 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 2 | 1/1 | 返回列表 |
| 查看: 531 | 回復(fù): 1 | |||
| 【懸賞金幣】回答本帖問(wèn)題，作者qdbxj將贈(zèng)送您 100 個(gè)金幣 | |||
qdbxj木蟲(chóng) (小有名氣)
|
[求助]
三元素占有率無(wú)序精修還可以用fvar命令嗎 已有1人參與
|
||
|
請(qǐng)教一下各位老師，書(shū)上只有兩種原子占有率無(wú)序的精修方法。 fvar xx xx part 1 xxxx part 2 xxxx part 0 如果我在同一位置存在三種原子的無(wú)序，還可以用fvar或者類似的方法解決嗎 |
回復(fù)此樓» 猜你喜歡
海南師范大學(xué)招收化學(xué)博士（光電功能材料課題組招收博士研究生）
已經(jīng)有11人回復(fù)
-
求助幾個(gè)團(tuán)簇的cif
已經(jīng)有0人回復(fù)
-
無(wú)機(jī)化學(xué)論文潤(rùn)色/翻譯怎么收費(fèi)?
已經(jīng)有97人回復(fù)
-
急求該反應(yīng)的詳細(xì)機(jī)理
已經(jīng)有5人回復(fù)
-
【Ei | Scopus 雙檢索】2026年智能交通與未來(lái)出行國(guó)際會(huì)議（CSTFM 2026）
已經(jīng)有0人回復(fù)
-
【EI|Scopus 雙檢索】2026年第六屆機(jī)器人與人工智能國(guó)際會(huì)議（JCRAI 2026）
已經(jīng)有0人回復(fù)
-
zotero的advanced material模板沒(méi)有更新，有人有新版的cls文件嗎
已經(jīng)有2人回復(fù)
-
【高校聯(lián)合舉辦】2026年第五屆服務(wù)機(jī)器人國(guó)際會(huì)議（ICoSR 2026）
已經(jīng)有0人回復(fù)
-
深圳大學(xué)化學(xué)與環(huán)境工程學(xué)院超分子團(tuán)隊(duì)招收2026級(jí)申請(qǐng)-考核制博士生
已經(jīng)有8人回復(fù)
-
中南大學(xué)化學(xué)化工學(xué)院易小藝教授課題組招收2026級(jí)博士研究生（第二輪）
已經(jīng)有0人回復(fù)
雪國(guó)郭靖
金蟲(chóng) (小有名氣)
- 應(yīng)助: 40 (小學(xué)生)
- 金幣: 3653.6
- 紅花: 8
- 帖子: 222
- 在線: 119.4小時(shí)
- 蟲(chóng)號(hào): 1435077
- 注冊(cè): 2011-10-10
- 性別: GG
- 專業(yè): 物理有機(jī)化學(xué)
【答案】應(yīng)助回帖
感謝參與，應(yīng)助指數(shù) +1
|
用上SUMP命令就行了，下面是教程復(fù)制過(guò)來(lái)的 SUMP c sigma c1 m1 c2 m2 ... The linear restraint: c = c1*fv(m1) + c2*fv(m2) + ... is applied to the specified free variables. This enables more than two atoms to be assigned to a particular site, with the sum of site occupation factors restrained to be a constant. It also enables linear relations to be imposed between distances used on DFIX restraints, for example to restrain a group of atoms to be collinear. sigma is the effective standard deviation. By way of example, assume that a special position on a four-fold axis is occupied by a mixture of sodium, calcium, aluminium and potassium cations so that the average charge is +2 and the site is fully occupied. The necessary restraints and constraints could be set up as follows (the program will take care of the special position constraints on the coordinates and Uij of course): SUMP 1.0 0.01 1.0 2 1.0 3 1.0 4 1.0 5 ! site fully occupied SUMP 2.0 0.01 1.0 2 2.0 3 3.0 4 1.0 5 ! mean charge = +2 EXYZ Na1 Ca1 Al1 K1 ! common x, y and z EADP Na1 Ca1 Al1 K1 ! common U or Uij FVAR ... 0.20 0.30 0.35 0.15 ! starting values for free variables Na1 ... ... ... ... 20.25 ... ! 0.25*fv(2) Ca1 ... ... ... ... 30.25 ... ! 0.25*fv(3) Al1 ... ... ... ... 40.25 ... ! 0.25*fv(4) K1 ... ... ... ... 50.25 ... ! 0.25*fv(5) This particular refinement would probably still be rather unstable, but the situation could be improved considerably by adding weak SUMP restraints for the elemental analysis. Such SUMP restraints may be used when elements are distributed over several sites in minerals so that the elemental composition corresponds (within suitable standard deviations) to an experimental chemical analysis. SUMP may also be applied to EXTI and BASF parameters, including parameters used to describe twinning (TWIN). The parameters are counted in the order overall scale and free variables, BASF, thenEXTI. These virtual free variable numbers are the same as the parameter numbers printed in the .lst file for each refinement cycle. |
2樓2020-09-01 09:13:17
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 qdbxj 的主題更新
| 2 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] A區(qū)一本交叉課題組，低分調(diào)劑，招收機(jī)械電子信息通信等交叉方向 +28 | lisimayy 2026-03-04 | 40/2000 |
|
|---|---|---|---|---|
|
|
[考研] 085602高分子方向求調(diào)劑 +7 | tlgudy 2026-03-04 | 7/350 |
|
|
|
[考研] 材料與化工354調(diào)劑 +4 | Lucy-xiao 2026-03-06 | 7/350 |
|
|
[考研] 303求調(diào)劑 +4 | forgman95 2026-03-05 | 6/300 |
|
|
|
[考研] 085600材料與化工，一志愿廣州985，求調(diào)劑 +9 | qqyyaill 2026-03-05 | 9/450 |
|
|
|
[考研] 復(fù)試調(diào)劑 +5 | 呼呼？~+123456 2026-03-05 | 5/250 |
|
|
|
[考研] 一志愿東北大學(xué)080500，英一數(shù)二343分求調(diào)劑 +5 | Seele_v5 2026-03-04 | 5/250 |
|
|
|
[考研] 0856材料求調(diào)劑 +17 | hyf hyf hyf 2026-02-28 | 18/900 |
|
|
|
[考研] 環(huán)境調(diào)劑 +7 | 柒槿levana 2026-03-01 | 7/350 |
|
|
|
[考研] 一志愿314求調(diào)劑 +7 | 202111120625 2026-03-03 | 7/350 |
|
|
|
[考研] 291求調(diào)劑 +3 | 咕嚕咕嚕123123 2026-03-02 | 4/200 |
|
|
|
[考研] 298求調(diào)劑一志愿中海洋 +3 | lour. 2026-03-03 | 3/150 |
|
|
|
[考研] 267求調(diào)劑 +6 | 釣魚(yú)佬as 2026-03-02 | 6/300 |
|
|
|
[考研] 化學(xué)0703求調(diào)劑 學(xué)碩 理/工科均可 總分279 +3 | 1一11 2026-03-03 | 5/250 |
|
|
|
[考研] 26考研報(bào)考西工大材料308分求調(diào)劑 +4 | weizhong123 2026-03-01 | 5/250 |
|
|
|
[考研] 338求調(diào)劑 +5 | 18162027187 2026-03-02 | 6/300 |
|
|
|
[考研] 0854復(fù)試調(diào)劑 276 +5 | wmm9 2026-03-01 | 7/350 |
|
|
|
[考研] 285求調(diào)劑 +9 | 滿頭大汗的學(xué)生 2026-02-28 | 9/450 |
|
|
|
[考研] 一志愿華南理工大學(xué)材料與化工326分，求調(diào)劑 +3 | wujinrui1 2026-02-28 | 3/150 |
|
|
|
[考研]
 尋找調(diào)劑
+4
|
LYidhsjabdj 2026-02-28 | 4/200 |
|