

04 April 2016 5,304 4 View

What's steps make a sceintillator ceramic pollycrystallian?

for ceramics oxide ,

04 April 2016 6,603 0 View

I can't understand construction interface condition ?

tnx

04 April 2016 3,382 4 View

I can't understand construction interface condition ?

who can explain it ?

04 April 2016 1,873 3 View

I need a reference for growth polycrystal?

i'll growth CdWO4 for proje master of science . and i don;t no more thing about growth's circumstances ?

10 October 2015 4,071 0 View